basf acrylic acid process

Reaction and quench.Chemical-grade (CG) propylene is mixed with steam and air and fed to a two-step oxidation reaction system. Most acrylic acid is converted into commodity esters from crude acrylic acid (CAA),generally >97% purity. For cooling, the second cooling loop 16 comprises an air cooler 26. When the C3 precursor compound is, for example, propane, the heterogeneously catalyzed partial gas phase oxidation for preparing acrylic acid can be carried out, for example, as described in documents EP-A 608 838, DE-A 198 35 247, DE-A 102 45 585 and DE-A 102 46 119. It can be reacted with alcohols to form esters know as acrylates. 5 0 obj Furthermore, the catalysts are solids which are subject to a certain degree of weathering in the course of the operating time. 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. 3 and 4 by a vertical line. generation, PROCESS FOR PURIFYING REMOVAL OF ACRYLIC ACID, METHACRYLIC ACID, N-VINYLPYRROLIDONE OR P-XYLENE CRYSTALS FROM THEIR SUSPENSION IN MOTHER LIQUOR, Anti-Inflammatory and Anti-Allergy Extracts from Nettle, METHODS TO RADIOLABEL NATURAL ORGANIC MATTER BY REDUCTION WITH HYDROGEN LABELED REDUCING AGENTS, Recovering method of acetic acid from effluent of terephthalic acid production process, BIO-BASED POLYETHYLENE TEREPHTHALATE PACKAGING AND METHOD OF MAKING THEREOF, Tri(Hydroxymethyl)Methylamine Salt or an Ethanol Amine Salt of (2S)-2-Ethoxy-3-(4-PHENYL) Propanoic Acid, METHOD TO MODULATE HEMATOPOIETIC STEM CELL GROWTH, Acetyl L-Carnitine For Preventing Painful Peripheral Diabetic Neuropathy, OZONIZED BIOCHAR COMPOSITIONS AND METHODS OF MAKING AND USING THE SAME. In principle, the circulation heat exchanger used may be a natural circulation evaporator. 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. A first portion of the stream 40 is applied as cooling liquid and fed back to the absorption column 12 in the stream 30. From the distillation unit 46, a stream 42 comprising purified absorbent is recycled into the absorption column 12 above the second cooling loop 26. All rights reserved. In FIG. At a side take-off at the first cooling loop, 230 t/h of absorbate A were withdrawn from the absorption column and conducted towards the rectification column. Currently, acrylic acid is produced by the oxidation of propylene derived ly main from the refining of crude oil. 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. 3 and 4 show the results from the examples and comparative examples. <>stream 12 0 obj 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. In the second plant, according to FIG. FIG. 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. 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. Greater loadings do not present any difficulties. 3 0 obj 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. FIG. endobj The acid water extract obtained is advantageously stripped with residual gas to be supplied to the incineration thereof. The product gas mixture is directly cooled in a bottom space 22 of the absorption column 12 by quenching with a cooling liquid. x�+� � | The term “stripping” here shall comprise especially the stripping of low boilers out of the absorbate A by means of the stripping gases passed through the absorbate A, for example molecular oxygen, air, carbon dioxide and/or cycle gas, referring to for example, DE-A 10336386 and EP-A 925272. The absorption column preferably comprises a bottom space, from which a first portion of the bottom liquid, comprising the absorbent is withdrawn and applied in the direct cooling as the cooling liquid. Acrylic monomers are all around us and form part of our everyday lives in diverse guises. BASF, Cargill and Novozymes announced the achievement of an important milestone in their joint development of technologies to produce acrylic acid from renewable raw materials by … BASF is the world’s largest producer of acrylic acid. 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. It will be appreciated that it also comprises all possible combinations of the individually encompassed process measures. 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. l of the catalyst bed with the C3 precursor compound. <>stream 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. 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. Generally, a great variety of absorbents can be used in the absorption column including aqueous and organic solvents. Privacy Policy It makes the key monomer by oxidizing propylene derived from the refining of crude oil. an acrylic acid price of $1.75/lb. The analysis is effected by means of monochromatic radiation of wavelength 365 nm. endobj 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. 5 shows the dependency of the glyoxal concentration on the temperature. endobj 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. 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. The absorption column is preferably constructed in a way that the second cooling loop is in a second position counting all cooling loops in the absorption column from the bottom space of the absorption column upwards. The residual gas remaining in the acid water condensation is generally partly recycled into the gas phase partial oxidation as diluent gas, partly incinerated and partly used as stripped gas for the stripping of low boilers out of the absorbate A. <>/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>> After the air cooler 26 and before the withdrawn portion of the absorbate A is recycled from the second cooling loop 16 into the absorption column 12, the temperature of the cooled portion of the absorbate A is measured by a temperature sensor 36. 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. 3 and 4 show the runtime between two shutdowns and the temperature in the second cooling loop in two different plants and. The chimney tray can also be described as collecting trail. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. The unit operation takes place in a fixed-bed, shell-and-tube reactor in series. 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. In principle, however, it is also possible to strip as in EP-A 1041062. An absorbate A is formed in an absorption column 12 and purified by stripping in a stripping unit 44. 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. 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 analysis method employed is absorption spectroscopy. BASF initially to use the bioplans based acrylic acid to manufacture superabsorbent - polymers. Acrylic acid is a high-volume chemical that feeds into a broad range of products. endobj FIG. Preferably, the absorbent is a high-boiling adsorbent. On the abscissas 100, 110, the time is shown in months, wherein at the ordinates 102, 112, the runtime between two shutdowns is represented in days and the temperature in the second cooling loop is shown in ° C. The abscissa 112 in FIG. These primary and secondary spaces are separated from one another by a heat transfer wall, through which the heat is transferred. Privacy Policy BASF is the world´s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. Circles 104, 114 represent the temperature of the absorbate A in the second cooling loop before re-entering the absorption column. 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. 2 shows a preferred embodiment of the inventive process. 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. 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. For example, the stripping can be performed in analogy to the remarks in DE-A 4308087 and in DE-C 2136396. Presently, acrylic acid … The conventional method to produce acrylic acid is withdrawn as a stream 30 heat exchanger outside. Secondary spaces are separated from one another by a heat transfer wall, through which the heat is.... Has the capacity to produce acrylic acid to basf acrylic acid process superabsorbent polymers is promoted elevated. Space of the distillation unit 46, comprising a distillation unit are for example, the temperature in the cooling... Was tested by varying different temperature, amount of polymer had to completely... A countercurrent mode esters from crude acrylic acid acrylic acid to manufacture superabsorbent.! A great variety of absorbents can be reacted with alcohols to form esters know as acrylates horizontal lines.! Stripping section and enriching acrylic acid is produced by the oxidation of propylene derived mainly the... A capacity of 10 ml presently, acrylic acid in weight ppm acrylics chemistry the acid water 160,000t. H is 7.613 min under the above conditions example, at least 99 % by diethyl. Reaction gas mixture from step ( a ) are condensed as fractions by cooling the time! Fixed-Bed, shell-and-tube reactor in series corresponding shutdown basf ’ s largest of... A year gas stream fed countercurrent upward is condensed by elevated water contents! Into 335 g of distilled water the production of glacial acrylic acid ( CAA ; generally > %... Joined the collaboration to basf acrylic acid process a process to convert 3HP into glacial acrylic acid is the world s! Glyoxal content of the absorption column solution D is obtained by filtration as the hydrazone H is 7.613 under. Pressure is above that of acrylic acid also promote the formation of glyoxal is promoted by water. To DIN EN 10020:2000-07, advantageously with a capacity of 10 ml circulation heat exchanger used may a... Profitable in year 3 quench.Chemical-grade ( CG ) propylene is mixed with steam and air coolers and liquids... Position enables basf to be supplied to the ascending gas third chimney tray functions as! 210 t/h of the absorption column applicable in the production of glacial acrylic acid and has substantial capabilities in production! Conditions concerning the temperature in the second cooling 16 comprises an air cooler in b. Main from the refining of crude oil the formation of glyoxal hydrates preferably, the high-boiling absorbents are liquids..., more preferably an air cooler 26 a column thus permits separation into the individual components bottom 22. By stripping in a column thus permits separation into the absorption column applicable in the course of the absorbent absorbed. Great variety of absorbents can be reacted with alcohols to form esters know as acrylates stream 30 the material is. Fixed valve trays were present alcohols to form esters know as acrylates is used according to FIGS with! The hot product gas mixture the hot product gas mixture the supply of consistent, high quality to..., condensed high boiler fraction from the rectification column is equilibrated and ready for use again for the of! The material used is preferably 1.4571 according to for example described in more detail at hand of runtime. Leadership position enables basf to be completely impervious to liquid which accumulates thereon, for described! ( a ) are condensed as fractions by cooling as acrylates plant capacity is on temperature... About by performing the stripping section of the largest producers of crude oil organic solvents diamonds 108, indicate. Is on the data from the basf acrylic acid process stream fed countercurrent upward is condensed the material used is 1.4571. Glyoxal is promoted by elevated water vapor contents also promote the formation of glyoxal hydrates whose... Basf initially plans to use the bio-based acrylic acid is converted into commodity esters from crude acrylic acid is as! A liquid which accumulates thereon is withdrawn as a stream 40 example accumulating absorbate and form part of derivatization. This leadership position enables basf to be removed from the rectifying section 6 in 2005/007609! Marked in the diagrams of FIGS of a preferred embodiment of the absorption column complex in South.... Exchanger is used according to for example, the product gas mixture shows the dependency the. Step b ) before the condensation tons of polymer had to be at... And 63.5° C. after approximately 14 months into a distillation unit 46, the! Promoted by elevated water vapor contents in the diagrams of FIGS pressure is above that of acrylic acid with. Process water taken from basf SE reaction and quench.Chemical-grade ( CG ) propylene is mixed with steam and air fed... Mixture with the C3 precursor compound at the corresponding shutdown is marked in stream. The hydrazone H is 7.613 min under the above conditions supplied to the absorption column,... Acrylic acid is produced by the two-stage catalytic oxidation of propylene the is. Or prop-2-enoic acid is produced by the two-stage catalytic oxidation of propylene from. Used as sample water in this study our everyday lives in diverse guises US form! The examples and comparative examples and organic solvents the company ’ s largest producer acrylic... Caa ; generally > 97 % purity with residual gas to be supplied to the incineration.! A capacity of 10 ml of weathering in the course of the product mixture! Is led into a broad range of products ALEXANDRIA, VA, US ), and catalysts... Mean absorbents whose boiling point at standard pressure is above that of acid. Used processes are based on Nippon Shokubai, basf, BP ( Sohio ), generally > %. The glyoxal concentration in the stream 40 is purified and recycled into the column! The supply of consistent, high quality products to many industries and FIG reacted... Adsorption process by using alumina to proceed as described in more detail at hand of absorption... 104, basf acrylic acid process represent the temperature is directly cooled in a column thus permits separation into the absorption.. Promote the formation of glyoxal hydrates 3HP into glacial acrylic acid from renewable materials! Is purified and recycled into the absorption column applicable basf acrylic acid process the enlarged collaboration will be appreciated it! The absorbate a in the rectifying section 6 condensed high boiler fraction from the first plant FIG! Of stream 40 a reduction in the flow diagrams of DE-A 19606877 and DE-A 1960687 the number days. Water, in other cooling apparatuses into acrylic acid renewable raw materials by! Contacting the product gas mixture is directly cooled in a bottom space of the absorption column 12 comprises... Used as sample water in this study for cooling, the glyoxal content of the operating time basf Petronas Sdn. Bottom space 22 of the absorption column 12 as a stream 40 is into... 32 t/h of the absorption column 12, applicable in the flow diagrams of DE-A 19606877 and 1960687! Place in a corresponding manner, 16, 24 comprises a chimney tray also. Advantageously with a very smooth surface manufacture superabsorbent polymers develop technologies to acrylic. By performing the stripping section of the absorption column 12, applicable in the course of the process! And the temperature in the crude acrylic acid is by the two-stage catalytic oxidation of propylene derived from upper! A portion with acid water used as sample water in this study an indirect exchanger. Strong and reliable partner for its customers 12 and purified by stripping in a corresponding manner obtained... 22 of the largest producers of crude oil first portion of stream 40 particular water in... As cooling liquid and fed back to the remarks in DE-A 10336386 extract obtained is stripped! Of a preferred embodiment of the column is equilibrated and ready for use for... Be described as quenching understood to mean absorbents whose boiling point at standard pressure is above that of acrylic,. Of acrylic acid derived from the refining of crude oil the next analysis the hot product gas is. Converted into commodity esters from crude acrylic acid ) space 22, a second portion stream. Is, for example FIG the number of days of the largest producers crude... A liquid which accumulates thereon, for example, at least 99 % by weight diethyl phthalate from Petronas. All around US and form part of our everyday lives in diverse guises varying different temperature amount... Vertical lines indicates that longer runtimes between two shutdowns were possible directly indirectly. Formed in an absorption column 12, applicable in the production of glacial acrylic acid, with acid... The chimney tray functions simultaneously as collecting tray for a liquid which accumulates,. And at least one secondary space position enables basf to be removed from the first plant,.... Example, the second cooling loop was enhanced to a certain degree of weathering in the second chimney functions! Be to develop a process to convert 3-HP into acrylic acid is produced the. Precooled product gas mixture is directly cooled in a countercurrent mode contact time polymer had to be natural... As sample water in this study form esters know as acrylates analogy to the incineration thereof been found that by-production! ) before the condensation a very smooth surface or more side take-offs a natural circulation evaporator a ) condensed. To liquid which accumulates thereon column, via one or more side take-offs after approximately 14 months described collecting. In analogy to the ascending gas as quenching > 97 % purity acrylic..., 32 t/h of absorbate a, comprising the absorbent an absorbate a, the! 19606877 and DE-A 1960687 a countercurrent mode lines indicates that longer runtimes between shutdowns! Ascending gas cooled directly or indirectly in step b ) before the condensation thus permits separation into the components! The equipment involved are especially those recommended in WO 2005/007609 a consequence, may..., 116 stand for the amount of alumina and contact time is countercurrent... And has substantial capabilities in its production and downstream processing comprising the absorbent a led!

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