A process for production of acrylic acid comprising the following steps: a. preparation of a product gas mixture by a catalytic gas-phase oxidation of at least one C, Click for automatic bibliography 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. Presently, acrylic acid is produced by the oxidation of … 2 of WO 2005/007609. “After just 18 months we have selected the preferred process to convert 3-HP into glacial acrylic acid. BASF is the world’s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. As separating internals between the chimney trays, tray types known by the person skilled in the art are applicable such as tunnel trays, fixed valve trays, sieving trays or bubble cap trays or packings. In general, the water vapor content of the starting reaction gas mixture will, however, not be more than 40% by weight, frequently not more than 30% by weight. When low boilers are stripped out of the absorbate A withdrawn from the absorption column in a stripping unit, an absorbate A* is obtained, which is depleted of low boilers and which is subsequently sent to the rectification column with rectifying section and stripping section, in order to enrich the acrylic acid in the rectifying section of this rectification column and to conduct it out of the rectifying section as crude acrylic acid. Grey squares 106, 116 stand for the amount of polymer in tons, which had to be removed at the corresponding shutdown. In the first cooling loop 1500 t/h of absorbate A were withdrawn from the absorption column, cooled to a temperature of 160° C. and recycled back into the absorption column. This route can likewise be taken in the context of the inventive process. 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. Acrylic monomers are all around us and form part of our everyday lives in diverse guises. A second portion of stream 40 is purified and recycled into the absorption column as a stream 42. Glacial Acrylic Acid or prop-2-enoic acid is the starting point for all other acrylics chemistry. As a consequence, there may be a discharge of fine catalyst dust with the reaction gas mixture. 11 0 obj However, it shall also include desorption, corresponding to the removal of an absorbed low boiler from the absorbate, by, for example, heating or by reducing the pressure in the gas phase. The fraction containing the acrylic acid is removed in the middle part of the column, via one or more side take-offs. 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. In the plants, the absorption column comprised 13 fixed valve trays between the first and the second chimney tray and 21 fixed valve trays between the second and the third chimney tray. & Terms of Use. 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. Circles 104, 114 represent the temperature of the absorbate A in the second cooling loop before re-entering the absorption column. Privacy Policy <>/SpiderInfo 279 0 R>> Subsequently, a sample of the liquid phase to be analyzed, the amount of which is in the range from 0.15 g to 2.0 g, is weighed into the screwtop bottle thus filled. To calibrate the HPLC method, appropriately in application terms, a solution of monomeric glyoxal in methanol will be used, which comprises 50 ppm by weight of monomeric glyoxal. <> With increasing temperature in cooling loop 2, the runtime between two shutdowns was increased to up to 50 days and less than 0.1 tons of polymer had to be removed during shutdowns. The uncondensed components, which are preferably nitrogen, carbon monoxide, carbon dioxide, oxygen, methane, propane and propene, are removed from the top of the absorption column. Consequently, the product gas mixture entering the absorption column is quenched with the bottom liquid of the absorption column. From the stripping unit 44 a feed stream F 2 is introduced into a rectification column 4, comprising a rectifying section 6 and a stripping section 8. The retention time of the glyoxal as the hydrazone H is 7.613 min under the above conditions. The precooled product gas mixture ascends in the absorption column 12 and is contacted with an absorbent in a countercurrent mode. Figure 1 depicts a propylene oxidation process similar to technology for the production of ester-grade acrylic acid (EAA) that was developed by Lurgi GmbH (Frankfurt, Germany; part of Air Liquide; Paris; www.airliquide.com) and Nippon Kayaku (Tokyo; www.nipponkayaku.co.jp). It makes the key monomer by oxidizing propylene derived from the refining of crude oil. 3 and 4 show the results from the examples and comparative examples. a) preparation of a product gas mixture by a catalytic gas-phase oxidation of at least one C. c) contacting the product gas mixture in countercourrent with an absorbent, wherein an absorbate A, comprising the absorbent and absorbed acrylic acid, is formed. %PDF-1.6 These primary and secondary spaces are separated from one another by a heat transfer wall, through which the heat is transferred. In terms of apparatus, this preliminary cooling can be integrated in the bottom space of the absorption column with or without column baffles or can be separated from the column in a separate apparatus, for example a gas cooler, a quench apparatus or a flash pot. The most commonly used processes are based on Nippon Shokubai, BASF, BP (Sohio), and Mitsubishi catalysts or technologies. FIG. BASF is the world’s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. endobj endobj In a particularly preferred embodiment, the condensation of the reaction gas mixture takes place in absorption column as follows, it being possible to organize the absorption column in various sections in which the following different process functions are performed: The hot product gas mixture is passed into the bottom space and cooled. This is in particular because the catalysts used as active materials for the partial oxidation are normally multimetal oxide materials comprising Mo, Bi and Fe and/or multimetal oxide materials comprising Mo and V. Owing to its water vapor content, the reaction mixture is capable, for example, of promoting the discharge of molybdenum oxides from the active materials. A second cooling loop 16 is arranged above a first cooling loop 14 and a third cooling loop 24 is arranged above the second cooling loop 16. This leadership position enables BASF to be a strong and reliable partner for its customers. an acrylic acid price of $1.75/lb. In FIG. Addition of 0.5 g of glacial acetic acid, available for example from Aldrich with a purity of at least 99.8%, to the screwtop bottle subsequently freezes the hydrazone formation which has occurred. 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. GAA and the its acrylates are used as the components for polymers used in adhesives, coatings, inks, plastics, elastomers, water treatment, personal care, and various other industries. 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. Furthermore, the catalysts are solids which are subject to a certain degree of weathering in the course of the operating time. endobj 1 0 obj 5 0 obj FIG. Further, from the bottom space of the absorption column 62 kg/h of the bottom liquid, which was enriched in high boiling impurities, were withdrawn from the absorption column and removed from the process. US3002017A US826768A US82676859A US3002017A US 3002017 A US3002017 A US 3002017A US 826768 A US826768 A US 826768A US 82676859 A US82676859 A US 82676859A US 3002017 A US3002017 A US 3002017A Authority US United States Prior art keywords acrylic acid temperature homopolymer cooled beta Prior art date 1959-07-13 Legal status (The legal status is an assumption … From the distillation unit 46, a stream 42 comprising purified absorbent is recycled into the absorption column 12 above the second cooling loop 26. Optionally, substances which complex metals, for example EDTA, can be added to the bottom liquid in the bottom space of the absorption column. In contrast to a conventional condensation, a condensation in a column thus permits separation into the individual components. Prior to this recycling, it is appropriate to extract a portion with acid water. BASF, Cargill and Novozymes have signed an agreement to develop technologies to produce acrylic acid from renewable raw materials. Preferably, the product gas mixture is condensed at least partly in the absorption column. 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. <>/XObject<>/ExtGState<>/ColorSpace<>>>/Annots[88 0 R 89 0 R 90 0 R 91 0 R 92 0 R 93 0 R 94 0 R 95 0 R 96 0 R 97 0 R 98 0 R 99 0 R 100 0 R 101 0 R 102 0 R 103 0 R 104 0 R 105 0 R 106 0 R 107 0 R 108 0 R 109 0 R 110 0 R 111 0 R 112 0 R 113 0 R 114 0 R 115 0 R 116 0 R 117 0 R 118 0 R 119 0 R 120 0 R 121 0 R 122 0 R 123 0 R 124 0 R 125 0 R 126 0 R 127 0 R 128 0 R 129 0 R 130 0 R 131 0 R 132 0 R 133 0 R 134 0 R 135 0 R]/Tabs/S/StructParents 3>> BASF follows the conventional vapor-phase, two-stage propylene oxidation chemistry, in which the first stage oxidizes propylene to acrolein, and the second stage oxidizes acrolein to 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. Crude acrylic acid is withdrawn as a stream C 10 from the rectifying section 6. Since, owing to the impurities and diluent gases, the gas mixture contains a high boiler, medium boiler and low boiler fraction and uncondensable components, one or more side take-offs can be provided at the appropriate points in the column. Based on the data from the first plant, FIG. endobj The adsorption capacity was tested by varying different temperature, amount of alumina and contact time. Presently, acrylic acid … The runtime in days between two shutdowns and amount of polymer, which had to be removed during the shutdown, as well as the glyoxal concentration in the crude acrylic acid is represented in dependency of the temperature in the second cooling loop. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. Advantageously in accordance with the invention, the boiling point of the absorbent at standard pressure is at least 20° C., preferably at least 50° C., more preferably at least 75° C. and most preferably at least 100° C. or at least 125° C. above the boiling point of acrylic acid, which is 141° C. at 1 atm, at the same pressure. It can be reacted with alcohols to form esters know as acrylates. The absorption column 12, comprises three cooling loops 14, 16, 24. FIG. The part of the absorbent, which is withdrawn from the stripping section of the rectification column and recycled into the absorption column, preferably comprises a proportion by weight of acrylic acid of not more than 1% by weight. 210 t/h of the absorbent A were led through the second chimney tray towards the first chimney tray. During this time, the corresponding hydrazone H of monomeric glyoxal forms from the monomeric glyoxal present in the screwtop bottle by chemical reaction with 2,4-dinitrophenylhydrazine. BASF plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers that can soak up large amounts of liquid and are used mainly in baby diapers and other hygiene products. In principle, the circulation heat exchanger used may be a natural circulation evaporator. The chimney tray functions simultaneously as collecting tray for a liquid which accumulates thereon, for example accumulating absorbate. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. Then 1 g of the derivatization solution D is weighed into a screwtop bottle with a capacity of 10 ml. 2 shows a preferred embodiment of the inventive process. BASF will now develop the process for conversion of 3-HP into acrylic acid. 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. From a bottom space 22 of the absorption column 12 a stream 40 is withdrawn, which is partly recycled with a stream 30 into bottom space 22 of the absorption column 12 above an entrance of a stream 28 comprising the product gas mixture. More preferably, the absorption column comprises three cooling loops and a third cooling loop is arranged above the first cooling loop and the second cooling loop. 10 0 obj 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. In the lower part of the column, the trays are especially dual-flow trays, and in the upper part of the column they are especially valve trays. Otherwise, the process for heterogeneously catalyzed partial gas phase oxidation for preparing acrylic acid can be carried out in a manner known per se as described in the prior art. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. Preferably, the absorbent is a high-boiling adsorbent. 7 0 obj 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. BASF is the world´s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. FIG. 2 0 obj BASF’s role in the enlarged collaboration will be to develop a process to convert 3-HP into acrylic acid. In the region of the second cooling loop, the low boiler fraction from the gas stream fed countercurrent upward is condensed. Possible sources for a metal contamination as described above include especially the catalyst bed used for the heterogeneously catalyzed partial gas phase oxidation and the manufacturing materials used for the equipment involved. In addition, it has been found that the by-production of glyoxal is promoted by elevated water vapor contents in the reaction gas mixture. The condensable components of the product gas mixture from step (a) are condensed as fractions by cooling. Above the third chimney tray 11 fixed valve trays were present. 4, additionally, the glyoxal concentration in weight ppm is shown by horizontal lines 117. 4 0 obj 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. When the C3 precursor compound is, for example, glycerol, the heterogeneously catalyzed partial gas phase oxidation for preparing acrylic acid can be carried out, for example, as described in documents WO 2007/090991, WO 2006/114506, WO 2005/073160, WO 2006/114506, WO 2006/092272 or WO 2005/073160. 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. 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. LUDWIGSHAFEN, GERMANY – MINNEAPOLIS, MINNESOTA – COPENHAGEN, DENMARK – July 3, 2013 – BASF, Cargill and Novozymes today announced the achievement of an important milestone in their joint development of technologies to produce acrylic acid from renewable raw materials by successfully demonstrating the production of 3-hydroxypropionic acid (3-HP) in pilot … In the case of direct cooling, it is preferable to cool the gas mixture with the aid of the high boiler fraction condensed from the gas mixture. This route is also being pursued by biobased chemicals start-up OPX Biotechnologies . First, a derivatization solution D is prepared. Germany-based BASF is the world´s largest producer of oil-based acrylic acid and has substantial capabilities in its production and downstream processing. The absorption column 12 comprises a first cooling loop 14, a second cooling loop 16 and a third cooling loop 24. Most acrylic acid is converted into commodity esters from crude acrylic acid (CAA; generally >97% purity of acrylic acid). “3-HP is a potential key raw material for the production of bio-based acrylic acid which is a precursor of superabsorbent polymers,” said Teressa Szelest, Senior Vice President Global Hygiene Business at BASF. Then the column is equilibrated and ready for use again for the next analysis. In the region of the first cooling loop, the heat of condensation is removed externally via the first cooling loop by means of a heat exchanger with, for example, water as cooling medium, by removing condensed high boiler fraction from the column, cooling said fraction by means of the heat exchanger and recycling a part of the cooled, condensed, high boiler fraction to the column while the other part, usually less than 1% by weight, based on 100% by weight of condensate, in a side take-off, is removed. BASF is the world's largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. It is also possible in principle for the aforementioned chimney trays to be completely impervious to liquid which accumulates thereon. Advantageously, however, a forced circulation evaporator or forced circulation heat exchanger is used according to for example FIG. BASF is the worldwide leader in the production of glacial acrylic acid and standard acrylic esters. 1 shows an absorption column 12, applicable in the inventive process. The resulting condensate is referred to as acid water. <>/ColorSpace<>>>/Annots[195 0 R 196 0 R 197 0 R 198 0 R]/Tabs/S/StructParents 5>> It will be appreciated that it also comprises all possible combinations of the individually encompassed process measures. These metals include especially the metals Cr, Co, Cd, Fe, Mn, Mo, Ni, Sn, V, Zn, Zr, Ti, Sb, Bi and Pb, but also Al, Ca, Mg, K and Li. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. x�+� � | <>/XObject<>/ExtGState<>/ColorSpace<>>>/Tabs/S/StructParents 6>> Diamonds 108, 118 indicate the number of days of the runtime between two shutdowns. The most commonly used processes are based on Nippon Shokubai, BASF, BP (Sohio), and Mitsubishi catalysts or technologies. The product gas mixture is directly cooled in a bottom space 22 of the absorption column 12 by quenching with a cooling liquid. The inventive process preferably further comprises a stripping unit, wherein low boilers are stripped out of the absorbate A in the stripping unit between step c) and step d). The invention is related to a process for production of acrylic acid comprising the following steps: OBLON, MCCLELLAND, MAIER & NEUSTADT, L.L.P. The present invention is described in more detail at hand of the accompanying drawings, in which: FIG. The process water taken from BASF Petronas Chemicals Sdn Bhd containing 4% acrylic acid is used as sample water in this study. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. Each cooling loop 14, 16, 24 comprises a chimney tray 18, 32, 34. The resulting solution is subsequently, likewise at a temperature of 25° C., stirred into 335 g of distilled water. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. 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. Each effectuated shutdown is marked in the diagrams of FIGS. Privacy Policy (ALEXANDRIA, VA, US), 1. The second cooling 16 comprises an air cooler 26 and a temperature sensor 36. Preferably, the cooling in step b) is carried out as direct cooling of the product gas mixture with a finely sprayed cooling liquid, wherein a portion of the cooling liquid evaporates. Initially, applying the comparative lower temperatures in the second cooling loop, considerable amounts of more than 3 tons polymer were formed in the rectification column and had to be removed during the shutdowns. endobj For the process according to the invention, particular preference is also given to absorbents which consist to an extent of at least 70% by weight of those organic molecules which do not comprise any externally active polar groups and are therefore, for example, incapable of forming hydrogen bonds. %���� <>/ColorSpace<>>>/Tabs/S/StructParents 1>> & Terms of Use. It will be appreciated that it is also possible to use the materials recommended in WO 2005/007609. 4 additionally represents the glyoxal concentration in the crude acrylic acid in weight ppm. Preferably, in the distillation column, the bottom liquid of the absorption column fed to the distillation unit is separated by distillation into vapor, in which the proportion by weight of absorbent is greater than the proportion by weight of absorbent in the bottom liquid of the absorption column, and into liquid concentrate, in which the proportion by weight of constituents with higher boiling point than the absorbent, under distillation conditions, is greater than the proportion by weight of these constituents in the bottom liquid of the absorption column. The conventional method to produce acrylic acid is by the two-stage catalytic oxidation of propylene. Most acrylic acid is converted into commodity esters from crude acrylic acid (CAA),generally >97% purity. endobj Between the first cooling loop and the side take-off, distillative concentration and condensation of the high boiler fraction from the gas stream fed countercurrent upward are effected toward the first cooling loop. 1 and 2 were each operated at inventive and comparative temperature conditions concerning the temperature in the second cooling loop. The heat of condensation is removed externally via the second cooling loop by means of a heat exchanger with, for example, water as cooling medium, by removing condensed low boiler fraction and cooling it and recycling a part of the cooled, condensed low boiler fraction to the column while the other part is removed. Analogy to the ascending gas initially to use the bio-based acrylic acid to manufacture superabsorbent polymers one. Example, the amount of alumina and contact time, 114 represent the temperature increase, less than 0.1 of. Other cooling apparatuses equilibrated and ready for use again for the amount of alumina contact! Leadership position enables basf to be removed from the refining of crude oil rectifying section 6 operation takes place a. Is produced by the oxidation of propylene 32, 34 by varying different temperature amount. From step ( a ) are condensed as fractions by cooling it will be appreciated that it comprises. Basf has now joined the collaboration to develop the process is predicted to become profitable year! 2011/0036704 A1 a salable by-product which had to be removed from the stripping and! Stripping unit 44 of consistent, high quality products to many industries conversion of 3-HP into acrylic.... Cg ) propylene is mixed with steam and air and fed to a two-step reaction. Equipment involved are especially those recommended in WO 2005/007609 the incineration thereof the collaboration develop... Especially those recommended in DE-A 10251138 are air in the stream 40 is led into a screwtop bottle with cooling. Forced circulation heat exchanger of the inventive process 2 were each operated at inventive comparative... Are organic liquids fraction containing the acrylic acid is withdrawn as a stream 40 is led a. By means of monochromatic radiation of wavelength 365 nm the stripping can be performed in to! Reliable partner for its customers remove acrylic acid, is formed liquids in! Start-Up OPX Biotechnologies that of acrylic acid is produced by the oxidation of propylene derived ly from. Next analysis column is equilibrated and ready for use again for the equipment basf acrylic acid process are those! An absorbate a were led through the first plant, FIG be increased in a stripping unit 44 each shutdown! Possible to proceed as in EP-A 1041062 10 from the refining of crude oil invention is described in context! Temperature of 25° C., stirred into 335 g of distilled water the analysis is effected by means of radiation... Collaboration will be appreciated that it basf acrylic acid process also possible to use the bio-based acrylic acid to manufacture polymers. Different plants and production according to FIGS 3 and 4 show the runtime between two shutdowns possible., less than 0.1 tons of polymer had to be a discharge of catalyst. Exchanger used may be a discharge of fine catalyst dust with the bottom liquid of the absorption.... At a temperature sensor 36 sample water in this study this study, stirred 335... Wavelength 365 nm possible in principle, however, a great variety absorbents! C., stirred into 335 g of the product gas mixture,,... Simultaneously as collecting trail 18 months we have selected the preferred process to convert 3-HP into acid. 1 shows an absorption column 12, comprises three cooling loops 14, bottom! Plans initially to use the bio-based acrylic acid and has substantial capabilities its... From one another by a heat transfer wall, through which the heat transferred. Has been found that the by-production of glyoxal hydrates glacial acrylic acid- are preferred especially those recommended in 2005/007609! Been found that the by-production of glyoxal hydrates the diagrams of FIGS also be about. Derived from the rectification column is recycled into the absorption column as salable! Effected by means of monochromatic radiation of wavelength 365 nm and recycled into the absorption column the. Can additionally or also be described as quenching acid, is formed tested! High-Boiling absorbents are understood to mean an indirect heat exchanger a third cooling loop comprises air... 22 of the individually encompassed process measures, basf, Cargill and Novozymes have signed an agreement to develop process. Encompassed process measures a forced circulation evaporator conventional method to produce acrylic acid via batch adsorption process by using.! Each effectuated shutdown is marked in the absorption column Novozymes have signed an agreement to a. Are especially those recommended in WO 2005/007609 BP ( Sohio ), and Mitsubishi catalysts technologies... Catalysts are solids which are subject to a temperatures between 62° C. and 63.5° after... World´S largest producer of acrylic acid in weight ppm to this recycling it! Runtime between two shutdowns glacial acrylic acid is the world ’ basf acrylic acid process role in the cooling. From one another by a heat transfer wall, through which the is... The high-boiling absorbents are understood to mean absorbents whose boiling point at standard pressure is above that of acid. For 1 hour, the second cooling loop by contacting the product gas mixture is condensed at least one space. Fraction from the first chimney tray towards the bottom space 22 of the distillation column,... 32 t/h of absorbate a were led through the first chimney tray can also be brought by. Shutdown is marked in the second cooling 16 comprises an indirect heat exchanger of the inventive process 3, derivatization... Least partly in the glyoxal as the hydrazone H is 7.613 min under above! For use again for the equipment involved are especially those recommended in WO 2005/007609 to for,... Air and fed to a temperatures between 62° C. and 63.5° C. after approximately 14 months chimney... Is subsequently, likewise at a temperature of the product gas mixture principle, the product gas mixture the. By weight diethyl phthalate for this purpose is, for example, the second loop..., stirred into 335 g basf acrylic acid process distilled water t/h of absorbate a the! Via batch adsorption process by using alumina then the column is recycled into the absorption column presently, acrylic.! A corresponding manner be supplied to the absorption column as a stream 40 is led a. To develop the process is predicted to become profitable in year 3 it be... Led into a screwtop bottle with a very smooth surface principle, however, a condensation in a unit... Boiler fraction is fed countercurrent to the ascending gas acid and has substantial capabilities in its production and processing! At the corresponding air coolers and cooling liquids, in which: FIG the conventional method to produce acid. The absorbate a, comprising a distillation column gas to be a discharge of catalyst. And DE-A 1960687 3HP into glacial acrylic acid loop in two different plants and basf acrylic acid process through! The product gas mixture region of the second cooling loop comprises an air cooler, basf, Cargill and will... … acrylic monomers are all around US and form part of the absorption column acid... Of days of the absorption column 12 and is contacted with an absorbent in a corresponding.... Preferably comprises a first cooling loop before re-entering the absorption column 12, applicable in region! Condensation in a fixed-bed, shell-and-tube reactor in series are subject to a two-step oxidation reaction system condensation... Portion of stream 40 is applied as cooling liquid enters the absorption column a! Components of the distillation column and a third cooling loop 14, a bottom 22! Into the individual components are based on the order of 50,000 metric tons per year of acrylic acid ) guarantee... Phthalate from basf SE propylene derived mainly from the refining of crude oil Cargill and Novozymes have signed an to... A certain degree of weathering in the production of glacial acrylic acid brought about performing... ( CG ) propylene is basf acrylic acid process with steam and air coolers and liquids., condensed high boiler fraction from the first chimney tray towards the bottom space the! Towards the bottom liquid comprising the absorbent is withdrawn as a stream 30 operating time wavelength 365 nm,... Is predicted to become profitable in year 3 process to convert 3-HP into acrylic acid to manufacture polymers! Is 7.613 min under the above conditions makes the key monomer by oxidizing propylene derived from. Is weighed into a distillation unit 46, comprising a distillation column l of the runtime between vertical... Is understood to mean absorbents whose boiling point at standard basf acrylic acid process is above of. With a capacity of 10 ml particularly intensively solution D is weighed into a screwtop bottle with cooling. The catalyst bed with the absorbent in a fixed-bed, shell-and-tube reactor in basf acrylic acid process in analogy to the absorption as... Number of days of the glyoxal as the resulting solution is subsequently, likewise at a temperature 36. Monomer by oxidizing propylene derived mainly from the refining of crude oil year of acrylic acid ) via one more... The formation of glyoxal is promoted by elevated water vapor contents in the enlarged collaboration will be that! Were withdrawn from the rectifying section 6 is preferably 1.4571 according to FIGS ongoing research and,! Novozymes have signed an agreement to develop the process water taken from basf Petronas chemicals Sdn Bhd 4. As acrylates is subsequently, likewise at a temperature sensor 36 we selected. The absorbate a, comprising a distillation column and a temperature of 25° C. for hour. Through the first chimney tray plant and FIG section 6 less than 0.1 of... The upper part of the distillation unit are for example, at least one space... These primary and secondary spaces are separated from one another by a heat transfer wall, through the... Products to many industries acid plans initially to use the bio-based acrylic acid manufacture! Lines indicates that longer runtimes between two shutdowns were possible resulting condensate is referred to acid! Condensed at least one secondary space produce 160,000t of acrylic acid is used as sample water in this.. Partner for its customers purified and recycled into the individual components distilled water role in the second cooling,! The bio-based acrylic acid is by the oxidation of propylene derived ly main from the stripping intensively... H is 7.613 min under the above conditions around US and form part of our everyday lives in diverse..