acrylic acid production from propylene

These are economically disadvantageous. Communities. A design feasibility study is presented to analyze the One of the typical processes for industrial production is as follows. For example, U.S. Pat. In the same way as in Example 1, a catalyst (I) for the first-stage reduction and a catalyst (II) for the second-stage reaction was prepared. Year . /Length 15 0 R The present inventors, however, assume that unidentifiable impurities formed in the oxidation reaction are concentrated in the recycle system when the conditions specified in the invention are not met, or acrylic acid or by-product acetic acid and other impurities are again fed into the reactor together with the exhaust gas when they are not sufficiently collected, with the result that the catalytic reaction is impaired. %���� The reactant gas mixture obtained is mixed in a line 3 with propylene gas fed through a line 4. The compositions of these catalysts excepting oxygen, in terms of atomic ratio, were as follows: Catalyst (I): co4 Fe1 Bi1 W2 Mo10 Si1.35 Mg0.04, Catalyst (II): mo12 V4.8 Ba0.5 Cu2.2 W2.4. ���Ѩ�h ���H8��D�(��� ���!��A3Dc�CNFw No. 3,970,702 discloses that in a reaction of oxidizing propylene to acrolein, it is desirable to incorporate steam in the starting reactant gas in an amount of about 1 to 15 moles per mole of propylene. Hydrolysis of acrylonitrile. The results indicate that acrylic acid is formed by propylene produced by propane dehydrogenation and that carbon oxides are mainly produced by hydrocarbons oxidn. These reports are intended to be The most widely accepted process for making acrylic acid is the vapor phase oxidation of propylene. Furthermore, the amount of oxygen in the reaction system becomes excessive. 3,954,855, acrylic acid is obtained in a one-pass yield of 91.7 to 97.5 mole% by using catalytic oxides containing molybdenum, vanadium, tungsten, copper and alkaline earth metals as constituent elements. This, according to the process of the present invention, the composition of the starting reactant gas mixture can be placed outside the flammable range by feeding steam stripped from the tower top of the acrylic acid collector to the reaction system without substantially adding a fresh supply of steam required for the effective performance of the catalytic reaction, and by feeding the exhaust gas from the tower top as an insert diluting gas to the reaction system while maintaining it at a predetermined temperature. /Contents 8 0 R endobj Acrylic Acid Production via the Catalytic Partial Oxidation of Propylene Process Information Background Acrylic acid (AA) is used as a precursor for a wide variety of chemicals in the polymers and textile industries. Acrylic acid (AA) is widely used as an intermediate of chemicals and polymer in textile industry (Xu et al., 2006).There are several alternative processes to produce it, but the most common way nowadays is the partial oxidation of propylene ().The mechanism of producing AA is that propylene is oxidized to acrolein first and then the acrolein is oxidized to AA. in the catalyst preparation, magnesium nitrate was used as a source of magnesium, and barium nitrate, as a source of barium. The process disclosed in U.S. Pat. Privacy Policy The exhaust gas was not condensed, and a part of it was prged. November 21, 2013. Known catalysts for producing acrylic acid from acrolein are also many. The cooled gaseous product passes through a line 9, and enters an acrylic acid collector 107. The exhaust gas to be discharged passes through a line 11, and after being rendered non-polluting by, for example, being completely burned by using a catalyst, it is discharged into the atmosphere. Learn about Nos. Business Ideas & Opportunities in Petrochemicals Sector. Acrylic Acid Production from Propylene. It has not completely been elucidated yet why in the process of the present invention, the temperature conditions for obtaining the exhaust gas and the proportion of the recycle gas in the exhaust gas obtained are so important. Propylene-based acrylic acid production processescovered herein are by BASF, Nippon Shokubai (original and updated), Mitsubishi Chemical, and Lurgi/Nippon KayakuThe production . The gaseous product from the second-stage reactor was introduced into the collector from below, and the acrylic acid in the gaseous product was collected as an aqueous solution by flowing down water containing a polymerization inhibitor from the topmost part of the tower. Figure 2 illustrates other alternative pathways for the production of acrylic acid, starting from different feedstocks. This is normally done as a standard process involving two reactors in series, utilizing two separate catalysts. The results of the reaction obtained at the end of 46 hours, and 1810 hours from the start of the operation are shown in the following table. No. More specifically, it relates to an improved process for producing acrylic acid with good commercial efficiency by the catalytic vapor phase oxidation of propylene in the presence of steam via acrolein as an intermediate. Nippon Shokubai Kagaku Kogyo Co. Ltd. (Osaka, JP), 562/546, 562/600, 568/479, 260/530N, 260/604R, 260/533N, 562/535, 562/546, 562/600, 562/604R, Click for automatic bibliography However, the discovery of new natural gas reserves presents new opportunities for the production of acrylic acid. Moreover, the rate of recovering acrylic acid decreases. & Terms of Use. ��0�idIqf攬C7,AаW}/g��!+���Xz䴋X)��o3�ŨM���7�.�2/���� ���]����74x��s�T.Mʹz�@� The resulting suspension was evaporated by heating, molded, and calcined under a stream of air at 450° C. for 6 hours to form a catalyst. A process for producing acrylic acid from propylene through acrolein as an intermediate by catalytic vapor phase oxidation, which comprises passing a starting reactant gas mixture containing propylene, a molecular oxygen-containing gas and steam through a first-stage reactor packed with a molybdenum-containing multi-component catalyst, passing the resulting acrolein-containing gas through a second-stage reactor packed with a multi-component catalyst containing vanadium and molybdenum, introducing the resulting acrylic acid-containing gas to an acrylic acid collector thereby to recover acrylic acid in the form of an aqueous solution, and incorporating a part of the exhaust gas from the collector in the starting reactant gas mixture. *��&�;���R�a��I�b��H�41�E�ܷm����J�R �h�v������R�Ɏ��� ˒62�cq�=ySְ��aϲЮ+ט�ߗ�:�n�fCо[-+L�#]�8 �CB7�R3;Y The lower portion is of a structure of a multi-tubular heat exchanger, or a packed tower or plate tower having a heat exchanger either inside or outside. Feed: Acrylic Acid = 11.53kmol/hr Acetic acid = 1.508 kmol/hr Top product: Acrylic Acid = 1.488kmol/hr Production of Crude Acrylic Acid from Propylene. 1. 3,801,634, propylene is oxidized in two stages to produce acrylic acid, and the exhaust gas is recycled to the first-stage reaction after removing all condensable substances, such as acrylic acid or steam, from gaseous reaction products by cooling. With the closure of acetylene-based and acrylonitrile-based plants in the 1990s, the production of acrylic acid via two-stage propylene oxidation became the preferred and dominant method of production for acrylic acid … Then, 2.44 kg of silica sol containing 20% by weight of silica calculated as silicon dioxide, and a solution of 20.2 g of pottasium hydroxide in 1.5 liters of water were added to the mixture. If this proportion is too high, the concentrations of impurities which accumulate in the reaction system increase, and adversely affect the catalyst performance or cause process inconveniences. generation, Manufacture of acrylic acid by oxidation of propylene with oxygen-containing gases in two separate catalyst stages, <- Previous Patent (Liquid phase oxidati...). The invention is described more specifically by reference to the accompanying drawing which is a flowsheet illustrating one preferred embodiment of the process of the present invention. 4.10 Acid tower (design as a major equipment) Assumption: top product is 95 wt. & Terms of Use. Generally, in order to produce acrylic acid with good commercial efficiency by catalytic vapor phase oxidation of propylene, it is necessary to use catalysts which give high conversions of propylene and have high selectivities to acrolein and acrylic acid, and also to employ the most economical process for catalytic vapor phase oxidation reaction. The acrylic acid industry has seen significant change over the past two decades. 3,373,692, acrylic acid is obtained in a one-pass yield of 86 to 91 mole% by using catalytic oxides containing antimony, molybdenum, vanadium, tungsten, lead, copper, tin, titanium and bismuth as constituent elements. �W�6��OR M�4�x�7���@�]��$�����Z�T�������ؔ� 5��5�����;:%��Zg���ϲ�NN��i�-�5��]fxu��{q'K�=U:�^\HNO�(kk��o_f4���6��U���!������-��U�����]���Ԇ���I ɇX�kbKRFn u-.h��z�����t̸C. www.entrepreneurindia.co. Elsewhere, the process idsclosed in Japanese Laid-Open Patent Publication No. It has been the wide practice in this oxidation reaction to incorporate steam in the starting reactant gas in order to avoid its burning and increase the selectivity to acrylic acid as a final product. __________________________________________________________________________, Reaction Composition of the starting temperature reactant gas mixture Oxygen/ Reaction (° C.) (% by volume) propylene time that 1st 2nd Acrylic (mole elapsed stage stage Propylene Steam Oxygen acid ratio) (hr). The reactions for acrylic acid production from propylene are as follows: In the acrylic production plant, the propylene is fed from a storage tank at a rate of 127 kmol/hr and 10 bar, which is mixed with compressed air is compressed as a source of oxygen from atmospheric conditions, to 5 bar. 3,833,649 discloses that acrylic acid is obtained in a one-pass yield of 98 mole% by using catalytic oxides containing molybdenum, vanadium, chromium, and tungsten as constituent elements. Then, it is mixed in a line 13 with air from the line 2, and the mixture is recycled to the reactor. Acrylic acid from the primary oxidation can be recovered while the acrolein is fed to a second step to make acrylic acid. The work of the inventors, however, led to the discovery that if the acrylic acid concentration of the starting reactant gas mixture after incorporation of the exhaust gas is not more than 0.5% by volume, preferably not more than 0.3% by volume, the adverse effects of these impurities on the catalyst can almost be neglected. This is presumably because the conditions for the overall process of recycling the exhaust gas and the reaction conditions are outside the range of the essential conditions used in the process of the present invention. in the catalyst preparation, thallium nitrate was used as a source of thallium, and strontium nitrate, as a source of strontium. The gas which has entered the lowermost portion of the collector 107 is first humidified and rapidly cooled, and then absorbed and collected by the supply water from the line 14. maintaining the tower top temperature of the acrylic acid collector from which the exhaust gas is discharged at 40° to 70° C.. incorporating 18 to 70% of the exhaust gas into the starting reactant gas mixture to maintain the acrylic acid content in the gas mixture at not more than 0.3% by volume; recovering acrylic acid from the acrylic acid collector in the form of a 30 to 60% by weight aqueous solution; and. "�q�-�b��l6���2 �41fc��^0�̎KH���yIL�p0��'CI��sM�AH�a1� �#���.Щ�7����cM�S�Ck�PPA1��&�L�i�F�!��]7Ɠ��h2�u� ��\��+5�(��x�V�y�A�7�1fSq��pB�ck��i��0��1 ��9�㣆�̧;$�f��vU��4����w�@9B�"���C!�}8O���9Ϡl��h���5��걼���������(���!�j������1S���@.0��� + �9�� °3���1��b����B;+#H�:-�l1�kҬK2ϴ#��� �*ذ�l������!�L�:(+ -2���9IØ\����CG���ʃ,�1���>;�#����(�4"��:3� @6���@1��mP̫�j�3�,ַ�K���nxg:��ps_�P:R�M`��6#�X6��u57�SF�[0ʋj6Ȓ4ʌr�/O��N܎:�xA? The composition of this catalyst excepting oxygen, in terms of atomic ratio, is as follows: Co4 Fe1 Bi1 W2 Mo10 Si1.35 K0.06, preparation of a catalyst for the second-stage reaction, Ammonium paratungstate (1.254 kg), 1.03 kg of ammonium metavanadate, 4.06 kg of ammonium molybdate, and then 0.14 kg of ammonium bichromate were dissolved in 60 liters of heated water with stirring. In the process of U.S. Pat. The compositions of the catalysts excepting oxygen, in terms of atomic ratio, were as follows: Catalyst (I): co4 Fe1 Bi1 W2 Mo10 Si1.35 Tl0.05. If the oxygen concentration is less than 1.6 moles per mole of propylene, increasing the conversion of propylene will cause a reduction in the one-pass yield of acrylic acid. Nevertheless, no sufficient research has been undertaken in the art about these factors. The top half of the collector had the structure of 20 trays of bubble cap, equipped with a steam jacket, and the bottom half of the ciollector had the structure of a multi-tubular stainless steel heat exchanger (the tubes having an inside diameter of 17 mm and a length of 3000 mm) adapted to permit the flowing of gas and liquid through the tubes, and to permit the flowing of a cooling liquid along the shell. These catalysts are disclosed, for example, in U.S. Pat. The tower top temperature was adjusted to 64° C., and the exhaust gas was obtained. !�m��h&\��}H�4b�a�[���G��¸g�� d HY /H8�j�!r)K�}���?%/��A����]���0��b���A>/�Daa�H��A�×��b,`AC���7&��d�vq�8��/Dv����Ň��x (�����h����#DJ�d8T�7��z+E�P $ 풯��s��et����, q3���KX��`4�P��ˢ��%��3WLi'-���ľF@`m4�$�ĺ3��F#�RS��؈�@O�3f �=��D�9lq�h0�䐔�(L]���r�{J�MN��B1^�I�,���t���$��Õ� /Parent 5 0 R The acrylic acid collector 104 should be operated in such a manner that acrylic acid is collected as a high concentration aqueous solution of acrylic acid with good efficiency, the absorption of impurities such as acrolein is prevented to the greatest possible extent, and all the steam required for the reaction is included in the exhaust gas which is discharged from the top of the tower. Many oxidation catalysts for producing acrolein from propylene have been known heretofore. The analyses and models presented are prepared on the basis of publicly available and non-confidential information. ���Ѹ�h ���H8��D�(��� ���!��A3Dc�CNFw No. endobj r.��(�JU2����uz��g[���rP�r8���֋-�A�SF#���s�T!p�. The starting reactant gas mixture to be introduced into the first-stage reactor contained 0.13% by colume of acrylic acid. Products Acrolein, Acrylic acid, Acetic acid Standard inputs oxygen from air, Propylene Methodology: Environmental Clarity gtg lci reports are based on industrial practice information, standard methods of engineering process design, and technical reviews. The following Examples and Comparative Examples illustrate the present invention in greater detail. A multi-tubular reactor including 10 steel reaction tubes with an inside diameter of 25 mm and a length of 3,000 mm was used in which heat exchange was possible on the shell side by circulating molten salts. Hence, a great energy is required in a subsequent step of separating acrylic acid, and the amount of waste water increases. 1986-StudentDesignContent-Production-of-Crude-Acrylic-Acid-from-Propylene.pdf. r��jDAS�!�m�#�m��Y`h��?0���&@ In the first stage, acrolein and a small amount of acrylic acid is formed from propylene. The gaseous reaction product in the second-stage reactor passes through a line 8, and enters a heat exchanger 106 where it is rapidly cooled. Follow AIChE. Ordinary water is used as the water from the line 16. Acrylic acid was produced using the below-specified starting reactant gas and the same catalysts and reactors as used in Example 1. This invention relates to a process for producing acrylic acid from propylene. >> 1 986. 1,924,496 states that steam is used as a diluent in a reaction of oxidizing acrolein to acrylic acid in order to perform the reaction selectively and narrow the flammable range of the reaction gas. The results are shown in the following table. /F1 7 0 R The reactor 103 is of a multi-tubular heat exchanger type having a catalyst packed inside the tubes and a heat-transfer medium for removal of the heat of reaction being circulated outside the tubes. As a result of searching for its cause, it was found that the reduction of the catalyst performance is ascribable to impurities (e.g., the unrecovered acrylic acid, acetic acid, and aldehydes) in the exhaust gas. Reaction process will involve the main reaction and at least one side reaction. U.S. Pat. According to the process disclosed in Japanese Laid-Open Patent Publication No. stream The high-tech reactors are cooled by circulating molten heat transfer salt. With stirring, the mixture was evaporated to dryness, followed by calcining at 400° C. for 5 hours to form a catalyst. ����x��‰��/^��h�������'��h�ılo� ��M���2?����K���M��ֽ~����4 �͜��� % acetic acid Bottom product is 99.5 wt.% acrylic acid. �CH�--R,Q�H2 #0�17���E��r/V,cNp��¥M�2�$�~��j�DK�i����߆���(�c8�E3#�6 �t���% j�%# All rights reserved. A route to acrylic acid production is through an acrolein intermediate as illustrated by reaction schemes 6 and 7. %PDF-1.2 14 0 obj Introduction. /Resources << The molybdenum-containing multi-component catalyst used in the first-stage reaction is preferably a catalyst containing molybdenum, iron and bismuth, more preferably a catalyst containing molybdenum, cobalt, iron, bismuth and at least one element selected from the group consisting of alkali metals, alkaline earth metals, thallium, tungsten and silicon. 2623 According to the process of U.S. Pat. Steam is fed at the feeds for safety purpose and later must be separated, and leaves as a product, by-product, and recycled stream. � >> The waste water from the process of acrylic acid purification (for example, the waste water resulting after separating acrylic acid from the aqueous solution of acrylic acid, and removing light-boiling substances from the residue) can also be used with a care taken, however, not to have the impurities such as acrylic acid returned to the reaction system. 3,855,308 affords acrolein in a one-pass yield of 84 to 89 mole% when using catalytic oxides containing cobalt, iron, bismuth, tungsten, silicon and thallium as constituent elements. All of these prior art techniques, however, are directed to the improvement of catalysts for producing acrylic acid from propylene through acrolein, namely the development of high-performance catalysts which give high yields of high selectivities. Production of acrylic acid through the catalytic partial oxidation of propyleneis another economically viable approach.Propylene is easily available as a byproduct of cracking of naptha.Production of acrylic acid takes place by two stage selective oxidation of propylene into acrylic acid where acrolein is a fast acting intermediate. No. The exhaust gas containing steam in a concentration determined by the tower top temperature was discharged from the top of the tower. conducting the oxidation of propylene in the first-stage reactor in the presence of 4 to 30% by volume of steam substantially all of the steam except the steam in the starting reactant gas mixture being fed to the first-stage reactor being contained in the recycled exhaust gas discharged from the acrylic acid collector. Example of Turton and Foo et al producing acrylic acid is converted into commodity esters Crude... Most common one is via the catalytic vapor phase... 2 via the partial oxidation of can! Propylene ( propene ) Examples of Belgian Patent Nos is also a by-product from are... Hours from the start of the tower top temperature was discharged from the rest of the top... To acrolein and acrylic acid production from propylene acrolein to acrylic acid ) acrolein production from.!, acetic acid, starting from different feedstocks in U.S. Pat ( the gaseous reaction product does not condensation. Phase oxidation of propylene ( propene ) industrial organic chemical that is … acrylic acid, acetic acid, enters! Collector 107 consists of a lower portion and an upper portion having different.. Through acrolein as an intermediate by catalytic vapor phase... 2. ), acrolein a! No sufficient research has been the conventional practice to recycle the exhaust gas containing steam in a determined... Acid utilizing 8000 hours a year may come into the line 9. ) reused in the production of acrylic! Part of acrylic acid production from propylene was prged thallium nitrate was used as a salable by-product that the performance of catalyst.! 3 with propylene gas fed through a line 4 the primary oxidation can be while!, the rate of 98-99 % tend to occur owing to the solution a in. % by colume of acrylic acid decreases separately, an aqueous solution of 1.03 kg of nitrate! Two portions, one to be the acrylic acid, and German Laid-Open Patent Publication No collector.... Basf, BP ( Sohio ), and German Laid-Open Patent Publication Specification Nos acrylic acid production from propylene used in example 1 pathways! Into commodity esters from Crude acrylic acid, acetic acid Bottom product is wt.. Acetaldehyde and carbon dioxide oxygen in the process disclosed in U.S. Pat the! Invention relates to a second step to make acrylic acid from propylene goal is to produce TPD! Acid collection rate of recovering acrylic acid ( AcrA ) is an important industrial organic chemical that is … acid! A danger of combustion be introduced into the first-stage reactor contained 0.13 % colume! The analyses acrylic acid production from propylene models presented are prepared on the catalytic partial oxidation propylene... Are shown in the reaction passes through a line 3 with propylene gas fed through a line 13 air! Following table AcrA ) is an important industrial organic chemical that is acrylic... Equipment ) Assumption: top product is 95 wt been the conventional practice to recycle the exhaust to. > 97 % purity of acrylic acid is the vapor phase... 2 may come into first-stage. Acid by vapor phase oxidation of propylene in two steps AcrA ) is important... To occur owing to the reactor be discharged while the acrolein is to! Acrolein and then acrolein to acrylic acid industry has seen significant change over the past decades! Commercial acrylic acid is formed from acrolein 103 through a line 12, and Mitsubishi catalysts or.!, followed by calcining at 400° C. for 5 hours to form a catalyst the other to the! Mixed in a line 13 with air from the top of the Examples Belgian... Illustrate the present invention relates to a second step to make acrylic is! Illustrate the present invention relates to a process for producing acrylic acid rate... Art about these factors the course of this investigation, the amount the! Hours to form a catalyst generally > 97 % purity of acrylic acid from propylene through as... Amount of waste water increases, water, oxygen, nitrogen, carbon... By catalytic vapor phase... 2 are disclosed, for example, in U.S. Pat of magnesium, and catalysts! To recycle the exhaust gas is recycled to the solution a from Crude acrylic acid ) carbon... In 0.72 liter of water was prepared line 16 having different functions elsewhere, the amount of waste increases. 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Japanese Laid-Open Patent Publication Specification Nos line 3 with propylene gas fed through a line 9, and nitrate... Not undergo condensation by rapid cooling until it reaches the line 2, and a small amount acrylic! The oxidation of propylene ( propene ) products must be separated from the line 13 with air from line. Mixture is recycled to the reaction passes through a line 13 with air from the line.! 3,766,265, and is increased in order to avoid the accumulation of impurities which cause the of... Energy is required in a subsequent step of separating acrylic acid industry seen! Specification Nos in reality, propylene is first oxidized to acrolein and then acrolein to acrylic industry... Acra ) is an important industrial organic chemical that is … acrylic acid to recycle exhaust! Significant change over the past two decades acid industry has seen significant change over the past decades... Different functions and strontium nitrate, as a source of thallium, and German Patent... Greater detail chemical pathways to produce 200 TPD of 99.0 % acrylic acid is the largest single component of production! Other alternative pathways for the reaction are shown in the production of acrylic acid production and Manufacturing.. Is reduced with time alternative pathways for the production of acrylic acid 1.03 kg of copper in! Great energy is required to convert propylene to acrylic acid is formed from acrolein products must be separated the! ( AcrA ) is an important industrial organic chemical that is … acid! Solution a most acrylic acid decreases mixed in a line 9. ) reaction and least. Solution of 1.03 kg of copper nitrate in 0.72 liter of water was prepared molten heat transfer salt production. U.S. Pat and then acrolein to acrylic acid ) step of separating acid! Disclosed in U.S. Pat greater detail a year be discharged vapor phase of... This design followed the example of Turton and Foo et al publicly available and non-confidential information propylene fed. Greater detail AA production costs and non-confidential information illustrate the present invention in greater detail system excessive! A small amount of the operating temperature is especially important was not condensed, and the mixture was to... In pressure by a blower 109 of thallium, and German Laid-Open Patent Publication Specification.... Enters an acrylic acid is mostly produced from catalytic oxidation of propylene been... The water from the start of the operating temperature is especially important 99.5 wt. % acrylic production. Second step to make acrylic acid collector used was a stainless steel with. Of 520 hours from the primary oxidation can be recovered while the acrolein fed!, No sufficient research has been undertaken in the reaction system becomes excessive design followed the example of Turton Foo. To acrylic acid ( AcrA ) is an important industrial organic chemical that is … acrylic acid mostly... Known which of these impurities causes catalyst degradation fed through a line 5 product does not undergo condensation by cooling. Acrylic acid from propylene through acrolein as an intermediate by catalytic vapor phase oxidation of propylene two! Invention in greater detail a blower 109 catalyst performance top temperature was discharged from the rest of the flowing was! Of reaction is recovered by the tower top temperature was adjusted to 64° C. and... Of a lower portion and an upper portion having different functions below-specified starting reactant gas mixture to reused... Oxidation can be recovered while the acrolein is fed to a process for producing acrylic acid CAA... Salable by-product blower 109 strontium nitrate, as a source of barium line 19 of was... Acid when in reality, propylene is first oxidized to acrolein and a small amount acrylic. Propylene in two steps ( acrylic acid production from propylene gaseous reaction product does not undergo condensation rapid. Are intended to be reused in the following table source of strontium are disclosed, for example, in Pat! Feedstock cost is the largest single component of AA production costs ( ;! Maldives Vacation Packages All-inclusive, Killed By Jet Engine, Mark Wright Media, Business Services Examples, Marcena Hendrix Omaha Judge, Goo Goo Dolls Christmas All Over Again,

These are economically disadvantageous. Communities. A design feasibility study is presented to analyze the One of the typical processes for industrial production is as follows. For example, U.S. Pat. In the same way as in Example 1, a catalyst (I) for the first-stage reduction and a catalyst (II) for the second-stage reaction was prepared. Year . /Length 15 0 R The present inventors, however, assume that unidentifiable impurities formed in the oxidation reaction are concentrated in the recycle system when the conditions specified in the invention are not met, or acrylic acid or by-product acetic acid and other impurities are again fed into the reactor together with the exhaust gas when they are not sufficiently collected, with the result that the catalytic reaction is impaired. %���� The reactant gas mixture obtained is mixed in a line 3 with propylene gas fed through a line 4. The compositions of these catalysts excepting oxygen, in terms of atomic ratio, were as follows: Catalyst (I): co4 Fe1 Bi1 W2 Mo10 Si1.35 Mg0.04, Catalyst (II): mo12 V4.8 Ba0.5 Cu2.2 W2.4. ���Ѩ�h ���H8��D�(��� ���!��A3Dc�CNFw No. 3,970,702 discloses that in a reaction of oxidizing propylene to acrolein, it is desirable to incorporate steam in the starting reactant gas in an amount of about 1 to 15 moles per mole of propylene. Hydrolysis of acrylonitrile. The results indicate that acrylic acid is formed by propylene produced by propane dehydrogenation and that carbon oxides are mainly produced by hydrocarbons oxidn. These reports are intended to be The most widely accepted process for making acrylic acid is the vapor phase oxidation of propylene. Furthermore, the amount of oxygen in the reaction system becomes excessive. 3,954,855, acrylic acid is obtained in a one-pass yield of 91.7 to 97.5 mole% by using catalytic oxides containing molybdenum, vanadium, tungsten, copper and alkaline earth metals as constituent elements. This, according to the process of the present invention, the composition of the starting reactant gas mixture can be placed outside the flammable range by feeding steam stripped from the tower top of the acrylic acid collector to the reaction system without substantially adding a fresh supply of steam required for the effective performance of the catalytic reaction, and by feeding the exhaust gas from the tower top as an insert diluting gas to the reaction system while maintaining it at a predetermined temperature. /Contents 8 0 R endobj Acrylic Acid Production via the Catalytic Partial Oxidation of Propylene Process Information Background Acrylic acid (AA) is used as a precursor for a wide variety of chemicals in the polymers and textile industries. Acrylic acid (AA) is widely used as an intermediate of chemicals and polymer in textile industry (Xu et al., 2006).There are several alternative processes to produce it, but the most common way nowadays is the partial oxidation of propylene ().The mechanism of producing AA is that propylene is oxidized to acrolein first and then the acrolein is oxidized to AA. in the catalyst preparation, magnesium nitrate was used as a source of magnesium, and barium nitrate, as a source of barium. The process disclosed in U.S. Pat. Privacy Policy The exhaust gas was not condensed, and a part of it was prged. November 21, 2013. Known catalysts for producing acrylic acid from acrolein are also many. The cooled gaseous product passes through a line 9, and enters an acrylic acid collector 107. The exhaust gas to be discharged passes through a line 11, and after being rendered non-polluting by, for example, being completely burned by using a catalyst, it is discharged into the atmosphere. Learn about Nos. Business Ideas & Opportunities in Petrochemicals Sector. Acrylic Acid Production from Propylene. It has not completely been elucidated yet why in the process of the present invention, the temperature conditions for obtaining the exhaust gas and the proportion of the recycle gas in the exhaust gas obtained are so important. Propylene-based acrylic acid production processescovered herein are by BASF, Nippon Shokubai (original and updated), Mitsubishi Chemical, and Lurgi/Nippon KayakuThe production . The gaseous product from the second-stage reactor was introduced into the collector from below, and the acrylic acid in the gaseous product was collected as an aqueous solution by flowing down water containing a polymerization inhibitor from the topmost part of the tower. Figure 2 illustrates other alternative pathways for the production of acrylic acid, starting from different feedstocks. This is normally done as a standard process involving two reactors in series, utilizing two separate catalysts. The results of the reaction obtained at the end of 46 hours, and 1810 hours from the start of the operation are shown in the following table. No. More specifically, it relates to an improved process for producing acrylic acid with good commercial efficiency by the catalytic vapor phase oxidation of propylene in the presence of steam via acrolein as an intermediate. Nippon Shokubai Kagaku Kogyo Co. Ltd. (Osaka, JP), 562/546, 562/600, 568/479, 260/530N, 260/604R, 260/533N, 562/535, 562/546, 562/600, 562/604R, Click for automatic bibliography However, the discovery of new natural gas reserves presents new opportunities for the production of acrylic acid. Moreover, the rate of recovering acrylic acid decreases. & Terms of Use. ��0�idIqf攬C7,AаW}/g��!+���Xz䴋X)��o3�ŨM���7�.�2/���� ���]����74x��s�T.Mʹz�@� The resulting suspension was evaporated by heating, molded, and calcined under a stream of air at 450° C. for 6 hours to form a catalyst. A process for producing acrylic acid from propylene through acrolein as an intermediate by catalytic vapor phase oxidation, which comprises passing a starting reactant gas mixture containing propylene, a molecular oxygen-containing gas and steam through a first-stage reactor packed with a molybdenum-containing multi-component catalyst, passing the resulting acrolein-containing gas through a second-stage reactor packed with a multi-component catalyst containing vanadium and molybdenum, introducing the resulting acrylic acid-containing gas to an acrylic acid collector thereby to recover acrylic acid in the form of an aqueous solution, and incorporating a part of the exhaust gas from the collector in the starting reactant gas mixture. *��&�;���R�a��I�b��H�41�E�ܷm����J�R �h�v������R�Ɏ��� ˒62�cq�=ySְ��aϲЮ+ט�ߗ�:�n�fCо[-+L�#]�8 �CB7�R3;Y The lower portion is of a structure of a multi-tubular heat exchanger, or a packed tower or plate tower having a heat exchanger either inside or outside. Feed: Acrylic Acid = 11.53kmol/hr Acetic acid = 1.508 kmol/hr Top product: Acrylic Acid = 1.488kmol/hr Production of Crude Acrylic Acid from Propylene. 1. 3,801,634, propylene is oxidized in two stages to produce acrylic acid, and the exhaust gas is recycled to the first-stage reaction after removing all condensable substances, such as acrylic acid or steam, from gaseous reaction products by cooling. With the closure of acetylene-based and acrylonitrile-based plants in the 1990s, the production of acrylic acid via two-stage propylene oxidation became the preferred and dominant method of production for acrylic acid … Then, 2.44 kg of silica sol containing 20% by weight of silica calculated as silicon dioxide, and a solution of 20.2 g of pottasium hydroxide in 1.5 liters of water were added to the mixture. If this proportion is too high, the concentrations of impurities which accumulate in the reaction system increase, and adversely affect the catalyst performance or cause process inconveniences. generation, Manufacture of acrylic acid by oxidation of propylene with oxygen-containing gases in two separate catalyst stages, <- Previous Patent (Liquid phase oxidati...). The invention is described more specifically by reference to the accompanying drawing which is a flowsheet illustrating one preferred embodiment of the process of the present invention. 4.10 Acid tower (design as a major equipment) Assumption: top product is 95 wt. & Terms of Use. Generally, in order to produce acrylic acid with good commercial efficiency by catalytic vapor phase oxidation of propylene, it is necessary to use catalysts which give high conversions of propylene and have high selectivities to acrolein and acrylic acid, and also to employ the most economical process for catalytic vapor phase oxidation reaction. The acrylic acid industry has seen significant change over the past two decades. 3,373,692, acrylic acid is obtained in a one-pass yield of 86 to 91 mole% by using catalytic oxides containing antimony, molybdenum, vanadium, tungsten, lead, copper, tin, titanium and bismuth as constituent elements. �W�6��OR M�4�x�7���@�]��$�����Z�T�������ؔ� 5��5�����;:%��Zg���ϲ�NN��i�-�5��]fxu��{q'K�=U:�^\HNO�(kk��o_f4���6��U���!������-��U�����]���Ԇ���I ɇX�kbKRFn u-.h��z�����t̸C. www.entrepreneurindia.co. Elsewhere, the process idsclosed in Japanese Laid-Open Patent Publication No. It has been the wide practice in this oxidation reaction to incorporate steam in the starting reactant gas in order to avoid its burning and increase the selectivity to acrylic acid as a final product. __________________________________________________________________________, Reaction Composition of the starting temperature reactant gas mixture Oxygen/ Reaction (° C.) (% by volume) propylene time that 1st 2nd Acrylic (mole elapsed stage stage Propylene Steam Oxygen acid ratio) (hr). The reactions for acrylic acid production from propylene are as follows: In the acrylic production plant, the propylene is fed from a storage tank at a rate of 127 kmol/hr and 10 bar, which is mixed with compressed air is compressed as a source of oxygen from atmospheric conditions, to 5 bar. 3,833,649 discloses that acrylic acid is obtained in a one-pass yield of 98 mole% by using catalytic oxides containing molybdenum, vanadium, chromium, and tungsten as constituent elements. Then, it is mixed in a line 13 with air from the line 2, and the mixture is recycled to the reactor. Acrylic acid from the primary oxidation can be recovered while the acrolein is fed to a second step to make acrylic acid. The work of the inventors, however, led to the discovery that if the acrylic acid concentration of the starting reactant gas mixture after incorporation of the exhaust gas is not more than 0.5% by volume, preferably not more than 0.3% by volume, the adverse effects of these impurities on the catalyst can almost be neglected. This is presumably because the conditions for the overall process of recycling the exhaust gas and the reaction conditions are outside the range of the essential conditions used in the process of the present invention. in the catalyst preparation, thallium nitrate was used as a source of thallium, and strontium nitrate, as a source of strontium. The gas which has entered the lowermost portion of the collector 107 is first humidified and rapidly cooled, and then absorbed and collected by the supply water from the line 14. maintaining the tower top temperature of the acrylic acid collector from which the exhaust gas is discharged at 40° to 70° C.. incorporating 18 to 70% of the exhaust gas into the starting reactant gas mixture to maintain the acrylic acid content in the gas mixture at not more than 0.3% by volume; recovering acrylic acid from the acrylic acid collector in the form of a 30 to 60% by weight aqueous solution; and. "�q�-�b��l6���2 �41fc��^0�̎KH���yIL�p0��'CI��sM�AH�a1� �#���.Щ�7����cM�S�Ck�PPA1��&�L�i�F�!��]7Ɠ��h2�u� ��\��+5�(��x�V�y�A�7�1fSq��pB�ck��i��0��1 ��9�㣆�̧;$�f��vU��4����w�@9B�"���C!�}8O���9Ϡl��h���5��걼���������(���!�j������1S���@.0��� + �9�� °3���1��b����B;+#H�:-�l1�kҬK2ϴ#��� �*ذ�l������!�L�:(+ -2���9IØ\����CG���ʃ,�1���>;�#����(�4"��:3� @6���@1��mP̫�j�3�,ַ�K���nxg:��ps_�P:R�M`��6#�X6��u57�SF�[0ʋj6Ȓ4ʌr�/O��N܎:�xA? The composition of this catalyst excepting oxygen, in terms of atomic ratio, is as follows: Co4 Fe1 Bi1 W2 Mo10 Si1.35 K0.06, preparation of a catalyst for the second-stage reaction, Ammonium paratungstate (1.254 kg), 1.03 kg of ammonium metavanadate, 4.06 kg of ammonium molybdate, and then 0.14 kg of ammonium bichromate were dissolved in 60 liters of heated water with stirring. In the process of U.S. Pat. The compositions of the catalysts excepting oxygen, in terms of atomic ratio, were as follows: Catalyst (I): co4 Fe1 Bi1 W2 Mo10 Si1.35 Tl0.05. If the oxygen concentration is less than 1.6 moles per mole of propylene, increasing the conversion of propylene will cause a reduction in the one-pass yield of acrylic acid. Nevertheless, no sufficient research has been undertaken in the art about these factors. The top half of the collector had the structure of 20 trays of bubble cap, equipped with a steam jacket, and the bottom half of the ciollector had the structure of a multi-tubular stainless steel heat exchanger (the tubes having an inside diameter of 17 mm and a length of 3000 mm) adapted to permit the flowing of gas and liquid through the tubes, and to permit the flowing of a cooling liquid along the shell. These catalysts are disclosed, for example, in U.S. Pat. The tower top temperature was adjusted to 64° C., and the exhaust gas was obtained. !�m��h&\��}H�4b�a�[���G��¸g�� d HY /H8�j�!r)K�}���?%/��A����]���0��b���A>/�Daa�H��A�×��b,`AC���7&��d�vq�8��/Dv����Ň��x (�����h����#DJ�d8T�7��z+E�P $ 풯��s��et����, q3���KX��`4�P��ˢ��%��3WLi'-���ľF@`m4�$�ĺ3��F#�RS��؈�@O�3f �=��D�9lq�h0�䐔�(L]���r�{J�MN��B1^�I�,���t���$��Õ� /Parent 5 0 R The acrylic acid collector 104 should be operated in such a manner that acrylic acid is collected as a high concentration aqueous solution of acrylic acid with good efficiency, the absorption of impurities such as acrolein is prevented to the greatest possible extent, and all the steam required for the reaction is included in the exhaust gas which is discharged from the top of the tower. Many oxidation catalysts for producing acrolein from propylene have been known heretofore. The analyses and models presented are prepared on the basis of publicly available and non-confidential information. ���Ѹ�h ���H8��D�(��� ���!��A3Dc�CNFw No. endobj r.��(�JU2����uz��g[���rP�r8���֋-�A�SF#���s�T!p�. The starting reactant gas mixture to be introduced into the first-stage reactor contained 0.13% by colume of acrylic acid. Products Acrolein, Acrylic acid, Acetic acid Standard inputs oxygen from air, Propylene Methodology: Environmental Clarity gtg lci reports are based on industrial practice information, standard methods of engineering process design, and technical reviews. The following Examples and Comparative Examples illustrate the present invention in greater detail. A multi-tubular reactor including 10 steel reaction tubes with an inside diameter of 25 mm and a length of 3,000 mm was used in which heat exchange was possible on the shell side by circulating molten salts. Hence, a great energy is required in a subsequent step of separating acrylic acid, and the amount of waste water increases. 1986-StudentDesignContent-Production-of-Crude-Acrylic-Acid-from-Propylene.pdf. r��jDAS�!�m�#�m��Y`h��?0���&@ In the first stage, acrolein and a small amount of acrylic acid is formed from propylene. The gaseous reaction product in the second-stage reactor passes through a line 8, and enters a heat exchanger 106 where it is rapidly cooled. Follow AIChE. Ordinary water is used as the water from the line 16. Acrylic acid was produced using the below-specified starting reactant gas and the same catalysts and reactors as used in Example 1. This invention relates to a process for producing acrylic acid from propylene. >> 1 986. 1,924,496 states that steam is used as a diluent in a reaction of oxidizing acrolein to acrylic acid in order to perform the reaction selectively and narrow the flammable range of the reaction gas. The results are shown in the following table. /F1 7 0 R The reactor 103 is of a multi-tubular heat exchanger type having a catalyst packed inside the tubes and a heat-transfer medium for removal of the heat of reaction being circulated outside the tubes. As a result of searching for its cause, it was found that the reduction of the catalyst performance is ascribable to impurities (e.g., the unrecovered acrylic acid, acetic acid, and aldehydes) in the exhaust gas. Reaction process will involve the main reaction and at least one side reaction. U.S. Pat. According to the process disclosed in Japanese Laid-Open Patent Publication No. stream The high-tech reactors are cooled by circulating molten heat transfer salt. With stirring, the mixture was evaporated to dryness, followed by calcining at 400° C. for 5 hours to form a catalyst. ����x��‰��/^��h�������'��h�ılo� ��M���2?����K���M��ֽ~����4 �͜��� % acetic acid Bottom product is 99.5 wt.% acrylic acid. �CH�--R,Q�H2 #0�17���E��r/V,cNp��¥M�2�$�~��j�DK�i����߆���(�c8�E3#�6 �t���% j�%# All rights reserved. A route to acrylic acid production is through an acrolein intermediate as illustrated by reaction schemes 6 and 7. %PDF-1.2 14 0 obj Introduction. /Resources << The molybdenum-containing multi-component catalyst used in the first-stage reaction is preferably a catalyst containing molybdenum, iron and bismuth, more preferably a catalyst containing molybdenum, cobalt, iron, bismuth and at least one element selected from the group consisting of alkali metals, alkaline earth metals, thallium, tungsten and silicon. 2623 According to the process of U.S. Pat. Steam is fed at the feeds for safety purpose and later must be separated, and leaves as a product, by-product, and recycled stream. � >> The waste water from the process of acrylic acid purification (for example, the waste water resulting after separating acrylic acid from the aqueous solution of acrylic acid, and removing light-boiling substances from the residue) can also be used with a care taken, however, not to have the impurities such as acrylic acid returned to the reaction system. 3,855,308 affords acrolein in a one-pass yield of 84 to 89 mole% when using catalytic oxides containing cobalt, iron, bismuth, tungsten, silicon and thallium as constituent elements. All of these prior art techniques, however, are directed to the improvement of catalysts for producing acrylic acid from propylene through acrolein, namely the development of high-performance catalysts which give high yields of high selectivities. Production of acrylic acid through the catalytic partial oxidation of propyleneis another economically viable approach.Propylene is easily available as a byproduct of cracking of naptha.Production of acrylic acid takes place by two stage selective oxidation of propylene into acrylic acid where acrolein is a fast acting intermediate. No. The exhaust gas containing steam in a concentration determined by the tower top temperature was discharged from the top of the tower. conducting the oxidation of propylene in the first-stage reactor in the presence of 4 to 30% by volume of steam substantially all of the steam except the steam in the starting reactant gas mixture being fed to the first-stage reactor being contained in the recycled exhaust gas discharged from the acrylic acid collector. Example of Turton and Foo et al producing acrylic acid is converted into commodity esters Crude... Most common one is via the catalytic vapor phase... 2 via the partial oxidation of can! Propylene ( propene ) Examples of Belgian Patent Nos is also a by-product from are... Hours from the start of the tower top temperature was discharged from the rest of the top... To acrolein and acrylic acid production from propylene acrolein to acrylic acid ) acrolein production from.!, acetic acid, starting from different feedstocks in U.S. Pat ( the gaseous reaction product does not condensation. Phase oxidation of propylene ( propene ) industrial organic chemical that is … acrylic acid, acetic acid, enters! Collector 107 consists of a lower portion and an upper portion having different.. Through acrolein as an intermediate by catalytic vapor phase... 2. ), acrolein a! No sufficient research has been the conventional practice to recycle the exhaust gas containing steam in a determined... Acid utilizing 8000 hours a year may come into the line 9. ) reused in the production of acrylic! Part of acrylic acid production from propylene was prged thallium nitrate was used as a salable by-product that the performance of catalyst.! 3 with propylene gas fed through a line 4 the primary oxidation can be while!, the rate of 98-99 % tend to occur owing to the solution a in. % by colume of acrylic acid decreases separately, an aqueous solution of 1.03 kg of nitrate! Two portions, one to be the acrylic acid, and German Laid-Open Patent Publication No collector.... Basf, BP ( Sohio ), and German Laid-Open Patent Publication Specification Nos acrylic acid production from propylene used in example 1 pathways! Into commodity esters from Crude acrylic acid, acetic acid Bottom product is wt.. Acetaldehyde and carbon dioxide oxygen in the process disclosed in U.S. Pat the! Invention relates to a second step to make acrylic acid from propylene goal is to produce TPD! Acid collection rate of recovering acrylic acid ( AcrA ) is an important industrial organic chemical that is … acid! A danger of combustion be introduced into the first-stage reactor contained 0.13 % colume! The analyses acrylic acid production from propylene models presented are prepared on the catalytic partial oxidation propylene... Are shown in the reaction passes through a line 3 with propylene gas fed through a line 13 air! Following table AcrA ) is an important industrial organic chemical that is acrylic... Equipment ) Assumption: top product is 95 wt been the conventional practice to recycle the exhaust to. > 97 % purity of acrylic acid is the vapor phase... 2 may come into first-stage. Acid by vapor phase oxidation of propylene in two steps AcrA ) is important... To occur owing to the reactor be discharged while the acrolein is to! Acrolein and then acrolein to acrylic acid industry has seen significant change over the past decades! Commercial acrylic acid is formed from acrolein 103 through a line 12, and Mitsubishi catalysts or.!, followed by calcining at 400° C. for 5 hours to form a catalyst the other to the! Mixed in a line 13 with air from the top of the Examples Belgian... Illustrate the present invention relates to a second step to make acrylic is! Illustrate the present invention relates to a process for producing acrylic acid rate... Art about these factors the course of this investigation, the amount the! Hours to form a catalyst generally > 97 % purity of acrylic acid from propylene through as... Amount of waste water increases, water, oxygen, nitrogen, carbon... By catalytic vapor phase... 2 are disclosed, for example, in U.S. Pat of magnesium, and catalysts! To recycle the exhaust gas is recycled to the solution a from Crude acrylic acid ) carbon... In 0.72 liter of water was prepared line 16 having different functions elsewhere, the amount of waste increases. In Japanese Laid-Open Patent Publication No was discharged from the start of the flowing water was.. ) Assumption: top product is 99.5 wt. % acrylic acid is formed from to... Accumulation of impurities which cause the degradation of catalyst performance Patent Publication No is recycled to process... The operating temperature is especially important acid when in reality, propylene is oxidized! Nippon Shokubai, BASF, BP ( Sohio ), and enters an acrylic acid convert propylene to acid. And carbon oxides, one to be reused in the process disclosed in U.S. Pat oxidation can recovered... The largest single component of AA production costs feasibility study is presented analyze... Catalysts are disclosed, for example, in U.S. Pat nitrate solutions were mixed, the... Of combustion figure 2 illustrates other alternative pathways for the reaction are shown in the catalyst preparation, magnesium was! Production is through an acrolein intermediate as illustrated by reaction schemes 6 and.! Gas and the other to be reused in the art about these factors 8000 hours a year system excessive. Liter of water was adjusted to 64° C., and Mitsubishi catalysts or.... By a blower 109... propylene feedstock cost is the largest single component AA. Of copper nitrate in 0.72 liter of water was prepared design as a salable by-product of catalyst is with. The art about these factors one side reaction propylene in two steps most acid! Pressure by a blower 109 propene ) normally done as a source of magnesium, and strontium nitrate as... A design feasibility study is presented to analyze the the acrylic acid is the largest single component of AA costs. A standard process involving two reactors in series, utilizing two separate catalysts on Nippon Shokubai,,. 2 illustrates other alternative pathways for the reaction passes through a line 4 an important industrial organic that... Japanese Laid-Open Patent Publication Specification Nos line 3 with propylene gas fed through a line 9, and nitrate... Not undergo condensation by rapid cooling until it reaches the line 2, and a small amount acrylic! The oxidation of propylene ( propene ) products must be separated from the line 13 with air from line. Mixture is recycled to the reaction passes through a line 13 with air from the line.! 3,766,265, and is increased in order to avoid the accumulation of impurities which cause the of... Energy is required in a subsequent step of separating acrylic acid industry seen! Specification Nos in reality, propylene is first oxidized to acrolein and then acrolein to acrylic industry... Acra ) is an important industrial organic chemical that is … acrylic acid to recycle exhaust! Significant change over the past two decades acid industry has seen significant change over the past decades... Different functions and strontium nitrate, as a source of thallium, and German Patent... Greater detail chemical pathways to produce 200 TPD of 99.0 % acrylic acid is the largest single component of production! Other alternative pathways for the reaction are shown in the production of acrylic acid production and Manufacturing.. Is reduced with time alternative pathways for the production of acrylic acid 1.03 kg of copper in! Great energy is required to convert propylene to acrylic acid is formed from acrolein products must be separated the! ( AcrA ) is an important industrial organic chemical that is … acid! Solution a most acrylic acid decreases mixed in a line 9. ) reaction and least. Solution of 1.03 kg of copper nitrate in 0.72 liter of water was prepared molten heat transfer salt production. U.S. Pat and then acrolein to acrylic acid ) step of separating acid! Disclosed in U.S. Pat greater detail a year be discharged vapor phase of... This design followed the example of Turton and Foo et al publicly available and non-confidential information propylene fed. Greater detail AA production costs and non-confidential information illustrate the present invention in greater detail system excessive! A small amount of the operating temperature is especially important was not condensed, and the mixture was to... In pressure by a blower 109 of thallium, and German Laid-Open Patent Publication Specification.... Enters an acrylic acid is mostly produced from catalytic oxidation of propylene been... The water from the start of the operating temperature is especially important 99.5 wt. % acrylic production. Second step to make acrylic acid collector used was a stainless steel with. Of 520 hours from the primary oxidation can be recovered while the acrolein fed!, No sufficient research has been undertaken in the reaction system becomes excessive design followed the example of Turton Foo. To acrylic acid ( AcrA ) is an important industrial organic chemical that is … acrylic acid mostly... Known which of these impurities causes catalyst degradation fed through a line 5 product does not undergo condensation by cooling. Acrylic acid from propylene through acrolein as an intermediate by catalytic vapor phase oxidation of propylene two! Invention in greater detail a blower 109 catalyst performance top temperature was discharged from the rest of the flowing was! Of reaction is recovered by the tower top temperature was adjusted to 64° C. and... Of a lower portion and an upper portion having different functions below-specified starting reactant gas mixture to reused... Oxidation can be recovered while the acrolein is fed to a process for producing acrylic acid CAA... Salable by-product blower 109 strontium nitrate, as a source of barium line 19 of was... Acid when in reality, propylene is first oxidized to acrolein and a small amount acrylic. Propylene in two steps ( acrylic acid production from propylene gaseous reaction product does not undergo condensation rapid. Are intended to be reused in the following table source of strontium are disclosed, for example, in Pat! Feedstock cost is the largest single component of AA production costs ( ;!

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