Purification Or Recovery Patents (Class 568/708)
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Patent number: 9079822Abstract: A process for the preparation of mononitroaromatics and dinitroaromatics, in which a hydrate melt of at least one metal nitrate M(NO3)3 is used as a nitrating medium, it being possible for M to be the metals Fe, Cr, Y, La, Ce, Al, Bi and In, and the metal nitrate having a water content of from 4 to 9 mol of water per M(NO3)3, leads to simplifications of the process and improved yields.Type: GrantFiled: February 26, 2010Date of Patent: July 14, 2015Assignee: BASF SEInventors: Wolfgang Mackenroth, Johannes Buettner, Eckhard Stroefer, Wolfgang Voigt, Frank Bok
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Patent number: 8859819Abstract: The present invention relates to a compound of the general formula (I) where: X?S, SO or SO2; and one of the radicals R1 and R2 is a hydrogen atom and the other is a radical: a C1 to C18 linear or branched alkyl, optionally substituted by one or more halogen atom(s); a C2 to C18 linear or branched alkenyl, optionally substituted by one or more halogen atom(s); an aralkyl, optionally substituted by one or more C1 to C6 alkoxy group(s); or a COR3 or CONHR3, but not simultaneously, where R3 is a radical: a C1 to C18 linear or branched alkyl, optionally substituted by one or more halogen atom(s); a C2 to C18 linear or branched alkenyl, optionally substituted by one or more halogen atom(s); an aralkyl, optionally substituted by one or more C1 to C6 alkoxy group(s); an aralkenyl, optionally substituted by one or more C1 to C6 alkoxy groups and/or one or more OH group(s); or an aryl radical, optionally substituted by one or more C1 to C6 alkoxy group(s).Type: GrantFiled: April 8, 2010Date of Patent: October 14, 2014Assignee: Pierre Fabre Dermo-CosmetiqueInventor: Stéphane Poigny
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Patent number: 8853461Abstract: A process for preparing a deperoxidation catalyst comprising chromium as the main catalytic element is described. Also described, is a process for preparing an organic solution of a chromic acid ester. The solution can be used as a catalyst in a deperoxidation of an alkyl peroxide in a process for manufacturing cyclohexanol/cyclohexanone by oxidation of cyclohexane.Type: GrantFiled: November 18, 2010Date of Patent: October 7, 2014Assignee: Rhodia OperationsInventors: Sandra Chouzier, Serge Veracini, Françoise Igersheim
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Patent number: 8637712Abstract: Precipitations of nitrohydroxyaromatic salts out of the nitrated crude products obtained in the nitration of aromatic compounds after alkaline scrubbing, for example mononitrotoluenes, are prevented by contacting the nitrated crude products with an acidic ion exchanger. The nitrated crude products are preferably selected from a feedstream to a distillation column, a bottoms circulation stream of a distillation column and a feedstream to a vaporizer.Type: GrantFiled: January 31, 2012Date of Patent: January 28, 2014Assignee: BASF SEInventors: Holger Allardt, Andreas Raichle, Reiner Reetz, Johannes Büttner, Michael Zöllinger, Stefanie Haase, Rüdiger Fritz
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Publication number: 20130315803Abstract: A liquid-liquid-liquid three-phase continuous and countercurrent extraction apparatus comprises a three-phase-mixing chamber, a three-liquid-flow settler, and a two-phase-mixing chamber; a liquid-flow control separator placed in the three-liquid-flow settler aims to flexibly regulate the directions of three liquid flows in the three-phase system by different control separator combinations to achieve either a countercurrent operation of the top-layered phase with the middle-bottom two-layered mixtures, or a countercurrent operation of the top-middle two-layered mixtures with the bottom-layered phase; and a method of using the same, relating to extraction and separation field of chemical technology.Type: ApplicationFiled: April 11, 2011Publication date: November 28, 2013Applicant: INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCESInventors: Huizhou Liu, Kun Huang, Zhentao An
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Patent number: 8519194Abstract: In a process for producing cyclohexylbenzene, benzene and hydrogen are fed to at least one reaction zone comprising a catalyst system which comprises a molecular sieve and at least one hydrogenation metal. The MCM-22 family molecular sieve having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07 and 3.42±0.07 Angstrom, and the hydrogenation metal is selected from the group consisting of palladium, ruthenium, nickel, zinc, tin, cobalt, and combinations of any two or more thereof. Hydroalkylation conditions of temperature and pressure are selected to produce a hydroalkylation conversion in a range of from about 15% to about 75% The benzene and hydrogen are then contacted in the at least one reaction zone under said selected hydroalkylation condition to produce an effluent containing cyclohexylbenzene.Type: GrantFiled: November 24, 2009Date of Patent: August 27, 2013Assignee: ExxonMobil Chemical Patents Inc.Inventors: Tan-Jen Chen, Francisco M. Benitez, John S. Buchanan, Jane C. Cheng, Jon E. Stanat
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Patent number: 7745664Abstract: A process for preparing venlafaxine in a high yield as well as processes for producing venlafaxine hydrochloride of form I having a very high polymorphic purity are described.Type: GrantFiled: December 10, 2004Date of Patent: June 29, 2010Assignee: KRKA Tovarno Zdravil, d.d. Novo MestoInventor: Silvo Zupancic
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Patent number: 6809225Abstract: A novel method is described for producing 3,3-diarylpropylamines by hyroformylation/hydrocarbonylation and then reductive amination using a transition metal catalyst.Type: GrantFiled: July 14, 2003Date of Patent: October 26, 2004Assignee: Schwarz Pharma AGInventors: Martin Donsbach, Peter Eilbracht, Christian Buss, Andreas Schmidt
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Patent number: 5998676Abstract: A process for the conversion of a picrate salt, preferably ammonium pricrate, to picric acid by acidifying the picrate salt in a two phase liquid system. One phase is an aqueous phase which contains an acid which is effective for acidifying ammonium picrate to picric acid and the other phase is an organic solvent phase in which the picric acid is soluble.Type: GrantFiled: September 9, 1998Date of Patent: December 7, 1999Assignee: Gradient TechnologyInventors: Kym B. Arcuri, Dwayne A. Goetsch
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Patent number: 5874654Abstract: Environmentally-polluting nitrocresol values are removed from admixtures of nitroaromatic compounds comprised thereof, notably the media of nitration of aromatic compounds by reacting same with aqueous HNO.sub.3 /H.sub.2 SO.sub.4, by first intimately contacting such nitroaromatic compound admixtures with an oxidizing agent comprising hydrogen peroxide, javelle water, or mixture thereof, and thereafter with a neutralizing agent; the nitroaromatic aromatic compounds thus purified are conveniently catalytically hydrogenated into aromatic amines.Type: GrantFiled: September 19, 1997Date of Patent: February 23, 1999Assignee: Rhone Poulenc ChimieInventors: Antoinette Gacon-Camoz, Pascal Metivier
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Patent number: 5019659Abstract: Disclosed is a method for selectively separating 2-nitrosophenol from an isomeric mixture containing 2-nitrosophenol and 4-nitrosophenol by contacting the mixture with an organic solvent so as to preferentially dissolve the 2-nitrosophenol from the mixture.Type: GrantFiled: August 17, 1990Date of Patent: May 28, 1991Assignee: PPG Industries, Inc.Inventors: James A. Manner, Charles H. Hoelscher
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Patent number: 4814518Abstract: The invention relates to a process for extracting nitrohydroxyaromatics from aqueous solutions. In this process, the extracting agent used is an amine salt which comprises an aliphatic amine having a total carbon number of 10 to 75 and a strong acid. The amine salt can be employed undiluted or diluted with an organic solvent.Type: GrantFiled: August 12, 1987Date of Patent: March 21, 1989Assignee: Hoechst AktiengesellschaftInventors: Helmut Gossel, Herbert Kuckertz, Siegbert Rittner, Josef Rosenfelder, Bernhard Wojtech
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Patent number: 4447654Abstract: A process is disclosed for separating nitrated phenolic compounds from other nitrated and unnitrated phenolics by treating a mixture of the phenolics with a metal halide salt. The metal halide salt preferentially forms a complex with one of the phenolics over other related phenolics in the mixture. The preferentially-formed complex of one of the phenolics may then be isolated from the mixture and the complex decomposed to provide a product substantially enriched in, or substantially entirely composed of, one phenolic. The process is particularly suitable for resolving a mixture comprising phenol or cresol from their ortho-nitrated derivatives, or a mixture of two isomeric nitrated phenols or cresols or a mixture of mono-and dinitrated phenols or cresols.Type: GrantFiled: September 30, 1982Date of Patent: May 8, 1984Assignee: Koppers Company, Inc.Inventor: Gerd Leston
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Patent number: 4421937Abstract: Mixtures of crystals and a liquid, ordinarily comprising the mother liquor of the crystals are continuously separated by feeding the mixture into a screw type press having drainage apperatures, thereby subjecting the crystals with the mother liquor entrapped therein to pressures sufficient to substantially reduce the interstitial space between crystals. Reduction of the interstitial space causes the mother liquor to be forced out of the drainage aperatures thus purifying the crystals. This achieves a more effective separation of mother liquor from the crystals than can be achieved by gravity or the use of a device such as a centrifuge and eliminates the need for a foreign solvent to wash the mother liquor from the crystals.Type: GrantFiled: January 4, 1982Date of Patent: December 20, 1983Assignee: Monsanto CompanyInventor: Dan K. Lynch
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Patent number: 4215227Abstract: A process for preparing alkali metal salts of para-nitrophenol by contacting para-chloronitrobenzene with an aqueous solution of (1) aqueous caustic and (2) recycled filtrate and washing solution from the preparation of para-nitrophenol containing 5-20% by weight of said alkali metal salts at a temperature of from 180.degree.-250.degree. C. and at autogenous pressure in 30 seconds to 10 minutes with the mole ratio of caustic to chloronitrobenzene of from 2:1-4:1, caustic concentration in the aqueous solution of from 5-20%, the amount of recycle ranging from 5-45% by weight based on the aqueous solution.Type: GrantFiled: October 27, 1978Date of Patent: July 29, 1980Assignee: E. I. Du Pont de Nemours and CompanyInventor: Richard E. Bockrath
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Patent number: 4120902Abstract: A process for the separation and purification of reaction product from the oxidation of hydrocarbyl aromatic compounds to hydrocarbyl aromatic hydroperoxides is provided comprising (1) extracting the oxidation effluent with an aqueous alcoholic base, (2) contacting the aqueous phase thus produced with a paraffin hydrocarbon solvent to remove residual unoxidized hydrocarbyl aromatic, (3) extracting the aqueous hydrocarbyl aromatic hydroperoxide phase remaining with an aromatic solvent, and (4) washing of the hydroperoxide-containing aromatic phase with water to remove base. The resulting hydroperoxide phase substantially free of unoxidized hydrocarbyl aromatic can be subjected to acid-catalyzed cleavage to produce hydroxy aromatic and carbonyl compound products without encountering the problem of azeotrope formation between unoxidized hydrocarbyl aromatic reactant with cleavage product.Type: GrantFiled: March 7, 1977Date of Patent: October 17, 1978Assignee: Phillips Petroleum CompanyInventor: Yulin Wu
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Patent number: 4096175Abstract: Covers a method of separating a nonionic surfactant from an anionic surfactant by use of methylal.Type: GrantFiled: December 1, 1976Date of Patent: June 20, 1978Assignee: Texaco Development CorporationInventors: Carter G. Naylor, Simon P. Burns