Purification Or Recovery Per Se Patents (Class 562/600)
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Patent number: 7981255Abstract: There is provided a method for rectifying a vinyl compound liquor. The method includes the steps of a) providing a rectification column operated at a temperature and pressure and b) feeding the vinyl compound liquor to be rectified into the rectification column, wherein the pressure of the rectification column and the temperature of the fed vinyl compound liquor are controlled, such that the temperature of the fed vinyl compound liquor ranges from its bubble point at the pressure of the rectification column to 10° C. lower than the bubble point.Type: GrantFiled: September 26, 2007Date of Patent: July 19, 2011Assignee: Shanghai HuaYi Acrylic Acid Co., Ltd.Inventors: Jingming Shao, Jun Yin, Shuju Liu, Xiaodong Chu, Shengxian Xu
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Publication number: 20110172462Abstract: An improved process for the manufacture of technical grade (meth)acrylic acid, e.g., acrylic acid, the process comprising producing a hydrated reaction product from the gas-phase oxidation of at least one (meth)acrylic acid precursor, e.g., propylene, followed by first dehydrating and then concentrating the reaction product, the improvement comprising controlling at least one of the water, acetic acid and (meth)acrylic acid content of the reaction product during the purification of the reaction product using on-line, near IR spectroscopy.Type: ApplicationFiled: September 18, 2009Publication date: July 14, 2011Applicant: Arkema Inc.Inventors: Timothy D. Ligon, Olan S. Fruchey, Christopher Reeves, Fungau Ho, Roger L. Roundy, William G. Etzkorn, Mahmood N. A. Jawaid, Patrick M. Wiegand
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Publication number: 20110166304Abstract: The present invention relates to a process for preparing unsaturated aldehydes or unsaturated carboxylic acids by heterogeneous catalytic gas phase oxidation of unsaturated or saturated hydrocarbons, comprising the process steps of: i) providing a gas mixture comprising a saturated hydrocarbon and catalytically dehydrogenating the saturated hydrocarbon in the gas phase to obtain a gas mixture comprising an unsaturated hydrocarbon in a dehydrogenation reactor having a dehydrogenation catalyst material; or ii) providing a gas mixture comprising oxygen and an unsaturated hydrocarbon; iii) catalytically oxidizing the unsaturated hydrocarbon obtained in process step i) or provided in process step ii) in the gas phase to obtain a gas mixture comprising an unsaturated aldehyde in a first oxidation reactor having a first oxidation catalyst material; wherein at least one of the reactors selected from the dehydrogenation reactor, the first oxidation reactor and the second oxidation reactor comprises at least one foam bType: ApplicationFiled: July 29, 2009Publication date: July 7, 2011Inventors: Horst-Werner Zanthoff, Nicole Brausch, Franz-Felix Kuppinger, Jorg Sauer, Andreas Sabbagh, Dennis Fruhling, Markus Weber, Oliver Becker
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Patent number: 7964689Abstract: The invention relates to a superabsorbent polymer that includes a (meth)acrylic acid made by a process that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The superabsorbent polymer according to the present invention includes an process to make (meth)acrylic acid, the apparatus suitable for implementing the process, and the use of the apparatus for the production of (meth)acrylic acid characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement, thereby providing an improved superabsorbent polymer.Type: GrantFiled: September 13, 2010Date of Patent: June 21, 2011Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Axel Kobus, Stefan Gross, Hans-Rolf Lausch, Torsten Balduf, Roland Fornika, Guenther Bub
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Patent number: 7964379Abstract: A process for producing ethanol including a combination of biochemical and synthetic conversions results in high yield ethanol production with concurrent production of high value coproducts. An acetic acid intermediate is produced from carbohydrates, such as corn, using enzymatic milling and fermentation steps, followed by conversion of the acetic acid into ethanol using esterification and hydrogenation reactions. Coproducts can include corn oil, and high protein animal feed containing the biomass produced in the fermentation.Type: GrantFiled: January 26, 2010Date of Patent: June 21, 2011Assignee: ZeaChem, Inc.Inventors: Dan Verser, Timothy J. Eggeman
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Publication number: 20110124834Abstract: A process for starting up a separating process for purifying removal of acrylic acid crystals from a suspension S of crystals thereof in mother liquor with a hydraulic wash column which has a crystal melt circuit including crystal melt space, and a process space and a distributor space which are separated by an end with passages connecting the two spaces, in which the crystal bed is formed for the first time by first filling the crystal melt circuit and, at least partly, the process space with an acrylic acid-comprising startup liquid whose acrylic acid crystal formation temperature is less than or equal to the temperature of the suspension S increased by 15° C.Type: ApplicationFiled: October 4, 2010Publication date: May 26, 2011Applicant: BASF SEInventors: Jörg HEILEK, Dirk Litters, Klaus Joachim Müller-Engel
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Patent number: 7947845Abstract: A process for purifying removal of acrylic acid, methacrylic acid, N-vinylpyrrolidone or p-xylene crystals from their suspension in mother liquor by means of a wash column with forced transport, whose shell of the process chamber is a metal wall, the wash column additionally being enveloped by a thermal insulation material having a water vapor barrier and a specific heat flow of >0.1 W/m2 and <10 W/m2 flowing into the process chamber through the metal wall of the wash column.Type: GrantFiled: July 9, 2008Date of Patent: May 24, 2011Assignee: BASF SEInventors: Joerg Heilek, Ulrich Hammon, Klaus Joachim Mueller-Engel, Dieter Baumann
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Publication number: 20110105708Abstract: A method is provided herein for purifying (meth)acrylic acid to provide a purified (meth)acrylic acid product having a low aldehyde concentration and not more than 0.2 wt % water. One embodiment of the method includes distilling (meth)acrylic acid in the presence of an aldehyde treating compound. Another embodiment of the method includes also distilling crude (meth)acrylic acid in the presence of a reactive drying agent. (Meth)acrylic acid produced in this manner is especially suitable for use in specialty (meth)acrylic acid polymers, such as for example superabsorbent polymers, binders, and ethylene-(M)AA copolymers.Type: ApplicationFiled: October 28, 2010Publication date: May 5, 2011Inventors: Abraham Benderly, Michael Stanley DeCourcy, Alan Sopchik
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Publication number: 20110077424Abstract: The present invention provides a method for extractive recovery and conversion of selected compounds, such as methacrylic acid (MAA) and 2-methacrylamide (MAM), from a stream derived from purification of methyl methacrylate (MMA) or methacrylic acid (MAA) produced via a conventional ACH route process.Type: ApplicationFiled: September 13, 2010Publication date: March 31, 2011Inventors: Andrew M. Lemonds, Jinsuo Xu
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Patent number: 7897814Abstract: Disclosed is a method for extracting methacrylic acid, in which an extraction solvent is added to a methacrylic acid aqueous solution for transferring methacrylic acid to the extraction solvent. In this method, a solvent containing t-butyl methacrylate is used as the extraction solvent.Type: GrantFiled: December 26, 2006Date of Patent: March 1, 2011Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Tohru Endoh, Kazunori Matake, Shigeho Tanaka, Haruki Sato
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Publication number: 20110046297Abstract: The present invention relates to a method for purifying an unpurified phase, containing a target product, preferably (meth)acrylic acid, water, and at least one impurity differing from the target product and from water comprising: a) crystallizing the target product and waters; b) separating the crystals from the mother liquor created in step a); c) melting at least part of the separated crystals to form a melt; and d) recycling at least part of said melt to step b). The invention further relates to a method for the production of a purified phase, containing a target product and water, a method for the production of a polymer based on (meth)acrylic acid, polymers that may be obtained by means of said method, chemical products, such as fibers or molded bodies, and the use of polymers.Type: ApplicationFiled: March 11, 2009Publication date: February 24, 2011Inventors: Axel Hengstermann, Franz-Felix Kuppinger, Jorg Leistner, Jurgen Mosler, Peter Jansens
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Patent number: 7892403Abstract: A condenser includes: a top face of a tube plate on which acrylic acid may be condensed inside the condenser; a spray for spreading a polymerization inhibitor on the tube plate; a first polymerization inhibitor supply tube for supplying the polymerization inhibitor to the spray; and a supporter for supporting the spray at a predetermined position. The supporter supports the first polymerization inhibitor supply tube outside the condenser. The condenser allows a stable continuous operation for a long period of time by preventing polymerization of an easily polymerizable compound in the condenser into which a vapor of an easily polymerizable compound is supplied with a simple structure thereof.Type: GrantFiled: September 7, 2004Date of Patent: February 22, 2011Assignee: Mitsubishi Chemical CorporationInventors: Shuhei Yada, Yasushi Ogawa, Yoshiro Suzuki, Kimikatsu Jinno
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Patent number: 7820860Abstract: Methods for racemate separation for compound-forming substances. In this method, at least one fraction which is enriched with an enantiomer is produced in one method step. Finally, a preferred crystallization is carried out on the fraction.Type: GrantFiled: August 17, 2006Date of Patent: October 26, 2010Assignee: Max-Planck-Gesellschaft Zur Forderung Der Wissenshaften E.V.Inventors: Andreas Seidel-Morgen-Stern, Heike Lorenz, Daniel Polenske
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Patent number: 7803969Abstract: The invention relates to a process for the purification of (meth)acrylic acid in a process stage that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The process according to the invention, the apparatus suitable for implementing the process, and the use of the apparatus according to the invention for the production of (meth)acrylic acid are characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement.Type: GrantFiled: January 14, 2002Date of Patent: September 28, 2010Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Axel Kobus, Stefan Gross, Hans-Rolf Lausch, Torsten Balduf, Roland Fornika, Guenther Bub
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Patent number: 7799946Abstract: A system and process for separating methacrolein (MA) from methacrylic acid (MAA) and acetic acid in the gas phase product from partial oxidation of isobutylene (IB) in two oxidation steps is disclosed. The process and system maximize recovery of all three components at minimum capital and energy cost, under conditions that minimize polymerization conditions and plugging by solids deposition in compressors, columns, etc.Type: GrantFiled: February 14, 2007Date of Patent: September 21, 2010Assignee: Saudi Basic Industries CorporationInventor: Frederick Merrill Galloway
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Publication number: 20100228053Abstract: Disclosed is a method for extracting methacrylic acid, in which an extraction solvent is added to a methacrylic acid aqueous solution for transferring methacrylic acid to the extraction solvent. In this method, a solvent containing t-butyl methacrylate is used as the extraction solvent.Type: ApplicationFiled: December 26, 2006Publication date: September 9, 2010Applicant: Mitsubishi Rayon Co., Ltd.Inventors: Tohru Endoh, Kazunori Matake, Shigeho Tanaka, Haruki Sato
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Patent number: 7786323Abstract: (Meth)acrolein or (meth)acrylic acid is collected by bringing a reaction gas (1) containing (meth)acrolein or (meth)acrylic acid obtained through a vapor-phase catalytic oxidation reaction into contact with an aqueous solution as a collecting solvent in a collecting tower main body (2). The reaction gas (1) is supplied to the collecting tower main body (2) from two nozzles (2c) facing each other, and is caused to collide in the collecting tower main body (2). According to the present invention, (meth)acrolein or (meth)acrylic acid can be efficiently collected from a gas containing (meth)acrolein or (meth)acrylic acid while preventing polymerization.Type: GrantFiled: May 16, 2006Date of Patent: August 31, 2010Assignee: Mitsubishi Chemical CorporationInventors: Shuhei Yada, Yasushi Ogawa, Kenji Takasaki, Yoshiro Suzuki, Kimikatsu Jinno
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Publication number: 20100204068Abstract: A method of controlling or arresting the rate of depolymerization of a polymer composition during a biocide treatment by controlling the pH of the composition, and use of such methods in oilfield applications.Type: ApplicationFiled: February 12, 2010Publication date: August 12, 2010Applicant: Rhodia OperationsInventors: Subramanian Kesavan, Gary Woodward, Adedamola Adedeji, Timothy Curtis, Francis Smith
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Patent number: 7762404Abstract: An apparatus for separating crystals from their suspension in contaminated crystal melt with purification, in which a hydraulic wash column has distributor aids in a distributor space.Type: GrantFiled: November 8, 2002Date of Patent: July 27, 2010Assignee: BASF AktiengesellschaftInventors: Joerg Heilek, Dieter Baumann, Bernd Eck, Ulrich Hammon, Klaus Joachim Mueller-Engel
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Patent number: 7732639Abstract: The invention relates to a method for preparing acrylic acid by oxidizing propylene and then acrolein, involving the recycling of gases that had not reacted by means of a partial oxidation of the propane, in parallel, at the end of the acrylic acid recovery step, then returning, to the propylene-converting reactor, a gas rich in both propane and propylene having been subjected to a second passage in the acrylic acid recovery column.Type: GrantFiled: July 9, 2007Date of Patent: June 8, 2010Assignee: Arkema FranceInventors: Jean-Luc Dubois, Stephanie Serreau, Fabienne Desdevises
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Patent number: 7732624Abstract: A process for continuously removing a target product X in the form of fine crystals from a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in an indirect heat transferer, in which the crystal suspension formed is conducted out of the heat transferer first into a mixed buffer tank and, from there, fed to an apparatus for separating the crystal suspension into crystals and liquid phase, and wherein external measures dissipade the oversaturation of the crystal suspension fed to the buffer vessel with target product X.Type: GrantFiled: September 11, 2008Date of Patent: June 8, 2010Assignee: BASF SEInventors: Joerg Heilek, Ulrich Hammon, Klaus Joachim Mueller-Engel, Volker Schliephake, Dieter Baumann
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Patent number: 7714164Abstract: In a production method in which an acrylic acid-containing solution obtained from an acrylic acid-containing gas (or an acrylic acid-containing liquid obtained simply by subjecting the acrylic acid-containing solution to a separation process of reaction by-products) is directly subjected to a crystallization process, the crystallization process can't be carried out smoothly in an unsteady state (when the concentration of water in the acrylic acid-containing solution is high). The present invention aims to provide a method for collecting the purified acrylic acid having high purity in good yield even in an unsteady state. When the acrylic acid-containing solutions 18 and 16 have a concentration of water higher than 10 mass % (unsteady state), the purified acrylic acid 20 and 22 or the acrylic acid-containing solution 23 containing 10 mass % or less of water is mixed therewith to make the concentration of water 10 mass % or less [a] [b].Type: GrantFiled: September 19, 2007Date of Patent: May 11, 2010Assignee: Nippon Shokubai Co., Ltd.Inventor: Satoshi Nakagawa
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Patent number: 7705181Abstract: A process for removing methacrylic acid from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrylic acid as a secondary component in which the removal is effected by crystallization, the acrylic acid accumulating in the crystals formed and the methacrylic acid in the remaining mother liquor.Type: GrantFiled: February 15, 2006Date of Patent: April 27, 2010Assignee: BASF AkiengesellschaftInventors: Jörg Heilek, Klaus Joachim Müller-Engel, Christoph Adami, Martin Dieterle
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Patent number: 7700804Abstract: A process for transferring heat to a liquid mixture comprising at least one (meth)acrylic monomer in an indirect heat exchanger, wherein a quaternary ammonium salt, a tertiary amine or a salt thereof with a Brønsted acid is added to the liquid mixture to reduce fouling.Type: GrantFiled: December 21, 2007Date of Patent: April 20, 2010Assignee: BASF AktiengesellschaftInventors: Gunter Lipowsky, Volker Schliephake, Steffen Rissel, Ulrich Jaeger, Frank Hoefer, Sylke Haremza, Peter Zurowski, Klaus Joachim Mueller-Engel
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Publication number: 20100022734Abstract: A process for separating acrylic acid present as a main product and glyoxal present as a by-product in a product gas mixture of a partial gas phase oxidation of a C3 precursor compound, in which a liquid phase P is obtained, which consists of acrylic acid to an extent of at least 70% of its weight and, based on the molar amount of acrylic acid present therein, comprises at least 200 molar ppm of glyoxal, in which the glyoxal is separated from the acrylic acid in the liquid phase P by crystallization.Type: ApplicationFiled: July 24, 2009Publication date: January 28, 2010Applicant: BASF SEInventors: Till Blum, Peter Zurowski, Steffen Rissel, Sylke Haremza, Thorsten Friese, Ulrich Jäger, Volker Schliephake, Klaus Joachim Müller-Engel, Ulrich Hammon, Jörg Heilek, Imke Britta Müller
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Patent number: 7632968Abstract: Disclosed is a method for producing (meth)acrylic acid comprising a process of recovering (meth)acrylic acid as aqueous (meth)acrylic acid solution from a (meth)acrylic acid-containing gas mixture produced by the catalytic gas phase oxidation of at least one reactant selected from the group consisting of propane, propylene, isobutylene and (meth)acrolein, wherein the recovering process comprises the steps of: (1) feeding the (meth)acrylic acid-containing gas mixture into a quenching tower and condensing it in the quenching tower so as to recover an aqueous (meth)acrylic acid solution from the bottom of the quenching tower, in which some of the recovered aqueous (meth)acrylic acid solution is recycled to the upper portion of the quenching tower so as to condense the (meth)acrylic acid-containing gas mixture; (2) passing the uncondensed part of the (meth)acrylic acid-containing gas mixture from the top of the quenching tower to a distillation tower; and (3) heating the bottom of the distillation tower to separaType: GrantFiled: July 28, 2005Date of Patent: December 15, 2009Assignee: LG Chem, Ltd.Inventors: Seong Pil Kang, Seok Hwan Choi, Kyoung Su Ha, Jun Seok Ko, Young Bae Kim, Boo Gon Woo, Min Jeong Park
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Publication number: 20090299095Abstract: The present invention relates to recovery of aqueous (meth)acrylic acid by condensation of a (meth)acrylic acid-containing stream to produce aqueous (meth)acylic acid having a higher concentration of (meth)acrylic acid and a lower concentration of formaldehyde, i.e., not more than 0.1 weight %, than the aqueous (meth)acrylic acid produced using hithertofore known separation methods. The (meth)acrylic acid-containing stream may be the raw product stream of catalytic oxidation at least one C2-C4 alkane or alkene.Type: ApplicationFiled: June 1, 2009Publication date: December 3, 2009Inventors: Keith F. Briegel, Michael Stanley DeCourcy, James Elder, James Jerrick Juliette, Joy Lydon Mendoza
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Patent number: 7622607Abstract: The present invention relates to a method for purifying (meth)acrylic acid obtained by catalytic or redox oxidation of a gaseous substrate constituting propane, propylene, acrolein, isobutane, isobutene, tert-butyl alcohol and/or (meth)acrolein or mixtures thereof by sending the gaseous reaction mixture to the bottom of a countercurrent absorption column (C1) which is supplied at the top with at least one type of hydrophobic heavy solvent, sending the flow (4) from the bottom of column (C1) to a separation column (C2). Column (C1) is operated at a flow rate of heavy solvent of from 3 to 5.6 times the flow rate of the (meth)acrylic acid in the gaseous reaction mixture and the rectifying column used as a separation column (C2) is operated with the feed at the top and without reflux.Type: GrantFiled: October 1, 2004Date of Patent: November 24, 2009Assignee: Arkema FranceInventors: Michel Fauconet, Denis Laurent
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Patent number: 7612231Abstract: Disclosed is a simplified method for recovering acrylic acid from a mixture containing acrylic acid, acrylic acid dimer and impurities with high boiling point, in a stable and efficient manner. The method comprises the steps of: introducing the mixture into an acrylic acid recovering device comprising an acrylic distillation unit integrated with an acrylic acid dimer pyrolysis tank; carrying out decomposition of acrylic acid dimmer under reduced pressure and recovering acrylic acid. The method optionally further comprises a step of recycling a portion of the solution obtained from the bottom of the acrylic acid recovering device to the acrylic acid recovering device.Type: GrantFiled: April 28, 2005Date of Patent: November 3, 2009Assignee: LG Chem, Ltd.Inventors: Seong Pil Kang, Seok Hwan Choi, Kyoung Su Ha, Jun Seok Ko, Boo Gon Woo, Young Bae Kim
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Publication number: 20090270652Abstract: A process for transferring heat to a liquid F comprising dissolved monomeric acrylic acid, Michael acrylic acid oligomers, and acrylic acid polymer with the aid of an indirect heat exchanger to which are supplied the liquid F with a temperature TF of ?150° C. and a fluid heat carrier W with a temperature of TW>TF, wherein the formation of gas bubbles and/or of thin layers of liquid F adjoining a gas phase is brought about in the liquid F during the flow through the heat exchanger.Type: ApplicationFiled: April 24, 2009Publication date: October 29, 2009Applicant: BASF SEInventors: Till BLUM, Peter ZUROWSKI, Steffen RISSEL, Sylke HAREMZA, Thorsten FRIESE, Ulrich JAGER, Volker SCHLIEPHAKE, Klaus Joachim MUELLER-ENGEL, Bernd RUMPF
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Patent number: 7601865Abstract: A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. A tertiary amine and CO2 are introduced to the solution to form the insoluble carbonate salt and a complex between the acid and an amine. A water immiscible solvent, such as an alcohol, is added to extract the acid/amine complex from the dilute salt solution to a reaction phase. The reaction phase is continuously dried and a product between the acid and the solvent, such as an ester, is formed.Type: GrantFiled: January 28, 2005Date of Patent: October 13, 2009Assignee: ZeaChem, Inc.Inventors: Dan W. Verser, Timothy J. Eggeman
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Patent number: 7601866Abstract: A process for removing methacrolein from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component in which the removal is effected by crystallization, the acrylic acid accumulating in the crystals formed and the methacrolein in the remaining mother liquor.Type: GrantFiled: February 22, 2006Date of Patent: October 13, 2009Assignee: BASF AktiengesellschaftInventors: Joerg Heilek, Klaus Joachim Mueller-Engel, Christoph Adami, Martin Dieterle
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Publication number: 20090253934Abstract: The process for the distillation of a gas mixture comprising (meth)acrylic acid obtained from the gas-phase oxidation of at least one (meth)acrylic acid precursors is improved through the use of coupled distillation columns. In a first column, the gaseous mixture is dehydrated while in a second column, the dehydrated gaseous mixture is distilled into product, overhead and bottoms streams.Type: ApplicationFiled: August 31, 2007Publication date: October 8, 2009Inventors: Fungau Ho, Olan S. Fruchey, Roger L. Roundy, William G. Etzkorn, Christopher T. Reeves, Mahmood Jawaid, Edmund J. Yang, Dennis W. Jewell
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Patent number: 7589236Abstract: A process for separating acrylic acid and benzoic acid present in the product gas mixture of a partial oxidation to acrylic acid, in which the acrylic acid and the benzoic acid are first converted to a liquid phase, constituents having a lower boiling point than benzoic acid and acrylic acid are removed therefrom by thermal separating processes, and the acrylic acid is removed by crystallization from the remaining liquid phase.Type: GrantFiled: October 17, 2007Date of Patent: September 15, 2009Assignee: BASF AktiengesellschaftInventors: Joerg Heilek, Klaus Joachim Mueller-Engel, Martin Dieterle, Armin Diefenbacher
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Publication number: 20090203938Abstract: The compounds of formula (I) are provided as deposition inhibitors which prevent the deposition of compounds of polymeric nature or resulting from addition reactions to (meth)acrylic double bonds during operations for the synthesis or purification or regeneration of (meth)acrylic monomers. R1 represents a C3-C30 alkyl radical, an aryl radical or an alkylaryl radical, it being possible for these radicals to be interrupted by or connected to the oxygen of the molecule via a —(OR4)o— chain where the R4 groups each independently represent an ethylene, propylene or butylene chain and o is an integer from 1 to 50; R2 represents R1, a hydrogen atom or a counterion; and R3 represents a hydrogen atom or a counterion.Type: ApplicationFiled: October 7, 2005Publication date: August 13, 2009Applicant: Arkema FranceInventors: Jean-Francois Croizy, Michel Fauconet, Jean-Michel Paul, Rene Bonnaz
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Publication number: 20090192332Abstract: Methods of preparing isoprenyl cysteine compounds by coupling a cysteine compound with an activated (i.e. halogenated) lipid are disclosed. Also disclosed, among other things, are methods of making activated (i.e. halogenated) lipids, and methods of purifying isoprenyl cysteine compounds.Type: ApplicationFiled: January 23, 2009Publication date: July 30, 2009Inventors: Keshava Rapole, Jeffry B. Stock, Michael Voronkov
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Patent number: 7566804Abstract: A process for preparing acrylic acid, in which an acrylic acid-comprising product gas mixture obtained by catalytic gas phase partial oxidation of a C3 precursor of acrylic acid is fractionally condensed in a condensation column provided with internals ascending into itself with side draw removal of crude acrylic acid and with liquid phase draw removal of acrylic acid-comprising acid water, and acrylic acid present in acid water is taken up into an extractant and then removed from the extractant and recycled into the condensation column, or taken up in aqueous metal hydroxide, or sent to further purification of the crude acrylic acid.Type: GrantFiled: January 25, 2008Date of Patent: July 28, 2009Assignee: BASF AktiengesellschaftInventors: Armin Diefenbacher, Ulrich Hammon, Volker Schliephake, Georg Sieder
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Patent number: 7560590Abstract: A process for rectificatively separating an acrylic acid-containing liquid, by withdrawing an acrylic acid-rich stream from the rectification column above the feed point and polymerization-inhibiting the upper section of the rectification column by means of diacrylic acid.Type: GrantFiled: September 14, 2004Date of Patent: July 14, 2009Assignee: BASF AktiengesellschaftInventors: Frank Hoefer, Volker Schliephake, Klaus Joachim Mueller-Engel
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Patent number: 7557246Abstract: The present invention relates to a process for production of (meth)acrylic acid, whereby first a crude (meth)acrylic acid is produced and this crude (meth)acrylic acid is then continuously purified, whereby the continuous purification of the crude (meth)acrylic acid comprises the following process steps: a) in a composition comprising (meth)acrylic acid and impurities, precipitating the impurities in crystalline form from the composition; and b) separating the crystalline impurities precipitated from the composition. The invention also relates to the (meth)acrylic acid obtainable by this process, a device for production of (meth)acrylic acid, the use of the device or of a purification device for production of (meth)acrylic acid, (meth)acrylic acid, water-absorbing polymers, the use of water-absorbing polymers as well as fibers, sheets, foams and composites.Type: GrantFiled: July 15, 2005Date of Patent: July 7, 2009Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Torsten Balduf, Jürgen Mosler, Wilfried Uhlich, Dennis Thong Yu-Chiang, Axel Kobus, Arndt Selbach, Jürgen Kohn
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Patent number: 7557245Abstract: The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of 0.55 to 90, based on the composition, to form a purified phase containing (meth)acrylic acid and at least one impurity, wherein, in the purified phase, the quantity of at least one impurity is less than 7% by weight, based on (meth)acrylic acid in the purified phase.Type: GrantFiled: March 17, 2003Date of Patent: July 7, 2009Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Torsten Balduf, Gunther Bub, Roland Fornika, Jurgen Mosler, Thomas Rathke, Axel Kobus, Dennis Thong
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Publication number: 20090149562Abstract: A process for the preparation of (meth)acrylic acid is disclosed that includes: (a) contacting a product gas containing (meth)acrylic acid obtained from a gas phase oxidation with an aqueous phase in a quenching unit to obtain an aqueous quenched phase, (b) distilling the quenched phase in a distillation unit to obtain a bottom product and a top product, and (c) crystallizing at least the bottom product in a crystallization unit to obtain pure (meth)acrylic acid. An organic separating agent can be added after the quenching unit, such as at the latest in the crystallization unit. Also disclosed are a device for the preparation of (meth)acrylic acid, a process for the preparation of a polymer from the (meth)acrylic acid, a device for the preparation of the polymer, a polymer obtainable by this process, and the use of the (meth)acrylic acid or the polymer in a chemical product, such as fibers or shaped articles.Type: ApplicationFiled: September 13, 2005Publication date: June 11, 2009Inventors: Stefan Nordhoff, Thomas Rathke, Torsten Balduf, Axel Kobus, Dennis Thong Yu-Chiang, Jorg Leistner
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Patent number: 7540884Abstract: A process for purifying removal of crystals from their suspension in mother liquor by means of a washing column having forced transport in which the process chamber is encased by a metal wall which, on its side facing away from the process chamber, is heated at least along the length of the pure melt zone.Type: GrantFiled: November 8, 2002Date of Patent: June 2, 2009Assignee: BASF AktiengesellschaftInventors: Ulrich Hammon, Dieter Baumann, Joerg Heilek, Klaus Joachim Mueller-Engel, Bernd Eck
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Patent number: 7541417Abstract: A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A, contacting the solution A with an adsorbent material selected from the group consisting of metal oxides, modified metal oxides, activated carbons, and clays, filtering the adsorbent material to form a solution B, adding an anti-solvent to the solution B to form a solution C, and distilling the solution C, wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value of 1 to 4.Type: GrantFiled: March 30, 2006Date of Patent: June 2, 2009Assignee: SABIC Innovative Plastics IP B.V.Inventors: Sunil Ashtekar, Mahesh Malusare, Gurram Kishan, Pushpa Narayanan, Ramanarayanan GV, Arun Dixit, Pradeep Nadkarni, Jan Plen Lens
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Patent number: 7538245Abstract: Process for the manufacture of an enantiopure compound comprising at least one functional group capable of reacting with an activated carboxyl group, starting from a mixture of enantiomers of the said compound, in which process: (a) a reaction medium comprising the mixture of enantiomers and a reagent based on an enantiopure amino acid, in which reagent at least one amino group of the amino acid is protected by a protective group and in which reagent at least one carboxyl group of the amino acid is activated, is subjected to conditions appropriate for bringing about the reaction of the functional group capable of reacting with the activated carboxyl group with the activated carboxyl group, so as to form a carbonyl bond; (b) the mixture of diastereomers obtained is subjected to a separation operation, so as to obtain at least one fraction composed essentially of a diastereomer, (c) at least a portion of the said fraction is subjected to a stage of cleavage of the carbonyl bond under conditions under which theType: GrantFiled: September 8, 2004Date of Patent: May 26, 2009Assignee: Solvay S.A.Inventors: Roland Callens, Georges Blondeel, Cyrille Pousset, Ronan Gire
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Patent number: 7528210Abstract: A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A; contacting the solution A with a zeolite; filtering the zeolite to form a solution B; adding an anti-solvent to the solution B to form a solution C; and distilling the solution C; wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value 1 to 4.Type: GrantFiled: March 30, 2006Date of Patent: May 5, 2009Assignee: SABIC Innovative Plastics IP B.V.Inventors: Guohua Xiu, Tong Sun, Jan Plen Lens, Sunil Ashtekar, Mahesh Malusare, Gurram Kishan, Pushpa Narayanan
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Patent number: 7520964Abstract: A process for rectificatively separating at least one (meth)acrylic monomer-containing fluid by feeding the fluid into a rectification column containing at least one sieve tray without a runoff segment, wherein an elementary cell is obtained from a number of centers of passages in a sieve tray, and the cell shifts regularly and repeatedly along its edges, the lengths of two shifting vectors being the lengths of the edges of the cell along which the shifting is effected; an arrangement of the centers is such that the positions of an ideal center and a real center are separated by ?1% of half of the sum of the lengths of the two shifting vectors; and an arrangement of the passages is such that the sum of non-overlapping surface areas of an ideal passage with a real passage and vice versa is ?1% of the surface area of the ideal passage.Type: GrantFiled: July 2, 2003Date of Patent: April 21, 2009Assignee: BASF AktiengesellschaftInventors: Ulrich Hammon, Joachim Thiel, Volker Schliephake, Juergen Schroeder
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Patent number: 7514581Abstract: The objective of the present invention is to provide methods of efficiently purifying and producing acrylic acid by removing solid acrylic acid polymers dissolving and existing in crude acrylic acid supplied to purifying process. The purifying method of the present invention comprises: filtrating the crude acrylic acid to obtain a filtrate at temperature from 15 to 70° C. and at liquid linear velocity of 5 m/s or less, wherein the crude acrylic acid contains an acrylic acid of 50% by mass or more; and purifying the acrylic acid from the filtrate. The producing method of the present invention comprises carrying out the purifying method.Type: GrantFiled: January 19, 2007Date of Patent: April 7, 2009Assignee: Nippon Shokubai Co., Ltd.Inventors: Yoshitake Ishii, Koji Ueno
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Publication number: 20090076232Abstract: A process for operating a continuous removal of a target product X in the form of fine crystals of a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in the secondary chamber of an indirect heat exchanger to which liquid phase P flows continuously with simultaneous continuous flow through the primary chamber of the indirect heat exchanger with a coolant, and continuous withdrawal of a crystal suspension S having a degree of crystallization Y from the secondary chamber in two operating states I and II, wherein the coolant temperature is lower, the mass flow of liquid phase P is greater and the molar proportion of the constituents other than the target product X in the liquid phase P in operating state II is greater than in operating state I.Type: ApplicationFiled: September 11, 2008Publication date: March 19, 2009Applicant: BASF SEInventors: Jorg HEILEK, Ulrich Hammon, Klaus Joachim Muller-Engel
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Publication number: 20090076284Abstract: A process for continuously removing a target product X in the form of fine crystals from a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in the secondary chamber, into which the liquid phase P flows continuously, of an indirect heat exchanger with simultaneous continuous flow of a coolant through the primary chamber of the indirect heat exchanger and continuous withdrawal of a crystal suspension S having a degree of crystallization Y from the secondary chamber, in which the degree of crystallization Y is adjusted on the basis of a heat balance conducted continuously with the aid of a process computer.Type: ApplicationFiled: September 12, 2008Publication date: March 19, 2009Applicant: BASF SEInventors: Joerg Heilek, Peter Schlemmer, Ulrich Hammon, Klaus Joachim Mueller-Engel
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Publication number: 20090076286Abstract: A process for continuously removing a target product X in the form of fine crystals from a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in an indirect heat transferee, in which the crystal suspension formed is conducted out of the heat transferer first into a mixed buffer tank and, from there, fed to an apparatus for separating the crystal suspension into crystals and liquid phase, and wherein external measures dissipade the oversaturation of the crystal suspension fed to the buffer vessel with target product X.Type: ApplicationFiled: September 11, 2008Publication date: March 19, 2009Applicant: BASF SEInventors: Jorg HEILEK, Ulrich Hammon, Klaus Joachim Muller-Engel, Volker Schliephake, Dieter Baumann