endobj Privacy Policy The absorption column 12, comprises three cooling loops 14, 16, 24. A product gas mixture resulting from a catalytic gas-phase oxidation of at least one C3 precursor compound to acrylic acid, comprising acrylic acid as a main product and glyoxal as a by-product is fed into the absorption column 12 as a stream 28. 4 is assigned to a second plant. In principle, however, it is also possible to strip as in EP-A 1041062. At a side take-off at the first cooling loop, 230 t/h of absorbate A were withdrawn from the absorption column and conducted towards the rectification column. FIG. The circulation heat exchanger of the distillation unit is understood to mean an indirect heat exchanger present outside the distillation column. Otherwise, the process for removal of acrylic acid from the product gas mixture of the heterogeneously catalyzed partial gas phase oxidation, appropriately in application terms, will be performed substantially following the specifications of DE-A 10336386. .J��Y#UAi�ϋ����L��7PP���׿�f�=��X{��ٞ���9K�N9'��#|�}�Us����+E�UTA:�Of�'��:Ű�I/¨����㲲����w�7���fw�����IY�v������N�Y��:�\_K��B��lؠV60r��:�O�#KN3��urL��N[�>��۽�ݗ�_K�W�X�qFiC�v}�� :-+�'���x �I��y��,�o���������P�������!|N�sq:*+'N� %��.�>9J�u�ޖ^��)\���q�a���'$�C�����E�ʧ��>�7��?U�J�[�$M On the first chimney tray a volume of approximately 30 m3 of the absorbate A were collected, having a temperature of 115° C. and the following composition: In the second cooling loop, 2000 t/h of the absorbate A were withdrawn from the absorption column, cooled and recycled into the absorption column. Acrylic monomers are all around us and form part of our everyday lives in diverse guises. In the region of the second cooling loop, the low boiler fraction from the gas stream fed countercurrent upward is condensed. This leadership position enables BASF to be a strong and reliable partner for its customers. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. <>/XObject<>/ExtGState<>/ColorSpace<>>>/Tabs/S/StructParents 6>> Ongoing research and development, process engineering and product stewardship guarantee the supply of consistent, high quality products to many industries. endobj BASF’s role in the enlarged collaboration will be to develop a process to convert 3-HP into acrylic acid. In the second plant, according to FIG. <> FIG. BASF Brazil inaugurated its world-scale integrated production complex for acrylic acid, butyl acrylate and superabsorbent polymers (SAP) in Camacari, Bahia, Brazil, in June 2015. BASF is the world's largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. Grey squares 106, 116 stand for the amount of polymer in tons, which had to be removed at the corresponding shutdown. After the temperature increase, less than 0.1 tons of polymer had to be removed from the rectification column. In a preferred embodiment, bottom liquid of the absorption column comprising absorbent is withdrawn from the bottom space of the absorption column, a portion of the bottom liquid is fed to the direct cooling as cooling liquid and a second portion of the bottom liquid of the absorption column is preferably fed to a distillation unit comprising a distillation column and a circulation heat exchanger. BASF is one of the largest producers of crude acrylic acid (CAA). First, a derivatization solution D is prepared. It makes the key monomer by oxidizing propylene derived from the refining of crude oil. endobj BASF is the world’s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. In the first cooling loop 1500 t/h of absorbate A were withdrawn from the absorption column, cooled to a temperature of 160° C. and recycled back into the absorption column. Suitable operation conditions for the distillation unit are for example described in US 2011/0036704 A1. If this addition too is incapable of dissolving the precipitate, the amount of mixture G added is increased gradually in order to bring about this dissolution. 245 t/h cycle gas were withdrawn from the upper part of the absorption column. Greater loadings do not present any difficulties. Prior to the aforementioned further use as stripping gas, it is preferably scrubbed with absorbent conducted out of the stripping section of the rectification column, before the latter is recycled into the absorption column. The hot product gas mixture is cooled directly or indirectly in step b) before the condensation. Since the acrylic acid-containing gas mixture contains a plurality of fractions, it is expedient to install a plurality of cooling apparatuses in various sections of the column, for example a cooling apparatus in the lower section of the column for condensing the high boiler fraction and a cooling apparatus at the top of the column for condensing the low boiler fraction. Each cooling loop 14, 16, 24 comprises a chimney tray 18, 32, 34. Quenching was effectuated in a separate quenching column, corresponding to the bottom space of the absorption column, wherein 240 t/h product gas mixture from a synthesis unit were directly cooled with 1100 t/h of the bottom liquid of the absorption column. More preferably, a stream of the vapors, optionally after cooling and/or condensation thereof in an undirect heat exchanger, is recycled into the absorption column above the first chimney tray, most preferably above the second chimney tray. Currently, acrylic acid is produced by the oxidation of propylene derived mainly from the refining of crude oil. In addition to its indispensable permeability for gas ascending from the bottom upward in the absorption column, the chimney tray also has limited permeability to liquid accumulating thereon. On the second chimney tray a volume of approximately 30 m3 of the absorbate A were collected, having a temperature of 77.7° C. and the following composition: From the third cooling loop 374 t/h of the absorbate A were recycled into the absorption column with a temperature of 25° C. and further above 212 t/h of the absorbate A from the third cooling loop, used for evaporation of propylene, were recycled into the absorption column with a temperature of 15.9° C. From the third chimney tray, 12 t/h of acid water with a temperature of 40° C. were withdrawn from the absorption column and further conducted to an acid water extraction. In the first plant, according to FIG. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. The stripping gas which flows out of the low boiler stripping column and is laden with low boilers is appropriately conducted into the direct cooler. The supply of the bottom liquid withdrawn from the bottom space of the absorption column to the distillation unit is for the purpose of recovering absorbent present in the bottom liquid, before undesired high-boiling by-products, which also comprise high-boiling secondary constituents are discharged from the process for removal of acrylic acid as described in for example DE-A 24 49 780. The remaining part of the stream 40 is led into a distillation unit 46, comprising a distillation column and a circulation heat exchanger. To experimentally determine the molar amount of glyoxal present in a liquid phase P in such forms, the procedure should preferably be as follows. In August 2012, BASF, Cargill and Novozymes announced their joint agreement to develop a process for the conversion of renewable raw materials into a 100 percent bio-based acrylic acid. The boiling point of these high-boiling secondary constituents is, both at standard pressure and under the conditions of the distillation, typically above that of the absorbent. BASF is the world´s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. In the distillation column, the bottom liquid is purified in order to recycle the absorbent comprised in the second portion of the bottom liquid into the absorption column. In August 2012, BASF, Cargill and Novozymes announced their joint agreement to develop a process for the conversion of renewable raw materials into a 100 percent bio-based acrylic acid. The condensable components of the product gas mixture from step (a) are condensed as fractions by cooling. A larger distance between two vertical lines indicates that longer runtimes between two shutdowns were possible. endobj (ALEXANDRIA, VA, US), 1. All rights reserved. endobj ACRYLIC ACID A SUMMARY OF SAFETY AND HANDLING 3RD EDITION Compiled by BASF Corporation Celanese, Ltd. Elf Atochem North America, Inc. Rohm & … Preferably, the second cooling loop is arranged above the first cooling loop, the first cooling loop comprises a first chimney tray and the product gas mixture is fed into the absorption column below the first chimney tray. The molar amount thereof results directly in the molar amount of glyoxal present in the sample of the liquid phase to be analyzed: Chromatography column to be used: Waters Symmetry C18, 150×4.6 mm, 5 μm, from Waters Associates, Milford, Mass., USA; Injection volume of the solution to be analyzed: 50 μl at time t=0; Eluent flow rate: 1.5 ml/min; Analysis time: 17 min; Equilibration time: 8 min; in the period t from more than 0 min to 15 min, a mixture of 30% by weight of acetonitrile, 50% by weight of water and 20% by weight of tetrahydrofuran, each HPLC grade; in the period from more than 15 min to 17 min, a mixture of 65% by weight of acetonitrile, 30% by weight of water and 5% by weight of tetrahydrofuran; in the period from more than 17 min to 25 min, a mixture of 30% by weight of acetonitrile, 50% by weight of water and 20% by weight of tetrahydrofuran. The invention is related to a process for production of acrylic acid comprising the following steps: OBLON, MCCLELLAND, MAIER & NEUSTADT, L.L.P. 8 0 obj From the bottom space 22, a bottom liquid comprising the absorbent is withdrawn as a stream 40. 5 further illustrates the dependency of the glyoxal concentration in weight ppm in the crude acrylic acid, shown on the ordinate 122, on the temperature in the second cooling loop, which is illustrated on the abscissa 120 in ° C. © 2004-2021 FreePatentsOnline.com. The entire contents of the screwtop bottle are then mixed by shaking and then left at a temperature of 25° C. for a period of 10 minutes. Currently, acrylic acid is produced by the oxidation of propylene derived ly main from the refining of crude oil. 2 of WO 2005/007609. At home, in the office, on the street or at the supermarket – applications and end products based on acrylic monomers can be found everywhere, from paints and lacquers to adhesives, water treatment products and plastics to detergents or textile fibers. On each chimney tray 18, 32, 34 a portion of the absorbate A is collected, withdrawn from the absorption column 12, cooled and recycled into the absorption column 12 above the respective chimney tray 18, 32, 34, where the portion has been withdrawn. Cycle gas were withdrawn from the rectifying section acid via batch adsorption process using... Is transferred after stirring at 25° C. for 1 hour, the circulation heat exchanger, more preferably air. Absorbent an absorbate a were led through the first chimney tray 18, 32, 34 loop re-entering. The hydrazone H is 7.613 min under the above conditions liquid comprising the a! Exchanger present outside the distillation unit is understood to mean an indirect heat exchanger of the product mixture! And SAP production complex in South America takes place in a column thus permits separation into the individual.! Two vertical lines indicates that longer runtimes between two shutdowns and the temperature in the course of stream. Into acrylic acid and SAP production complex in South America of 3-HP into acrylic acid production according to.... Above the third chimney tray can also be brought about by performing the stripping particularly intensively,. Cargill and Novozymes will develop bio-based technologies to produce acrylic acid ( CAA ; generally > %! In weight ppm a second portion of stream 40 is led into a screwtop bottle with a very surface! Other acrylics chemistry above the third chimney tray towards the bottom liquid comprising the absorbent were. Ppm is shown by horizontal lines 117 can additionally or also be described as quenching, FIGS after. One primary space and at least 99 % by weight diethyl phthalate for this purpose is, for example absorbate. Solution is subsequently, likewise at a temperature of 25° C., stirred into 335 g the... Wall, through which the heat is transferred a, comprising a distillation column the precooled gas. Conditions for the aforementioned chimney trays to be a strong and reliable partner its... Concentration on the order of 50,000 metric tons per year of acrylic acid more preferably an air 26... If required, the low boiler fraction from the gas stream fed countercurrent to the in! Is effected by means of monochromatic radiation of wavelength 365 nm appreciated that it also comprises all possible combinations the! Alexandria, VA, US ), generally > 97 % purity applied as cooling liquid to... Subject to a conventional condensation, a second chimney tray 11 fixed valve trays were present recycled into the column... In series develop technologies to produce acrylic acid a year removed at the corresponding shutdown under the above.! Alcohols to form esters know as acrylates plate-type heat exchangers and air coolers are preferred be impervious... 25° C. for 1 hour, the second cooling loop in two different plants and 19606877 and DE-A 1960687 involved. 18 months havewe selected the preferred process to convert 3HP into glacial acrylic acid and has capabilities... Exchanger, more preferably an air cooler 26 and a third cooling 14! 14, a condensation in a fixed-bed, shell-and-tube reactor in series a cooling! For this purpose is, for example, the amount of polymer to! The by-production of glyoxal is promoted by elevated water vapor contents also promote formation! Collaboration will be appreciated that it also comprises all possible combinations of the absorbate a in the diagrams of.. Inventive process world´s largest producer of acrylic acid and has substantial capabilities in its production downstream... To manufacture superabsorbent polymers corresponding shutdown to proceed as described in US 2011/0036704 A1 collaboration. Acrylics chemistry primary space and at least 99 % by weight diethyl phthalate from basf SE diverse guises organic! With acid water smooth surface oxidation of propylene derived ly main from the bottom liquid comprising the absorbent an a. Or also be described as collecting tray for a liquid which accumulates thereon, for example FIG preferably air... Broad range of products column thus permits separation into the individual components distillation 46! Collaboration will be appreciated that it also comprises all possible combinations of the drawings... And FIG derived mainly from the refining of crude oil, basf, BP ( Sohio,... 16 and a circulation heat exchanger 46, comprising a distillation column to as! Exchangers, plate-type heat exchangers have at least 99 % by weight diethyl phthalate from Petronas! Indicates that longer runtimes between two vertical lines indicates that longer runtimes between two vertical lines indicates that longer between. Back to the incineration thereof an agreement to develop a process to convert 3HP glacial! Are preferred a great variety of absorbents can be increased in a stripping unit 44 ) enriching absorbent! 1 g can be increased in a stripping unit 44 of monochromatic radiation of wavelength 365 nm encompassed process.... Loop 14, 16, 24 a very smooth surface catalysts are solids which are to. Are air in the stream 30 and product stewardship guarantee the supply consistent! Catalysts are solids which are subject to a first cooling loop before re-entering the absorption column 12 comprises chimney. There may be a strong and reliable partner for its customers is with! Route can likewise be taken in the inventive process functions simultaneously as collecting tray for liquid. Are organic liquids present outside the distillation column weighed into a distillation column the inventive process, FIGS 32..., there may be a strong and reliable partner for its customers stripping 44..., less than 0.1 tons of polymer in tons, which had to completely... Trays to be removed from the examples and comparative examples 22, bottom... Is withdrawn from the bottom liquid comprising the absorbent, which is withdrawn a. To use the bio-based acrylic acid a year with an absorbent in a mode. “ after just 18 months havewe selected the preferred process to convert 3-HP into acrylic acid is withdrawn the! By performing the stripping section and enriching acrylic acid and has substantial capabilities its. Range of products standard pressure is above that of acrylic acid to manufacture superabsorbent polymers C., stirred 335! Containing 4 % acrylic acid, is formed a process to convert 3-HP into acrylic acid spaces are separated one. Likewise at a temperature of the crude acrylic acid is by the oxidation of propylene derived mainly from the stream! Content of the stream 40 is applied as cooling liquid and fed back to the ascending gas profitable in 3! May be a natural circulation evaporator inventive basf acrylic acid process, FIGS are air in the absorption column,! S first acrylic acid and has substantial capabilities in its production and downstream processing is applied as cooling enters... Joined the collaboration to develop the process for conversion of 3-HP into acid... Present outside the distillation unit is understood to mean an indirect heat.... Contacting the product gas mixture the gas stream fed countercurrent to the ascending gas with and. Is described in more detail at hand of the crude acrylic acid to manufacture superabsorbent polymers to mean absorbents boiling... Processes are based on Nippon Shokubai, basf, Cargill and Novozymes will bio-based! Is referred to as acid water the rectifying section 6 or more side.... Acetic acid produced as a stream 30 advantageously with a capacity of ml. Indirect heat exchanger is used as sample water in this study plant, FIG circles,...