Dehalogenation Or Dehydrohalogenation Patents (Class 570/204)
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Patent number: 11279888Abstract: Processes and systems are disclosed for improving the yield from reforming processes. Aromatic complex bottoms, or a heavy fraction thereof, are subjected hydrogenation to produce additional gasoline and higher-quality aromatic compounds.Type: GrantFiled: February 13, 2020Date of Patent: March 22, 2022Assignee: SAUDI ARABIAN OIL COMPANYInventors: Robert Peter Hodgkins, Omer Refa Koseoglu, Frederick Marie Adam
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Patent number: 8841493Abstract: The subject matter of the invention is a process for preparing fluoroolefin compounds. The invention relates more particularly to a process for producing a (hydro)fluoroolefin compound, which comprises (i) bringing at least one compound comprising from three to six carbon atoms, at least two fluorine atoms and at least one hydrogen atom, on the condition that at least one hydrogen atom and one fluorine atom are located on adjacent carbon atoms, into contact with a solid reactant comprising calcium hydroxide.Type: GrantFiled: May 4, 2010Date of Patent: September 23, 2014Assignee: Arkema FranceInventors: Dominique Guillet, Michel Devic
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Publication number: 20130116484Abstract: The present invention relates to a cation-exchanged zeolite catalyst for an transiodination and a process for producing mono-iodo benzene by using it. Particularly, the cation-exchanged zeolite catalyst has a molar ratio of Si/Al from 5 to 100 and is ion-exchanged with an alkali metal or an alkaline earth metal in range of 2% to 50% of ion exchange capacity. Further, the process for producing mono-iodo benzene of the present invention comprises the step of performing a transiodination by using the cation-exchanged zeolite catalyst to produce mono-iodo benzene from reactants including benzene and one or more multi-iodo benzenes selected from the group consisting of di-iodo benzene and tri-iodo benzene.Type: ApplicationFiled: December 7, 2012Publication date: May 9, 2013Applicant: SK Chemicals Co., Ltd.Inventor: SK Chemicals Co., Ltd.
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Publication number: 20110105539Abstract: A process for obtaining 2?-halo-4-methylbiphenyls is described, which comprises reacting 4 halotoluene with a 1,2-dihalobenzene in the presence of elemental metal such as magnesium, lithium or zinc, wherein 0 to 0.9 molar, particularly 0 to 0.2 molar excess of 4-halotoluene in regard to 1,2-dihalobenzene is used, and arised organometal intermediates are quenched by elemental mental halogen. In addition, the coupling of arised 2?-halo-4-methylbiphenyls with 2-(1-propyl)-4-methyl-6-(1?-methylbenzimidazole-2-il)benzimidazole to afford 3?-(2?-halo-biphenyl-4-ylmethyl)-1,7?-dimethyl-2?-propyl-1H,3?H-[2,5?]bibenzoimidazolyl, which can be further converted to organometallic compound and said organometallic compound is further reacted with formic acid derivative, such as N,N-dimethylformamide, alkylformiate or carbon dioxide to obtain telmisartan, is also described.Type: ApplicationFiled: March 19, 2009Publication date: May 5, 2011Applicant: LEK Pharmaceuticals D.D.Inventors: Anton Copar, Zdenko Casar, Andrej Premrl
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Patent number: 7781615Abstract: The present invention relates to a novel a process for the preparation of the compound of the general formula (I), wherein R1 and R2 are independently H or C1-6 alkyl, which comprises treating with a reducing agent either a compound of the general formula (II), wherein R1 and R2 have the meanings given for the compound of the formula (I), R3 is H or C1-4alkyl and Ph is phenyl, or a compound of the general formula (III), wherein R1, R2, R3 and Ph have the meanings given for the compound of the formula (II), the reducing agent being effective to cleave the benzyl moiety Ph-CH(R3)— from the benzylamino moiety PhCH(R3)NH— in the compound of the formula (II) or in the compound of the formula (III) to leave an amino group and, in addition, in the case of the compound of the formula (III), to reduce both the 2,3-double bond and the double bond joining the R1R2C— moiety to the 9-position of the benzonorbornene ring to single bonds.Type: GrantFiled: December 11, 2006Date of Patent: August 24, 2010Assignee: Syngenta Crop Protection, Inc.Inventors: Hans Tobler, Harald Walter, Camilla Corsi, Josef Ehrenfreund, Fanny Giordano, Martin Zeller
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Publication number: 20100137659Abstract: A process for the synthesis of 2,2?,6-tribromobiphenyl.Type: ApplicationFiled: September 26, 2007Publication date: June 3, 2010Inventors: Frédéric Leroux, Laurence Bonnafoux, Francoise Colobert
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Publication number: 20100094067Abstract: The present invention relates to a method of preparing mono-iodo benzene with a transiodination reaction, and more preferably a method of preparing mono-iodo benzene including a step of performing transiodination of a reactant including benzene and at least a multi-iodo benzene selected from the group consisting of di-iodo benzene and tri-iodo benzene with an HY or HBeta type of zeolite having a Si/Al molar ratio of 10 to 100 as a catalyst. The method of the present invention has an advantage that iodine is recovered from by-products including m-di-iodo benzene, o-di-iodo benzene, and tri-iodo benzene obtained in the process of preparing p-di-iodo benzene, thereby resulting in minimizing the loss of iodine.Type: ApplicationFiled: November 23, 2007Publication date: April 15, 2010Applicant: SK CHEMICALS CO., LTDInventors: Han-Seok Kim, Jong-In Lee, Il-Hoon Cha, Yong-Ki Park, Won-Choon Choi, Bu-Sub Song
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Patent number: 7547809Abstract: A process for producing an aromatic compound which can effectively decrease the contents of halogen elements in the aromatic compound and an aromatic compound which is produced in accordance with the process and useful as the material for obtaining an organic electroluminescence device having a long life are provided. The process for producing an aromatic compound comprises bringing an aromatic compound which is produced via an intermediate compound having halogen elements and has contents of halogen elements of 10 to 1,000 ppm by mass into reaction with a dehalogenating agent to decrease the contents of halogen elements to 10 ppm by mass or smaller, and an aromatic compound which is produced in accordance with the process.Type: GrantFiled: June 23, 2006Date of Patent: June 16, 2009Assignee: Idemitsu Kosan Co., Ltd.Inventors: Fumio Moriwaki, Hidehiro Matsunami, Tetsuya Inoue
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Publication number: 20080114195Abstract: Solid-state highly brominated compounds such as solid brominated flame retardants with bromine contents of at least about 60 wt % often contain occluded bromine. Because of their high bromine contents, such compounds have relatively low solubility in common organic solvents. Despite this low solubility, the content of occluded bromine in such solid brominated compounds is effectively reduced by agitating a concentrated agitated slurry of the compound in an inert solvent at a suitable temperature for at least about 1 hour. Thereafter, solids with reduced content of occluded bromine are isolated or recovered from the slurry. Novel products having substantially reduced or eliminated occluded bromine contents and other very desirable characteristics are also provided.Type: ApplicationFiled: August 17, 2007Publication date: May 15, 2008Applicant: ALBEMARLE CORPORATIONInventors: Saadat Hussain, Arthur G. Mack
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Patent number: 6495728Abstract: A two-step process for the preparation of fluoroolefin compounds of formula I wherein R is hydrogen or alkyl, and R1 is alkyl or cyclopropyl, or R and R1 are taken together with the carbon atom to which they are attached to form a cyclopropyl group; Ar is phenyl or naphthyl both of which are optionally substituted; Ar1 is phenoxyphenyl, biphenyl, phenyl, benzylphenyl, or benzoylphenyl, all of which may be optionally substituted, comprising reacting fluorobromoolefin compounds of formula II with organozinc compounds of formula III or IV in the presence of a palladium catalyst and a solvent, which compounds of formula II are obtained by reacting aldehyde compounds of formula V with (a) fluorotribromomethane, (b) a tri(substituted)phosphine or a hexaalkylphosphoramide or a mixture thereof, and (c) zinc, in the presence of a solvent, compounds of formula II.Type: GrantFiled: September 12, 2001Date of Patent: December 17, 2002Assignee: BASF AktiengesellschaftInventor: William Wakefield Wood
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Patent number: 6482996Abstract: Disclosed is a method for the production or preparation of 2,6-dichlorotoluol by the catalytic hydrodechlorination of polychlorotoluol-containing mixtures in the presence of hydrogen, whereby the reaction is performed in the presence of an aluminium silicate-supported Pd-containing catalyst.Type: GrantFiled: April 12, 2002Date of Patent: November 19, 2002Assignee: Bayer AktiengesellschaftInventors: Wolfram Eichinger, Andreas Schulze-Tilling, Kai Röhlk
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Publication number: 20020035300Abstract: A process is disclosed for producing the pentafluoropropenes of the formula CF 3 CX═CF 2 , where X is H or Cl. The process involves hydrodehalogenating CF 3 CCl 2 CF 3 with hydrogen at an elevated temperature in the vapor phase over a catalyst comprising an elemental metal, metal oxide, metal halide and/or metal oxyhalide (the metal being copper, nickel, chromium and the halogen of said halides and said oxyhalides being fluorine and/or chlorine).Type: ApplicationFiled: August 19, 1999Publication date: March 21, 2002Inventors: V.N. MALLIKARJUNA RAO, ALLEN CAPRON SIEVERT
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Patent number: 6018051Abstract: In order to subject a cellulosic material such as insulating paper onto and into which transformer high-voltage insulating oil containing PCB has adhered and permeated to washing that removes the PCB etc. to an undetectable value, the cellulosic material to which PCB etc. has adhered is placed in DMI, sulfolane or other aprotic solvent containing an alkali such as caustic soda and stirred.Type: GrantFiled: September 8, 1998Date of Patent: January 25, 2000Assignees: Research Institute for Production Development, Mitsui & Co., Ltd., NEOS Co., Ltd.Inventors: Fumio Tanimoto, Tsuneo Yano
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Patent number: 5663413Abstract: The invention relates to novel contrast media particularly useful for X-ray diagnostic investigations of human and animal body.Type: GrantFiled: May 24, 1995Date of Patent: September 2, 1997Assignee: Dibra S.p.A.Inventors: Fulvio Uggeri, Pier Lucio Anelli, Marino Brocchetta, Massimo Visigalli
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Patent number: 5648499Abstract: A safe and reliable method of decomposing halogenated aromatic compounds, wherein a heat-resistant alkaline polar solvent containing halogenated aromatic compounds is contacted with a alkali at a temperature ranging from about 100.degree. C. to 300.degree. C. in order to decompose the halogenated aromatic compounds. The used solvent is removed of solid contents of salts, alkalis and the like, whereby it can be recycled.Type: GrantFiled: March 23, 1995Date of Patent: July 15, 1997Assignees: Mitsui & Co., Ltd., Neos Co., Ltd, Research Institute for Production DevelopmentInventors: Fumio Tanimoto, Tsuneo Yano
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Patent number: 5552549Abstract: Chlorinated aromatic compounds are dechlorinated in a simple and inexpensive manner by heating them to 300.degree. to 450.degree. C. in a salt melt in the presence of water and/or water vapor and carbon.Type: GrantFiled: September 29, 1994Date of Patent: September 3, 1996Assignee: Bayer AktiengesellschaftInventors: Christian Rasp, Helmut Waldmann, Hans-Joachim Traenckner
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Patent number: 5545779Abstract: Halogenated benzenes are hydrodehalogenated in a particularly advantageous manner and at low temperatures by contacting them at temperatures of between 100.degree. and 250.degree. C. together with hydrogen with a catalyst prepared by application of one or more salts of palladium and/or platinum and, if desired, of copper to an alumina or titanium dioxide support.Type: GrantFiled: October 6, 1994Date of Patent: August 13, 1996Assignee: Bayer AktiengesellschaftInventors: Michael Pies, Josef Kasbauer, Helmut Fiege
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Patent number: 5369214Abstract: A method for dehalogenating halogenated polyaromatic compounds is provided wherein the polyaromatic compounds are mixed with a hydrogen donor solvent and a carbon catalyst in predetermined proportions, the mixture is maintained at a predetermined pressure, and the mixture is heated to a predetermined temperature and for a predetermined time.Type: GrantFiled: January 7, 1994Date of Patent: November 29, 1994Assignee: The United States of America as represented by the United States Department of EnergyInventors: Malvina Farcasiu, Steven C. Petrosius
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Patent number: 5304702Abstract: Polyhalogenated organic compounds, such as polychlorinated dibenzodioxines, dibenzofurans, biphenyls, biphenyl ethers, phenols, benzenes and cyclohexanes as well as chlorofluorohydrocarbons are destroyed by reaction with a surplus of strongly basic hydrocarbon-soluble, strongly basic lithium compounds in an inert solvent at reaction temperatures from 0.degree. to 200.degree. C.Type: GrantFiled: March 13, 1992Date of Patent: April 19, 1994Assignee: Metallgesellschaft AGInventors: Wilfried Weiss, Klaus Kobele
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Patent number: 5292975Abstract: When the halogen content of polyhalogenated aromatics is decreased by reaction with monohalogenated and/or non-halogenated aromatics in the gas phase, good yields and significantly improved catalyst service lives are achieved if the reaction is carried out in the presence of a catalyst and in the presence of a hydrogen halide.Type: GrantFiled: February 23, 1993Date of Patent: March 8, 1994Assignee: Bayer AktiengesellschaftInventors: Heinrich Schrage, Helmut Fiege
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Patent number: 5243110Abstract: 1,1-Bis(R-phenyl)-2,2,2-trichloroethanes are dehydrochlorinated in high yields, e.g., into 1,1-bis(chlorophenyl)-2,2-dichloroethylenes, by reacting same with an aqueous solution of an alkali metal hydroxide, in liquid state in the presence of a phase transfer agent, e.g., a quaternary ammonium compound, but in the absence of any reaction solvent.Type: GrantFiled: June 19, 1992Date of Patent: September 7, 1993Assignee: Elf Atochem S.A.Inventors: Jaume Castella Sola, Jaime Palencia Adrubau
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Patent number: 5243088Abstract: Dibromonaphthalene compounds having the formula (1): ##STR1## are 1-monodebrominated by reacting same, neat or in an acid organic solvent, with molecular hydrogen or a compound that generates nascent hydrogen, in situ, in the medium of reaction, in the presence of a catalytically effective amount of a hydrodebromination catalyst.Type: GrantFiled: October 31, 1991Date of Patent: September 7, 1993Assignee: Potasse et Produits ChimiquesInventors: Roland Jacquot, Francoise Truchet
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Patent number: 5196617Abstract: A process for hydrodehalogenating halogenated organic compounds present in a contaminated aqueous environmental source in which the halogenated organic compounds are reacted with hydrogen gas or a source of hydrogen gas in the presence of a catalyst of palladium on carbon.Type: GrantFiled: January 14, 1992Date of Patent: March 23, 1993Assignee: Engelhard CorporationInventors: Suphan Kovenklioglu, Edward N. Balko, Jeffrey B. Hoke, Robert J. Farrauto, Gary A. Gramiccioni
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Patent number: 5177272Abstract: The invention relates to a process for preparing perhalogenated olefins which comprises reacting a perhalogenated alkane, having at least one atom of a halogen different from fluorine, with a tris-dialkylamino phosphine at temperature not higher than 60.degree. C.Type: GrantFiled: January 23, 1992Date of Patent: January 5, 1993Assignee: Ausimont S.p.A.Inventors: Vittorio Montanari, Darryl D. Desmarteau, Walter Navarrini
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Patent number: 5157170Abstract: The halogen of a polyhalogenated aromatic compound can be transferred to a monohalogenated or nonhalogenated aromatic compound by reaction in the presence of ruthenium as the element or in the form of compounds and if desired with one or more metal compounds from subgroups I and II of the Periodic Table.Type: GrantFiled: December 11, 1991Date of Patent: October 20, 1992Assignee: Bayer AktiengesellschaftInventors: Franz-Josef Mais, Helmut Fiege
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Patent number: 5108647Abstract: A method of dehalogenating a halogenated hydrocarbon in the presence of a nucleophilic reaction partner, comprising dispersing the halogenated hydrocarbon by chemical reaction (DCR), and dehalogenating the resulting finely dispersed reaction product by means of a strictly chemical conversion with the nucleophilic reaction partner at a temperature between ambient temperature and approximately 510.degree. C.Type: GrantFiled: March 26, 1991Date of Patent: April 28, 1992Inventor: Friedrich Bolsing
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Patent number: 5026931Abstract: Disclosed is a process comprising preparing a product stream rich in naphthalene and 2-monoiodonaphthalene comprising contacting hydrogen and a feed stream containing iodonaphthalenes selected from the group consisting of monoiodonaphthalene, diiodonaphthalene and triiodonaphthalene and mixtures thereof with an X or Y type zeolite containing an ion selected from the group consisting of sodium, potassium and rubidium and a metal selected from the group selected from the group consisting of palladium, platinum, rhodium and ruthenium.Type: GrantFiled: September 10, 1990Date of Patent: June 25, 1991Assignee: Eastman Kodak CompanyInventors: Victor H. Agreda, Thomas H. Larkins, Jr.
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Patent number: 5023317Abstract: The invention is a chemical process for complete destruction and safe disposition of hazardous organic chemicals carbonaceous chemicals. The invention also comprises the process for production of an inert polymer formed essentially of Carbon and Sulfur, and also comprises the new inert polymer, itself and articles made of the new polymer. This new polymer has many of the properties of refractory materials and is an inert non-inflammable cross-linked polymer that is relatively insoluble in all generally known solvents. In the process of the invention, a carbonaceous chemical and Sulfur is heated, in an atmosphere of Nitrogen at 500.degree. to 1500.degree. C. Waste gases including sulfur and sulfides are condensed, scrubbed and the sulfur recycled. The solids residue when analyzed by a mass spectrometer contains less than one (1) part per million (1 ppm) of unreacted organic chemical.Type: GrantFiled: March 21, 1990Date of Patent: June 11, 1991Assignee: Sultech, Inc.Inventor: Harold W. Adams
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Patent number: 4960962Abstract: ar-Bromoaromatics having an alkenyl side chain on the aromatic nucleus are formed by feeding a beta-bromoalkyl-ar-bromoaromatic compound, together with a substantial excess of water, into a thermal dehydrobromination zone held at or above 475.degree. C., and maintaining a very short residence time (5 seconds or less) in the dehydrobromination zone. Very little extraneous co-products are formed. For example dibromostyrene was produced by co-feeding bromoethyldibromobenzene (BEDB) and excess amounts of water (using nitrogen as a carrier gas) into a Vycor tube packed with glass beads at 500.degree. C. By suitable controlling residence times, the amount of undesired coproducts formed was kept below 1.5 G. C. area %, and the percentage of BEDB conversion was in the range of 84.1% up to 99.1%.Type: GrantFiled: July 19, 1989Date of Patent: October 2, 1990Assignee: Ethyl CorporationInventor: David R. Brackenridge
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Patent number: 4925966Abstract: A trifluorobenzene compound represented by the general formula (I): ##STR1## wherein Z represents a cyano group or a carboxyl group, and a process for producing said compounds.Type: GrantFiled: September 14, 1988Date of Patent: May 15, 1990Assignee: SDS Biotech K.K.Inventors: Hiroshi Kobayashi, Masaaki Shimizu
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Patent number: 4921936Abstract: The invention is a chemical process for complete destruction and safe disposition of hazardous organic carbonaceous chemicals. The invention also comprises the process for production of an inert polymer formed essentially of Carbon and Sulfur, and also comprises the new inert polymer, itself and articles made of the new polymer. This new polymer has many of the properties of refractory materials and is an inert non-inflammable cross-linked polymer that is relatively insoluble in all generally known solvents. In the process of the invention, a carbonaceous chemical and Sulfur is heated, in an atmosphere of Nitrogen at 500.degree. to 1500.degree. C. Waste gases including sulfur and sulfides are condensed, scrubbed and the sulfur recycled. The solids residue when analyzed by a mass spectrometer contains less than one (1) part per million (1 ppm) of unreacted organic chemical.Type: GrantFiled: April 1, 1986Date of Patent: May 1, 1990Assignee: Sultech, Inc.Inventor: Harold W. Adams
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Patent number: 4910353Abstract: Polychlorobiphenyls and other toxic halogenated polyaromatic substances such as various halogenated pesticides, herbicides, and the like, are dehalogenated through the use of a strong base and various sulfur-containing compounds. The dechlorinated residues either form polymers which are insoluble in aliphatic hydrocarbons and can thus be easily separated as through filtration, or can be separated from the solvent by distillation. The residues can be readily and safely disposed of as in an approved dump, or burned.Type: GrantFiled: May 11, 1984Date of Patent: March 20, 1990Assignee: Transformer Service, Inc.Inventor: John R. Siegman
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Patent number: 4898998Abstract: A process for producing brominated acenaphthylene condensates of the formula: ##STR1## wherein x is 1 or 2, y is an integer from 1 to 6 and n is 1 or more, from elementary units of the following formulas: ##STR2## wherein y is as defined above, comprising, (A) brominating the side chain of the acenaphthene with 0.2 to 2.0 times as many moles of bromine as acenaphthene, said bromination initiated by ultraviolet radiation or by a radical initiator in a halogenated hydrocarbon solvent, (B) adding a Lewis acid catalyst to the reaction solution of step (A) to promote the condensation of the brominated acenaphthene product of step (A), (C) adding to the reaction solution of step (B) an equimolar or more amount of bromine relative to the amount of acenaphthene starting material, to further brominate and condense the brominated acenaphthene and/or brominated acenaphthene condensates; and (D) dehydrobrominating the brominated acenaphthene condensates.Type: GrantFiled: May 31, 1984Date of Patent: February 6, 1990Assignee: Toyo Soda Manufacturing Co., Ltd.Inventors: Masashige Kubo, Hideo Sakka, Yukihiro Tsutsumi
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Patent number: 4895992Abstract: A process for iodinating aromatic compounds by reacting an aromatic compound with oxygen at low temperatures in the presence of a non-acid catalyst containing an oxidation catalyst. The catalyst may be regenerated by heating the catalyst in the presence of oxygen.Type: GrantFiled: September 19, 1988Date of Patent: January 23, 1990Assignee: Eastman Kodak CompanyInventors: Mark Rule, Gerald C. Tustin, Donald L. Carver, Jerry S. Fauver
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Patent number: 4886922Abstract: A method for preparing an .alpha.-substituted styrene such as 2-(3,5-dichlorophenyl)-4,4,4-trichloro-1-butene comprising contacting, an .alpha.-haloalkylbenzene such as 3-(3,5-dichlorophenyl)-1,1,1,3-tetrachlorobutane with a catalyst consisting essentially of .gamma.-alumina dried to a moisture content between about zero to about 12% by weight, the .gamma.-alumina serving to catalyze the dehydrohalogenation of the .alpha.-haloalkylbenzene to produce the .alpha.-substituted styrene.Type: GrantFiled: September 14, 1984Date of Patent: December 12, 1989Assignee: The Dow Chemical CompanyInventors: Dennis K. Klipa, James R. Dewald
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Patent number: 4844745Abstract: Removal and/or clean-up of polychlorinated biphenyls (PCBs) from contaminated surfaces with novel compositions of petroleum distillates and wetting agents.Type: GrantFiled: October 12, 1988Date of Patent: July 4, 1989Assignee: Integrated Chemistries, Inc.Inventors: James E. Nash, Kurt E. Heikkila
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Patent number: 4827057Abstract: 1,2-Dichlorobenzene can be prepared by reacting 1,2,4-trichlorobenzene in the gas phase with hydrogen. The reaction is carried out at a temperature from the boiling point of the starting material up to about 400.degree. C. and over a platinum-spinel catalyst.Type: GrantFiled: July 14, 1988Date of Patent: May 2, 1989Assignee: Bayer AktiengesellschaftInventors: Josef Kasbauer, Helmut Fiege, Herbert Schmidt, Karlfried Wedemeyer
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Patent number: 4822929Abstract: The invention concerns a process for the catalytic trans-halogenation of a poly-iodo-benzene, wherein said poly-iodo-benzene is made to react with benzene and with oxygen, in the presence of a zeolite of the PENTASIL type, exchanged with a metal of the II, III or IV group of the periodical system and anyway present in forms different from the acidic form.Type: GrantFiled: August 5, 1987Date of Patent: April 18, 1989Assignee: Montedipe S.p.A.Inventor: Giuseppe Paparatto
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Patent number: 4816609Abstract: An unsaturated halohydrocarbon such as vinylidene chloride is produced by the dehydrohalogenation of haloalkanes such as 1,1,1-trichloroethane or 1,1,2-trichloroethane, in the presence of a novel mixed salt catalyst containing a Group IA metal cation such as Cs, a Group IIA metal cation such as Mg and a neutralizing number of counter anions such as chloride distributed on a support such as silica.Type: GrantFiled: May 26, 1987Date of Patent: March 28, 1989Assignee: The Dow Chemical CompanyInventor: A. Dale Harley
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Patent number: 4808759Abstract: The invention concerns a process for the catalytic trans-halogenation of a poly-iodo-benzene, wherein said poly-iodo-benzene is made to react with benzene and with oxygen, in the presence of a zeolite of the X type or of the Y type, exchanged with an alkali metal, with thallium or with a rare earth and anyway present in a form different from the acidic form.Type: GrantFiled: August 5, 1987Date of Patent: February 28, 1989Assignee: Montedipe S.p.A.Inventor: Giuseppe Paparatto
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Patent number: 4792642Abstract: Disclosed is a process for iodinating aromatic compounds by reacting an aromatic compound with oxygen at low temperatures in the presence of a non-acid catalyst containing an oxidation catalyst.Type: GrantFiled: March 25, 1987Date of Patent: December 20, 1988Assignee: Eastman Kodak CompanyInventors: Mark Rule, Gerald C. Tustin, Donald L. Carver, Jerry S. Fauver
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Patent number: 4749817Abstract: Polychlorobenzenes are selectively dechlorinated to dichlorobenzenes and monochlorobenzene in the vapor phase in the presence of a sulfided palladium or platinum catalyst. The reaction may be carried out at a temperature of from 225.degree. C. to 450.degree. C., preferably at atmospheric pressure, with an equimolar ratio of hydrogen and polychlorobenzene, and a space velocity of 0.5 to 5 wt. feed/wt. catalyst-hour. Only small amounts of benzene are formed.Type: GrantFiled: August 22, 1986Date of Patent: June 7, 1988Assignee: Standard Chlorine of Delaware, Inc.Inventors: Jacob George, Thomas A. Del Prato, Nicola A. Stufano
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Patent number: 4748286Abstract: The invention relates to an improved process for the production of crystalline tribromostyrene. The process involves removal of hydrogen bromide in a two phase system with the aid of phase transfer catalysts. One of the phases used is an aqueous one containing an alkali metal hydroxide whereas the second comprises .beta.-bromoethyltribromobenzene in an alcohol as solvent.Type: GrantFiled: July 21, 1987Date of Patent: May 31, 1988Assignee: Yeda Research & Development Co. Ltd.Inventors: Stephen L. J. Daren, David Vofsi, Aurelia Finkels
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Patent number: 4731493Abstract: Process for producing condensed bromoacenaphthylene comprising:(A) a step of brominating and condensating acenaphthene with bromine in a halogenated hydrocarbon solvent in the presence of a Lewis acid catalyst;(B) a step of removing the Lewis acid catalyst and then continuing the bromination with bromine with an added radical initiator; and(C) a step of carrying out dehydrobromination reaction.In a modified process, the bromination is effected in a halogenated hydrocarbon solvent at a temperature not lower than 60.degree. C. using bromine at least 3 times as much in moles as acenaphthene in the presence of an iron catalyst.Further, the condensed bromoacenaphthylene is purified by bringing it into contact with an adsorbent in an organic solvent.Type: GrantFiled: January 16, 1986Date of Patent: March 15, 1988Assignee: Toyo Soda Manufacturing Co., Ltd.Inventors: Masashige Kubo, Mitsuaki Yoshimitsu, Yukihiro Tsutsumi
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Patent number: 4618686Abstract: Process for the dehalogenation of aryl and alpha-araliphatic halides comprising contacting the aryl halide or alpha-araliphatic halide with hypophosphite salt, in the presence of a catalytic amount of a noble metal catalyst. This process is useful in the field of organic synthesis and for the removal of environmentally hazardous aryl and alpha-araliphatic halides, including polychlorinated biphenyls and dibenzo-p-dioxins.Type: GrantFiled: September 27, 1984Date of Patent: October 21, 1986Assignee: Ciba-Geigy CorporationInventor: Stephen K. Boyer
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Patent number: 4581442Abstract: The invention is a chemical process for complete destruction and safe disposition of hazardous organic chemicals such as Polychlorinated Biphenyl (PCB). The invention also comprises the process for production of an inert polymer formed of essentially equal parts of Carbon and Sulfur, and also comprises the new inert polymer, itself and articles made of the new polymer. This new polymer has many of the properties of refractory materials and is an inert non-inflammable cross-linked polymer that is relatively insoluble in all generally known solvents. In the process of the invention PCB and Sulfur are heated, in an atmosphere of Nitrogen at 500.degree. to 1500.degree. C. Waste gases including sulfur and sulfides are condensed, scrubbed and the sulfur recycled. The solids residue when analyzed by a mass spectrometer contains less than one (1) part per million (1 ppm) of unreacted polychlorinated biphenyl (PCB).Type: GrantFiled: August 27, 1984Date of Patent: April 8, 1986Inventor: Harold W. Adams
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Patent number: 4558166Abstract: Process for the preparation of benzal chlorides from benzotrichlorides, according to which benzotrichlorides are reacted with thiols in the presence of metal salts at elevated temperatures.Type: GrantFiled: March 21, 1984Date of Patent: December 10, 1985Assignee: Bayer AktiengesellschaftInventors: Bernd Baasner, Erich Klauke
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Patent number: 4410422Abstract: A method is provided for reducing the level of polychlorinated aromatic hydrocarbons, "PCB's", while dissolved in an organic solvent, for example, transformer oil. Removal of polychlorinated aromatic hydrocarbon from the contaminated organic solvent can be accomplished by treating the contaminated solution with a mixture of alkali mercaptide in the presence of a phase transfer catalyst.Type: GrantFiled: October 23, 1981Date of Patent: October 18, 1983Assignee: General Electric CompanyInventor: Daniel J. Brunelle
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Patent number: 4400552Abstract: A reagent comprising the product of the reaction of an alkali metal hydroxide with a polyglycol or a polyglycol monoalkyl ether and oxygen, effects complete decomposition of halogenated organic compounds, such as polychlorinated biphenyls (PCBs), when mixed therewith in the presence of oxygen.Type: GrantFiled: March 5, 1981Date of Patent: August 23, 1983Assignee: The Franklin InstituteInventors: Louis L. Pytlewski, Kenneth Krevitz, Arthur B. Smith
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Patent number: 4377471Abstract: A method is provided for effecting the removal of polychlorinated biphenyls from hydrocarbon oils, such as transformer oil, contaminated with more than 50 ppm of such polychlorinated biphenyls. There is utilized in the contaminated oil, while it is being agitated, dispersed metallic sodium, an aprotic ion-complexing solvent, for example, diglyme, and an oil-soluble electron carrier, such as naphthalene.Type: GrantFiled: December 3, 1980Date of Patent: March 22, 1983Assignee: General Electric CompanyInventors: John F. Brown, Marie E. Lynch