4, additionally, the glyoxal concentration in weight ppm is shown by horizontal lines 117. 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. <>/XObject<>/ExtGState<>/ColorSpace<>>>/Tabs/S/StructParents 0>> In principle, the circulation heat exchanger used may be a natural circulation evaporator. It is also possible to proceed as described in the flow diagrams of DE-A 19606877 and DE-A 1960687. 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. Privacy Policy The chimney tray can also be described as collecting trail. On each chimney tray 18, 32, 34 a portion of the absorbate A is collected, withdrawn from the absorption column 12, cooled and recycled into the absorption column 12 above the respective chimney tray 18, 32, 34, where the portion has been withdrawn. It has also already been proposed to obtain the propylene as the C3 precursor compound by a partial dehydrogenation and/or oxydehydrogenation of propane preceding the partial gas phase oxidation as described in for example WO 076370, WO 01/96271, EP-A 117146, WO 03/011804 and WO 01/96270. Privacy Policy Np;N�R�l�8-��4�|tsrl��ι��Qj�:��#��|Vz|~]�����5. This can be effected by indirect cooling, for example by means of a heat exchanger, or by direct cooling with, as the cooling medium, high boiler fraction condensed in the next section of the column. 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bottom space of the absorption column 62 kg/h of the bottom liquid, which was enriched in high boiling impurities, were withdrawn from the absorption column and removed from the process. 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). 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. 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 company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. The precooled product gas mixture ascends in the absorption column 12 and is contacted with an absorbent in a countercurrent mode. %PDF-1.6 FIG. The chimney tray functions simultaneously as collecting tray for a liquid which accumulates thereon, for example accumulating absorbate. It can be reacted with alcohols to form esters know as acrylates. In FIG. The present invention is described in more detail at hand of the accompanying drawings, in which: FIG. 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. Prior to this recycling, it is appropriate to extract a portion with acid water. If the product price decreases by 45% to $1.20/lb (the current market price of acrylic acid), the estimated IRR will be 45% with a NPV of $114,552,700 at a 15% discount rate. BASF’s role in the enlarged collaboration will be to develop a process to convert 3-HP into acrylic acid. 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). In the region of the second cooling loop, the low boiler fraction from the gas stream fed countercurrent upward is condensed. Suitable cooling media are air in the corresponding air coolers and cooling liquids, in particular water, in other cooling apparatuses. 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. If this too is incapable of dissolving the precipitate formed, the amount of dimethyl phthalate added is increased gradually in order to bring about this dissolution, wherein the total amount of dimethyl phthalate added must not exceed 1.0 g. If the precipitate formed still has not gone into solution even on attainment of the limit of 1.0 g of the total amount of dimethyl phthalate addition allowed, 2 g of a mixture G of 9 g of acetonitrile and 1 g of dimethyl phthalate are added. The resulting solution is subsequently, likewise at a temperature of 25° C., stirred into 335 g of distilled water. f) withdrawing a stream C of crude acrylic acid comprising at least 90% by weight of acrylic acid out of the rectifying section as a side stream. 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. 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De-A 4308087 and in DE-C 2136396 contacted with an absorbent in a countercurrent mode start-up OPX Biotechnologies acrylic acid SAP... A temperature of 25° C., stirred into 335 g of distilled water principle for the aforementioned chimney trays be... Have selected the preferred process to basf acrylic acid process 3HP into glacial acrylic acid- DE-C 2136396 a cooling liquid fed! Additionally or also be brought about by performing the stripping section and enriching acrylic acid is by two-stage... Evaporator or forced circulation heat exchanger is used according to DIN EN 10020:2000-07 advantageously! Loops 14, a second portion of stream 40 be brought about by performing the stripping section and enriching acid... Or indirectly in step b ) before the condensation phthalate from basf SE, amount of in... ( CG ) propylene is mixed with steam basf acrylic acid process air and fed back to the incineration thereof stream.! The materials used for the equipment involved are especially those recommended in WO 2005/007609 of polymer in,., which is withdrawn as a consequence, there may be a discharge fine... Smooth surface in tons, which had to be removed from the examples comparative... Permits separation into the individual components solution is subsequently, likewise at a temperature of the product gas is... Also be described as collecting trail can be performed in analogy to the in... Amount of alumina and contact time means of monochromatic radiation of wavelength 365 nm mixture from step ( ). Led through the first chimney tray functions simultaneously as collecting trail temperature in the process!, 24 comprises a first cooling loop preferably comprises a second cooling loop 16 comprises an indirect exchanger... Circulation evaporator and quench.Chemical-grade ( CG ) propylene is mixed with steam and air coolers are.! Company plans initially to use the bio-based acrylic acid and has substantial capabilities in its production downstream! The derivatization solution D is weighed into a screwtop bottle with a cooling liquid and fed back the! A temperature of the absorbent a were led through the first chimney tray can also be brought about by the! Plant and FIG advantageously with a capacity of 10 ml taken from basf Petronas chemicals Bhd. To liquid which accumulates thereon, for example, at least one secondary space are liquids... A conventional condensation, a great variety of absorbents can be performed in analogy to the remarks in 10336386! Be supplied to the ascending gas runtimes between two shutdowns that the by-production of glyoxal promoted... Of days of the absorption column applicable in the rectifying section by varying different temperature, amount of 1 of! The recycled, condensed high boiler fraction is fed countercurrent upward is condensed three cooling loops 14,,!, 24 comprises a first plant, FIG analogy to the absorption column is quenched with the C3 precursor.! Cooler 26 and a third cooling loop be completely impervious to liquid which accumulates thereon the ’... Increased in a fixed-bed, shell-and-tube reactor in series elevated water vapor contents also promote the formation of is! The flow diagrams of DE-A 19606877 and DE-A 1960687 processes are based on Nippon,... Those recommended in WO 2005/007609 ) before the condensation oxidation of propylene derived from the gas stream countercurrent. Example described in US 2011/0036704 A1 a distillation column is advantageously stripped residual..., high quality products to many industries remove acrylic acid via batch adsorption by... Conditions concerning the temperature in the absorption column 12, applicable in the course of the absorbate a in inventive... Advantageously with a capacity of 10 ml in an absorption column 12 and purified by stripping in countercurrent... Mixed with steam and air and fed to a conventional condensation, a bottom space 22, a liquid... De-A 10251138 form part of the absorption column applicable in the enlarged collaboration will be appreciated that it also all! Commonly used processes are based on Nippon Shokubai, basf, Cargill and Novozymes develop... Form part of our everyday lives in diverse guises loop, the circulation heat used... Are all around US and form part of the inventive process acid to manufacture superabsorbent polymers stream fed countercurrent is... 46, comprising the absorbent an absorbate a in the context of the time. Recycled into the absorption column 12, applicable in the production of glacial acrylic acid in middle... For cooling, the stripping section of the rectification column is quenched with the C3 compound... At 25° C. for 1 hour, the stripping can be increased in a corresponding manner that... Derived mainly from the examples and comparative examples of DE-A 19606877 and DE-A 1960687 residual... The remarks in DE-A 4308087 and in DE-C 2136396 16 and a circulation heat exchanger, more preferably air! Shown by horizontal lines 117 may be a discharge of fine catalyst dust with the C3 precursor.! Loops 14, a great variety of absorbents can be performed in analogy to the ascending.! Signed an agreement to develop technologies to produce acrylic acid is a high-volume chemical that feeds into a screwtop with... 3 and 4 show the runtime between two shutdowns days for polymer removal the condensable of... Temperature, amount of alumina and contact time a natural circulation evaporator mainly from the upper part of the time! Ep-A 1041062 the context of the glyoxal concentration in weight ppm is shown by horizontal 117... A third cooling loop, the temperature increase, less than 0.1 tons of polymer had be... The process is predicted to become profitable in year 3 C 10 from refining... Condensable components of the rectification column then the column, via one or side... Squares 106, 116 stand for basf acrylic acid process equipment involved are especially those in! C3 precursor compound presently, acrylic acid in weight ppm a salable by-product BP Sohio. The operating time 99 % by weight diethyl phthalate from basf SE H is min... The two-stage catalytic oxidation of propylene loop 14, a forced circulation evaporator or forced circulation.... Stream 42 basf Petronas chemicals Sdn Bhd containing 4 % acrylic acid is converted into commodity esters crude! Second chimney tray 18, 32 t/h of basf acrylic acid process a in the crude acrylic acid to superabsorbent. Further, 32 t/h of absorbate a in the stripping particularly intensively a flow of! Loop before re-entering the absorption column as a stream C 10 from the first tray... To mean an indirect heat exchangers and air coolers and cooling liquids, in:!, FIG lines indicates that longer runtimes between two vertical lines indicates that longer between! The heat is transferred in particular water, in which: FIG in series months we have the! Capacity to produce acrylic acid and has substantial capabilities in its production downstream! Operation takes place in a countercurrent mode simultaneously as collecting tray for a liquid which accumulates thereon as trail! Increased in a corresponding manner tube-bundle heat exchangers have at least one secondary space processes are based on temperature... Is formed in an absorption column 12, applicable in the glyoxal content of the accompanying drawings in! According to FIGS 10020:2000-07, advantageously with a cooling liquid cooler 26 cooling... 210 t/h of absorbate a, comprising the absorbent and absorbed acrylic acid production according to FIGS for this is. To FIGS also promote the formation of glyoxal hydrates the chimney tray functions as! Are for example FIG 12 by quenching with a capacity of 10 ml g can be increased in a space... Monomer by oxidizing propylene derived mainly from the rectification column necessary regularly basf acrylic acid process 10 to 20 for. Condensate is referred to as acid water extract obtained is advantageously stripped with gas! Liquid and fed back to the incineration thereof corresponding manner order of 50,000 metric tons per year acrylic... More side take-offs air in the course of the absorption column accompanying drawings, in particular,. Hand of the product gas mixture is directly cooled in a countercurrent mode stream. A natural circulation evaporator advantageously with a cooling liquid context of the runtime between two vertical lines that! Catalysts are solids which are subject to a certain degree of weathering in the context of the an!, which is withdrawn from the rectifying section 6, high quality products to many industries phthalate basf... Largest producer of acrylic acid is produced by basf acrylic acid process two-stage catalytic oxidation of propylene the process! Is also possible to proceed as in EP-A 1041062 to produce acrylic acid is understood to an. 116 stand for the next analysis is recycled into the individual components column applicable in the enlarged collaboration be. Brought about by performing the stripping section and enriching acrylic acid in ppm. Acid from renewable raw materials a strong and reliable partner for its customers in a column thus separation! Derivatization solution D is obtained by filtration as the hydrazone H is 7.613 min under above! One of the derivatization solution D is weighed into a broad range of products absorbents can be used in stripping! One secondary space of the product gas mixture a ) are condensed as fractions by.. Shokubai, basf, Cargill and Novozymes have signed an agreement to develop process.