Purification Or Recovery Patents (Class 564/437)
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Patent number: 9162970Abstract: Methods and systems for purifying a crude aniline. The method can include contacting a crude aniline that can include aniline, water, and cyclohexanone with a cation exchange resin to produce a cyclohexanone-lean product that contains less cyclohexanone than the crude aniline. The cation exchange resin can be a solid, a semi-solid, or a combination thereof.Type: GrantFiled: February 26, 2015Date of Patent: October 20, 2015Assignee: KELLOGG BROWN & ROOT LLCInventors: Theodor Wilks, Eric Wing-Tak Wong, Matthew R. Ulrich
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Publication number: 20150094493Abstract: The present invention relates to a method for treating a substance mixture comprising an aromatic amine, wherein the aromatic amine is aniline or 2,4-diaminotoluene, preferably aniline. The substance mixture comprises an aromatic amine and compounds having a higher boiling point than the aromatic amine. The method for treating the substance mixture requires I) separating the first substance mixture by means of distillation in a first distillation unit (110, 1130), to at least partially remove some of the aromatic amine in the process, and to obtain a first bottom product which is removed from the first distillation unit (110, 1130). After removal from the first distillation unit (110, 1130), the bottom product is diluted with a condensed top product from a distillation unit that is different from the first distillation unit and/or with a composition that comprises methanol.Type: ApplicationFiled: April 29, 2013Publication date: April 2, 2015Inventors: Michael Merkel, Thomas Knauf, Cliff Andre Peters, Thorsten Schmidt
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Patent number: 8981156Abstract: This invention relates to methods, which provide access to [F-18]fluoropegylated (aryl/heteroaryl vinyl)-phenyl methyl amine derivatives.Type: GrantFiled: May 30, 2011Date of Patent: March 17, 2015Assignee: Piramal Imaging SAInventors: Mathias Berndt, Matthias Friebe, Christina Hultsch, Fabrice Samson, Marianne Patt, Andreas Schildan, Christoph Smuda
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Patent number: 8697913Abstract: According to the present invention, a chemical installation is provided. The chemical installation comprises A first unit for providing a first aqueous waste stream comprising nitrobenzene; At least a second unit for providing a second aqueous waste stream comprising aniline. The chemical installation comprises an aniline cleaning apparatus for removing nitrobenzene from aniline, and further comprising a stripping column for stripping aniline from an aqueous stream. The first and second aqueous waste stream are provided to the stripping column, stripping aniline and nitrobenzene from the first and the aqueous waste stream, and the stripped aniline and nitrobenzene is provided to the aniline cleaning apparatus.Type: GrantFiled: May 21, 2010Date of Patent: April 15, 2014Assignee: Huntsman International LLCInventors: Arend-Jan Zeeuw, Mark Geoffrey Bent
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Patent number: 8686188Abstract: A method for refining an organic composition containing 4-aminodiphenylamine, aniline, azobenzene, and phenazine, having the steps of feeding the organic composition to a first rectification column, producing a first effluent composition containing aniline, azobenzene, phenazine, and a small amount of 4-aminodiphenylamine at the top of the first rectification column and a second effluent composition containing crude 4-aminodiphenylamine at the bottom of the first rectification column, feeding the second effluent composition to a second rectification column, and producing a 4-aminodiphenylamine composition at the top of the second rectification column and a residual composition at the bottom of the second rectification column.Type: GrantFiled: May 10, 2011Date of Patent: April 1, 2014Assignee: Jiangsu Sinorgchem Technology Co., Ltd.Inventors: Xiaogen Feng, Nongyue Wang, Xiaohui Mao, Ruibiao Yu, Qianwen Cheng, Renping Jiao
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Patent number: 8658828Abstract: The recovery of toluene diamine from tar waste residues discharged from the synthesis process of toluene diisocyanate comprising steps of: a) grinding the tar waste residues into particles; b) dispersing the particles of tar waste residues into a phase transfer catalyst, alkali and water to obtain a slurry, said phase transfer catalyst being selected from the group consisting of higher alcohols, polyols, polyether compounds and combinations thereof having a boiling point ranging from 120 to 280° C.; c) under the protection of a protective gas, subjecting the slurry to a hydrolysis reaction at a temperature of 120-180° C. under a meter-measured pressure of 0-0.95 MPa to produce toluene diamine; and d) recovering toluene diamine from the hydrolysis reaction solution. The present invention achieves highly efficient recovery of toluene diamine (the recovery rate of TDA is up to 60%) under mild conditions such as 120-180° C. and 0-0.Type: GrantFiled: December 19, 2011Date of Patent: February 25, 2014Assignee: Cangzhou Fengyuan Environmental Protection Science and Technology Co., Ltd.Inventor: Deshui Su
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Publication number: 20130324763Abstract: A process for the synthesis of chiral propargylic alcohols.Type: ApplicationFiled: October 14, 2011Publication date: December 5, 2013Applicant: LONZA LTDInventors: Meinrad Brenner, Erick M. Carreira, Nicka Chinkov, Miriam Lorenzi, Aleksander Warm, Lothar Zimmermann
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Patent number: 8546615Abstract: The present invention relates to solid racemic dapoxetine, solid dapoxetine S(+)enantiomer, processes for their preparation and their use in the pharmaceutically active compound dapoxetine acid addition salt, and pharmaceutical compositions thereof.Type: GrantFiled: November 13, 2009Date of Patent: October 1, 2013Assignee: Symed Labs LimitedInventors: Dodda Mohan Rao, Pingili Krishnareddy, Aadepu Jithender
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Publication number: 20130172620Abstract: This invention relates to methods, which provide access to [F-18]fluoropegylated (aryl/heteroaryl vinyl)-phenyl methyl amine derivatives.Type: ApplicationFiled: May 30, 2011Publication date: July 4, 2013Applicant: PIRAMAL IMAGING SAInventors: Mathias Berndt, Matthias Friebe, Christina Hultsch, Fabrice Samson, Marianne Patt, Andreas Schildan, Christoph Smuda
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Publication number: 20120289631Abstract: Disclosed is aromatic diamine with high purity obtained by efficiently removing impurities and preventing oxidation, and a method for manufacturing the same; and aramid fiber with improved discoloration resistance realized by preventing deterioration in quality even for a long-period exposure to the external environments of sunlight, atmosphere, and moisture, and a method for manufacturing the same.Type: ApplicationFiled: December 29, 2010Publication date: November 15, 2012Inventors: Hyojin Lee, In Sik Han
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Publication number: 20120083626Abstract: The invention relates to a process for obtaining at least one aromatic amine from a liquid mixture comprising water and the at least one aromatic amine by extracting with at least one nitroaromatic in an extraction column (1) to form an essentially water-comprising raffinate stream and an extract stream comprising the at least one nitroaromatic and the aromatic amine. The extraction column (1) is divided by a dividing wall (3) into two regions (5, 7), and, in the case of an amount of liquid for separation which is less than a minimum cross sectional loading of the entire extraction column (1), the liquid mixture to be separated is fed only to one of the regions (5, 7) of the extraction column (1) divided by the dividing wall (3). The invention further relates to a process for preparing an aromatic amine and to an apparatus for separating a liquid mixture comprising water and at least one aromatic amine by extracting with at least one nitroaromatic, comprising an extraction column (1).Type: ApplicationFiled: May 6, 2010Publication date: April 5, 2012Applicant: BASF SEInventors: Tilmann Steinmetz, Michael Nilles, Lucia Koenigsmann, Andreas Heussler, Nikolaus Zafred
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Patent number: 8110073Abstract: Aromatic amines are produced by catalytic hydrogenation of aromatic nitro compounds. The reaction mixture generated by this hydrogenation is then worked up by distillation in a manner which makes it possible to substantially free the amine of water with increased energy efficiency. Water free of amine and low boilers and the low boiling materials are also obtained.Type: GrantFiled: December 13, 2007Date of Patent: February 7, 2012Assignee: Bayer MaterialScience AGInventors: Bernd Pennemann, Bill Brady, Rainer Buse
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Publication number: 20110305618Abstract: The invention pertains to a method for eluting a radionuclide-label or a radionuclide-labeled compound using a solid phase extraction resin, to a device for performing such a method, and to a computer program for controlling such a device.Type: ApplicationFiled: December 12, 2009Publication date: December 15, 2011Applicant: BAYER SCHERING PHARMA AKTIENGESELLSCHAFTInventors: Keith Graham, Axel Rother, Dominic Franck
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Patent number: 8071813Abstract: A method in one embodiment includes contacting a strongly hydrogen bonded organic material with an ionic liquid having a fluoride anion for solubilizing the strongly hydrogen bonded organic material; and maintaining the ionic liquid at a temperature of about 90° C. or less during the contacting. A method in another embodiment includes contacting a strongly hydrogen bonded organic material with an ionic liquid having an acetate or formate anion for solubilizing the strongly hydrogen bonded organic material; and maintaining the ionic liquid at a temperature of less than about 90° C. during the contacting.Type: GrantFiled: April 23, 2008Date of Patent: December 6, 2011Assignee: Lawrence Livermore National Security, LLCInventors: Philip Pagoria, Amitesh Maiti, Alexander Gash, Thomas Yong Han, Christine Orme, Laurence Fried
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Patent number: 7989662Abstract: A process for preparing 4-aminodiphenylamine having the steps of reacting nitrobenzene and aniline in the presence of a complex base catalyst, hydrogenating the reaction mixture with hydrogen, a powdery composite catalyst, and a hydrogenation solvent; separating, recovering, and reusing the complex base catalyst and the powdery composite catalyst from the reaction mixture; separating, recovering, and reusing aniline, and optionally water, from the reaction mixture; refining the reaction mixture to obtain 4-aminodiphenylamine. The complex base catalyst comprises tetraalkyl ammonium hydroxide, and tetraalkyl ammonium salt.Type: GrantFiled: August 20, 2008Date of Patent: August 2, 2011Assignee: Jiangsu Sinorgchem Technology Co., Ltd.Inventors: Xiaogen Feng, Nongyue Wang, Xiaohui Mao, Ruibiao Yu, Qianwen Cheng
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Patent number: 7928265Abstract: Method of preparation of antioxidant composition on the basis of diphenylamine by catalytic alkylation of diphenylamine by an threefold excess of diisobutylene with regard to diphenylamine in the presence of an alkylation catalyst t in an amount of 5 to 30% by weight, as referred to diphenylamine, at a temperature of 140 to 160° C. Water contained in the catalyst, is removed and subsequently diphenylamine is left to complete the reaction with diisobutylene and after the reaction is finished, the reaction mixture is separated from the catalyst, unreacted diisobutylene is removed from it and the reaction product is obtained.Type: GrantFiled: May 5, 2006Date of Patent: April 19, 2011Assignee: Duslo A.S.Inventors: Viera Andruskova, Jan Uhlar, Peter Lehocky, Jaroslav Horak
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Publication number: 20110077393Abstract: Disclosed herein are novel methods of using polymeric adsorbent resin for chemical synthesis and the purification of product therefrom. Also disclosed herein is a novel method of using silica gel for the combination of chemical reaction and chromatography into a single step. The methods disclosed herein increase the efficiency of chemical synthesis processes. Accordingly, the utility of the methods disclosed herein includes the ability to automate chemical synthesis and purification of the resulting products.Type: ApplicationFiled: August 9, 2010Publication date: March 31, 2011Applicant: UNIVERSITY OF LOUISVILLE RESEARCH FOUNDATIONInventors: Gerald B. Hammond, Bo Xu
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Patent number: 7888394Abstract: Pharmacological inhibition of fatty acid amide hydrolase (FAAH) activity leads to increased levels of fatty acid amides. The alkylcarbamic acid aryl ester of Formula (I), KDS-4103, is a FAAH inhibitor. Described herein is a process for the preparation of the compound of Formula (I), characterization of polymorphs of the FAAH inhibitor, and their uses therof.Type: GrantFiled: August 16, 2007Date of Patent: February 15, 2011Assignee: N.V. OrganonInventors: David Putman, Olivier Dasse
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Publication number: 20100324159Abstract: Embodiments of the present invention are directed to porous resins for solid phase extractions. The resins feature at least one hydrophobic component, at least one hydrophilic component and at least one ion exchange functional group. The resins exhibit superior wetting and ion exchange performance.Type: ApplicationFiled: August 12, 2010Publication date: December 23, 2010Applicant: Waters Technologies CorporationInventors: Peter Jeng Jong LEE, John E. O'Gara
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Publication number: 20100210719Abstract: Processes for preparing desvenlafaxine and stable amorphous O-desmethylvenlafaxine succinate solid dispersions with one or more pharmaceutically acceptable carriers.Type: ApplicationFiled: July 10, 2008Publication date: August 19, 2010Applicants: DR. REDDY'S LABORATORIES LTD., DR. REDDY'S LABORATORIES, INC.Inventors: Surya Narayana Devarakonda, Sesha Reddy Yarraguntla, Venu Nalivela, Ram Thaimattam, Subbareddy Peddireddy, Balaji Raghupati, Mohammed Azeezulla Baig, Srinivas Reddy Gade, Srinivas Reddy Mallepalli, Vijaywardhan Chitta, Satyanarayana Bollikonda, Saravanan Mohanarangam, Rajasekhar Kadaboina
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Patent number: 7772437Abstract: The present invention discloses novel and improved processes for preparation of sertraline hydrochloride crystalline form II. Thus, for example, sertraline free base is dissolved in isoamyl alcohol at 25-30° C., pH of the mass is adjusted to 2.0 with conc. hydrochloric acid (36%) at 25-30° C. and then stirred for 14 hours at 25-30° C. Filtered the solid and dried at 65° C. for 4 hours to give sertraline hydrochloride crystalline form II. The present invention also provides a novel process for preparation of sertraline hydrochloride crystalline form I.Type: GrantFiled: February 17, 2009Date of Patent: August 10, 2010Assignee: Hetero Drugs LimitedInventors: Bandi Parthasaradhi Reddy, Kura Rathnakar Reddy, Rapolu Raji Reddy, Dasari Muralidhara Reddy, Kesireddy Subash Chander Reddy
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Patent number: 7772438Abstract: The present invention discloses novel and improved processes for preparation of sertraline hydrochloride crystalline form II. Thus, for example, sertraline free base is dissolved in isoamyl alcohol at 25-30° C., pH of the mass is adjusted to 2.0 with conc. hydrochloric acid (36%) at 25-30° C. and then stirred for 14 hours at 25-30° C. Filtered the solid and dried at 65° C. for 4 hours to give sertraline hydrochloride crystalline form II. The present invention also provides a novel process for preparation of sertraline hydrochloride crystalline form I.Type: GrantFiled: February 17, 2009Date of Patent: August 10, 2010Assignee: Hetero Drugs LimitedInventors: Bandi Parthasaradhi Reddy, Kura Rathnakar Reddy, Rapolu Raji Reddy, Dasari Muralidhara Reddy, Kesireddy Subash Chander Reddy
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Patent number: 7692042Abstract: Crude aniline is produced by hydrogenating nitrobenzene in the presence of a catalyst. This crude aniline is then purified by means of a single-step or multi-step distillation process in which aqueous alkali metal hydroxide solution is added to the crude aniline prior to distillation and/or during distillation of the crude aniline.Type: GrantFiled: February 15, 2007Date of Patent: April 6, 2010Assignee: Bayer MaterialScience AGInventors: Markus Dugal, Franz-Ulrich Von Gehlen, Stefan Wershofen, Andre Lago, Peter Lehner, Benie Marotz
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Publication number: 20090306431Abstract: An object of the present invention is to provide processes for producing an antiaging agent, a vulcanization accelerator and a modified natural rubber, which are environmentally friendly and capable of making provision against a decrease of petroleum resources in the future. An antiaging agent, a vulcanization accelerator or a modified natural rubber is produced by a method comprising: converting glucose into benzoic acid or a benzoic acid derivative by a microorganism or extracting benzoic acid or a benzoic acid derivative from a plant; and converting the obtained benzoic acid or benzoic acid derivative into aniline or an aniline derivative.Type: ApplicationFiled: May 21, 2009Publication date: December 10, 2009Inventor: Keitaro FUJIKURA
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Patent number: 7598420Abstract: The subject invention provides a pharmaceutical composition comprising N-propargyl-1(R)-aminoindan mesylate; a pharmaceutically acceptable carrier; and greater than 0.7 ppm but less than 30 ppm in total of a compound having the structure: and any salts of the compound.Type: GrantFiled: September 8, 2008Date of Patent: October 6, 2009Assignee: Teva Pharmaceutical Industries, Ltd.Inventors: Jeffrey Sterling, David Lerner, Harel Rosen, Leonid Bronov, Dalia Medini-Green, Berta Iosefzon, Tirtsah Berger-Peskin, Ramy Lidor-Hadas, Eliezer Bahar
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Publication number: 20090247643Abstract: Herbal compositions derived from Kenyan plants are provided for the treatment of HIV and other infectious diseases. The herbal compositions can include the extracts of up to 14 plants, including the root of Dovyalis abyssinica and Clutia robusta. Also provided are methods for extracting alkaloids and other compounds from the plants. Also provided are methods of treating a subject having an infectious disease, particularly HIV.Type: ApplicationFiled: May 8, 2009Publication date: October 1, 2009Inventors: Paul Kiprono Chepkwony, Maria Medina, Mitchell Medina
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Patent number: 7592488Abstract: The present invention relates to a method of preparing optically active amines and chiral amines prepared thereby. The method includes reacting an amine compound, a metal catalyst, a biocatalyst including a lipase, and an acyl donor compound in an organic solvent to obtain a chiral amide compound, and then hydrolyzing the chiral amide compound to obtain a chiral amine.Type: GrantFiled: August 18, 2007Date of Patent: September 22, 2009Assignee: Postech Academy-Industry FoundationInventors: Mahn-Joo Kim, Jaiwook Park, Won-Hee Kim, Kiwon Han, Yoon Kyung Choi
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Patent number: 7575660Abstract: The invention relates to an energy efficient process for the distillative working-up of aqueous amine solutions that occur in the catalytic hydrogenation of nitroaromatic compounds. In this process, the amine is freed from water and also the water is obtained free from amine and low-boiling compounds and the concentrated low-boiling compounds are obtained.Type: GrantFiled: May 26, 2005Date of Patent: August 18, 2009Assignee: Bayer MaterialScience AGInventors: Friedhelm Steffens, Rainer Buse, Bill Brady
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Patent number: 7518019Abstract: The present invention discloses novel and improved processes for preparation of sertraline hydrochloride crystalline form II. Thus, for example, sertraline free base is dissolved in isoamyl alcohol at 25-30° C., pH of the mass is adjusted to 2.0 with conc. hydrochloric acid (36%) at 25-30° C. and then stirred for 14 hours at 25-30° C. Filtered the solid and dried at 65° C. for 4 hours to give sertraline hydrochloride crystalline form II. The present invention also provides a novel process for preparation of sertraline hydrochloride crystalline form I.Type: GrantFiled: June 1, 2006Date of Patent: April 14, 2009Assignee: Hetero Drugs LimitedInventors: Bandi Parthasaradhi Reddy, Kura Rathnakar Reddy, Rapolu Raju Reddy, Dasari Muralidhara Reddy, Kesireddy Subash Chander Reddy
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Patent number: 7507351Abstract: Objects of the present invention are to provide a purification process that enables Pd to be removed effectively, and to provide an electroluminescent material and an electroluminescent device obtained by employing the process. The present invention relates to a process for purifying an electroluminescent material, the process involving treating, with a phosphorus-containing material, an electroluminescent material that contains Pd as an impurity so as to remove the Pd.Type: GrantFiled: June 4, 2004Date of Patent: March 24, 2009Assignees: Hitachi Chemical Co., Ltd., Maxdem IncorporatedInventors: Yoshihiro Tsuda, Yoshii Morishita, Satoyuki Nomura, Seiji Tai, Yousuke Hoshi, Shigeaki Funyuu, Farshad J. Motamedi, Li-Sheng Wang
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Patent number: 7488850Abstract: Compounds containing phenolic hydroxy groups are removed from a gas stream which contains at least one aromatic amine generated during the gas-phase hydrogenation reaction of the corresponding nitroaromatic compounds with hydrogen, by adsorption on a basic solid.Type: GrantFiled: November 6, 2007Date of Patent: February 10, 2009Assignee: Bayer MaterialScience LLCInventors: Knut Sommer, Markus Dugal, Ido Schwarz, Stefan Wershofen, Peter Lehner, Stephan Schubert, Alexandra Groβe Böwing
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Publication number: 20090012297Abstract: A method in one embodiment includes contacting a strongly hydrogen bonded organic material with an ionic liquid having a fluoride anion for solubilizing the strongly hydrogen bonded organic material; and maintaining the ionic liquid at a temperature of about 90° C. or less during the contacting. A method in another embodiment includes contacting a strongly hydrogen bonded organic material with an ionic liquid having an acetate or formate anion for solubilizing the strongly hydrogen bonded organic material; and maintaining the ionic liquid at a temperature of less than about 90° C. during the contacting.Type: ApplicationFiled: April 23, 2008Publication date: January 8, 2009Inventors: Philip F. Pagoria, Amitesh Maiti, Alexander Gash, Thomas Yong Han, Christine Orme, Laurence Fried
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Patent number: 7390927Abstract: A process for preparing a 3-aminophenylacetylene compound of formula (5), including: a) reacting a 3-haloaniline compound of formula (1) with an acetylene compound of formula (2) in the presence of a palladium compound, a copper compound, and an amine compound of formula (3) to form an aniline compound of formula (4); b) precipitating the aniline compound of formula (4) in the form of a crystal, and isolating it by solid/liquid separation; and c) reacting the aniline compound of formula (4) with a base to obtain 3-aminophenylacetylene.Type: GrantFiled: March 30, 2006Date of Patent: June 24, 2008Assignee: FUJILFILM CorporationInventors: Daisuke Urazoe, Hideto Mori
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Patent number: 7173153Abstract: This invention relates to a method for the preparation of sertraline hydrochloride, (1S-cis)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-1-naphtalenamine hydrochloride, in its crystalline form II.Type: GrantFiled: July 14, 2004Date of Patent: February 6, 2007Assignee: Recordati Industria Chimica E. Farmaceutica S.p.A.Inventors: Fausto Bonifacio, Cristina Crescenzi, Maria Donnarumma, Dimitri Ippoliti
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Patent number: 7147757Abstract: The invention relates to a method for separating by distillation a portion or the entirety of an azeptine derivative (III), which is selected from the group consisting of aminohexylidene imine, tetrahydroazepine, hexylhexahydroazepine and of aminohexylhexahydroazepine, out of a mixture (II) containing an azepine derivative (III) and an amine (I). The inventive method is characterized in that the distillation is carried out with a maximum bottom temperature of 150° C.Type: GrantFiled: March 6, 2001Date of Patent: December 12, 2006Assignee: Basf AktiengesellschaftInventors: Hermann Luyken, Frank Ohlbach
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Patent number: 7122700Abstract: A method for bisformylation an arylamine compound by reacting an arylamine compound with an alkyleneamine in a reaction mixture while refluxing an acid in the reaction mixture.Type: GrantFiled: July 30, 2004Date of Patent: October 17, 2006Assignee: Xerox CorporationInventors: Timothy P. Bender, Nan-Xing Hu, H. Bruce Goodbrand
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Patent number: 7067700Abstract: Sertraline hydrochloride, (1Scis)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-1-naphtalenaminehydrochloride, polymorph II is prepared by extracting or dissolving the sertraline base into ethyl acetate, adding isopropanol as a solvent, adding hydrogen chloride dissolved in ethyl acetate or in gaseous form, and finally isolating and drying sertraline hydrochloride polymorphic form II.Type: GrantFiled: May 30, 2002Date of Patent: June 27, 2006Assignee: Fermion OyInventor: Ilpo Laitinen
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Patent number: 7057072Abstract: A method to convert surplus nitroarene explosives (picric acid, ammonium picrate,) into TATB is described. The process comprises three major steps: conversion of picric acid/ammonium picrate into picramide; conversion of picramide to TATB through vicarious nucleophilic substitution (VNS) of hydrogen chemistry; and purification of TATB.Type: GrantFiled: August 2, 2004Date of Patent: June 6, 2006Assignee: The Regents of the University of CaliforniaInventors: Alexander R. Mitchell, Michael D. Coburn, Gregory S. Lee, Robert D. Schmidt, Philip F. Pagoria, Peter C. Hsu
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Patent number: 7049471Abstract: A process comprises contacting a product mixture with a base, optionally in the presence of a polyhydric alcohol, to produce a base-treated mixture and distilling the base-treated mixture in which the product mixture comprises an aromatic amine and a phenolic compound.Type: GrantFiled: March 11, 2004Date of Patent: May 23, 2006Assignee: E. I. du Pont de Nemours and CompanyInventors: Carl Andrew Renner, Richard Frank Dubnansky, Freddison A. Parsons, Richard T. Stimek, Zhihong Wu
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Patent number: 7030276Abstract: A process for preparing 2-[(dimethylamino)methyl]-1-(3-methoxyphenyl)cyclohexanol with high stereoselectivity and high yield by reacting 2-[(dimethylamino)methyl]-cyclohexanone in a Grignard reaction with a Grignard compound of 3-bromoanisole in a suitable solvent and in the presence of an inorganic lithium salt and an ?,?-dialkoxyalkane.Type: GrantFiled: February 9, 2005Date of Patent: April 18, 2006Assignee: Gruenenthal GmbHInventors: Michael Finkam, Bernhard Akteries
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Patent number: 7019174Abstract: The invention relates to a process for preparing colourless dibenzylamine by adding ammonium chlorides or amines to the industrially obtained dibenzylamine and subsequent distillation.Type: GrantFiled: June 24, 2003Date of Patent: March 28, 2006Assignee: Bayer AktiengesellschaftInventor: Lutz Heuer
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Patent number: 6869543Abstract: Clear, amine-initiated polyether polyols are made by epoxidizing an amine in the presence of an alkali metal hydroxide catalyst. By reducing the amount of catalyst used during the polyol synthesis and by adding the catalyst after between 5 and 30% of the total amount of at least one alkylene oxide has been added, after lactic acid neutralization, gives a short chain polyol that has foam processing characteristics similar to the conventional sulfuric acid neutralized polyol. The polyols produced in this manner are particularly useful for the production of polyurethane and polyisocyanurate foams.Type: GrantFiled: February 21, 2003Date of Patent: March 22, 2005Assignee: Bayer Polymers LLCInventors: Nathan L. Anderson, Karl W. Haider, Keith J. Headley, Kerry A. Ingold, Herman P. Doerge
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Patent number: 6784320Abstract: In a decarbonation process for removing carbon dioxide from a carbon dioxide-containing gas with the use of an amine compound-containing absorbing solution, an amine compound accompanying a decarbonated exhaust gas is efficiently recovered in the following manner: A water washing section is constituted in two stages, a first-stage water washing section 64 and a second-stage water washing section 65. In these water washing sections, recovery of the amine compound accompanying the decarbonated exhaust gas is performed sequentially. Regeneration tower refluxed water is supplied as washing water to the second-stage water washing section 65. Washing water is withdrawn from the second-stage water washing section 65 and supplied to the first-stage water washing section 64. Demisters 83, 84 and 85 are provided at outlets of a carbon dioxide absorption section 73, the first-stage water washing section 64 and the second-stage water washing section 65.Type: GrantFiled: August 13, 2002Date of Patent: August 31, 2004Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Heavy Industries, Ltd.Inventors: Tomio Mimura, Takashi Nojo, Kazuo Ishida, Hiroshi Nakashoji, Hiroshi Tanaka, Takuya Hirata
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Patent number: 6639102Abstract: Polyisocyanates of the diphenyl methane series having reduced color values are obtained by a) reacting aniline and formaldehyde in the presence of an acid catalyst to form a polyamine, b) neutralizing the reaction mixture containing polyamine with a base, c) separating the neutralized mixture into the aqueous and the organic phases, d) adding a base to the organic phase and then e) phosgenating the resulting polyamine to produce the corresponding polyisocyanate.Type: GrantFiled: March 10, 2003Date of Patent: October 28, 2003Assignee: Bayer AktiengesellschaftInventors: Torsten Hagen, Friedhelm Kämper, Daniel Koch, Rudolf Uchdorf, Stefan Wershofen
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Patent number: 6547933Abstract: A process for the purification of a mixture of aromatic polyamines obtained by hydrogenation of the corresponding aromatic polynitro compounds, said mixture including the various isomers of the said amines as well as reaction by-products, including the steps of carrying out a distillation of the mixture in a distillation column, wherein a first stream, corresponding to a fraction or to all of the stream recovered at the bottom of the distillation column, is separated and is used in a chemical reaction and a second stream is separated corresponding (i) to a stream drawn off from the side in the gas phase, in the lower third of the said column, this stream representing at most 20% or more than 80% of the total volume (first and second stream); or (ii) to a fraction of the first stream, this fraction representing 2 to 50% of the volume of the first stream; in order to treat it subsequently.Type: GrantFiled: April 4, 2002Date of Patent: April 15, 2003Inventors: Philippe Marion, Stephane Montarsolo
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Patent number: 6515036Abstract: A method of recovering a decomposition product from a polyurethane, the method comprising the steps of thermally decomposing a polyurethane into a liquid containing a polyol and a urea compound which is soluble in the polyol, and solids containing a urea compound which is insoluble in the liquid in the presence of a polyamine compound at a temperature of 120 to 250° C.; removing the solids; hydrolyzing the residue with water retained at a high temperature of 200 to 320° C. and a high pressure; and recovering the resulting polyamine and/or polyol.Type: GrantFiled: April 2, 2001Date of Patent: February 4, 2003Assignee: Mitsui Takeda Chemicals Inc.Inventors: Koichi Murayama, Katsuhisa Kodama, Takashi Kumaki
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Patent number: 6469212Abstract: A mixture comprised of about 60-85% of 2,4-toluenediamine (2,4-TDA) and about 15-40% of 2,6-toluenediamine (2,6-TDA) is melted, the temperature of the mixture is lowered to a 2,4-TDA nucleation temperature, and the temperature of the mixture is gradually reduced from the nucleation temperature to about 65 to about 70° C. The resultant mixture is in the form of a solids phase enriched in 2,4-TDA, and a novel and useful liquid phase enriched in 2,6-TDA. These phases are separated. Preferably the solids are further purified by “sweating” them and removing the sweated liquid impurities. The sweated liquid can be recycled together with another charge of a mixture comprised of 2,4-TDA and 2,6-TDA. 2,4-TDA can be produced with a purity of 96-99%.Type: GrantFiled: March 20, 2000Date of Patent: October 22, 2002Assignee: Albemarle CorporationInventors: John C. Prindle, Jr., Michael W. Easson, James Dee Palmer, Jason G. Jones, Max K. Mortensen, James E. Boone
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Publication number: 20020146590Abstract: This invention relates to organic electroluminescent elemental devices (organic EL devices) of excellent durability and to organic EL materials useful for such organic EL devices. The organic EL material of this invention comprises a tertiary aryl amine containing 2-4 nitrogen atoms forming triarylamines and, as impurity, compound (A) containing one less nitrogen atoms forming triarylamines than said tertiary aryl amine or compound (B) containing one more nitrogen atoms forming diarylamino groups than said tertiary aryl amine with the content of compound (A) controlled at 1 wt % or less and that of compound (B) at 2 wt % or less.Type: ApplicationFiled: February 1, 2002Publication date: October 10, 2002Inventors: Shinji Matsuo, Kazuo Ishii, Hiroshi Miyazaki, Toshinao Yuki, Hitoshi Nakada, Ryuji Murayama, Yasuhiko Sawada, Tsuyoshi Naijo, Yoshinori Fukuda
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Patent number: 6448446Abstract: An improved synthesis of N,N,-disubstituted-p-phenylene-diamine (DSPDA) preferably di-n-butyl-p-phenylenediamine is disclosed. The improvement rests on the discovery that DSPDA and its salts are extremely sensitive to oxygen so that once the product DSPDA or its salt is formed, oxygen must be excluded from all manipulations.Type: GrantFiled: January 12, 2001Date of Patent: September 10, 2002Assignee: AntiCancer, Inc.Inventors: Li Tang, Yuying Tan
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Patent number: 6429336Abstract: Residues from the distillation of a toluene diamine phosgenation mixture are hydrolyzed by mixing them with water and subjecting the mixture to a temperature of 200-350 ° C. The hydrolysis is performed in the presence of a sufficient amount of a base to maintain the pressure in the reactor to no more than a predetermined operating level. The product mixture is then extracted to recover TDA, which can be recycled. This provides an efficient process whereby nearly quantitative conversion of the residues to TDA can be achieved.Type: GrantFiled: May 5, 2000Date of Patent: August 6, 2002Assignee: The Dow Chemical CompanyInventors: Shenghong A. Dai, Duane S. Treybig, Kathryn Hock, Van A. Kent