Transition Metal Halide Containing Catalyst Patents (Class 570/168)
-
Patent number: 5395996Abstract: 1,1,1,2-tetrafluoroethane (HFA 134a) is manufactured from trichloroethylene by a two-stage process comprising reacting trichloroethylene with hydrogen fluoride under superatmospheric pressure in a first reaction zone to form 1,1,1-trifluoro-2-chloroethane (133a) and reacting the 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride in a second reaction zone to form 1,1,1,2-tetrafluoroethane; the entire product stream from the 133a reaction zone together with additional HF of required is fed through the 134a reaction zone. The two reaction zones may be provided within a single reaction vessel.Type: GrantFiled: February 1, 1993Date of Patent: March 7, 1995Assignee: Imperial Chemical Industries plcInventors: John D. Scott, Rachel A. Steven
-
Patent number: 5395998Abstract: In a process for preparing 1,1,1-trifluorochloroethane by reacting, in a gas phase, trichloroethylene and hydrogen fluoride, when the reactant gases are diluted with a gas which is inactive to the reaction, it is very easy to control a reaction temperature, and when a generated gas from the reaction of 1,1,1-trifluorochloroethane and hydrogen fluoride is used as a diluent gas, generation of 1,1-difluoroethylene is suppressed to a very low level while not influencing the reaction between trichloroethylene and hydrogen fluoride.Type: GrantFiled: January 28, 1994Date of Patent: March 7, 1995Assignee: Daikin Industries, Ltd.Inventors: Satoshi Koyama, Yukio Homoto, Naoki Esaka
-
Patent number: 5395997Abstract: The invention relates to a process for preparing hydrofluorocarbons of the formulas CF.sub.3 (CH.sub.2 CF.sub.2).sub.n F comprising reacting at least one reactant selected from CCl.sub.3 (CH.sub.2 CCl.sub.2).sub.n Cl, CCl.sub.3 (CH.sub.2 CF.sub.2).sub.n Cl or CCl.sub.2 [(CH.sub.2 CF.sub.2)Cl].sub.2, where n=1 to 3, with hydrogen fluoride at a temperature of from about 25.degree. to about 200.degree. C.Type: GrantFiled: July 29, 1993Date of Patent: March 7, 1995Assignee: AlliedSignal Inc.Inventors: Michael Van Der Puy, G. V. Bindu Madhavan, Timothy R. Demmin
-
Patent number: 5382722Abstract: 1,1,1,2-tetrafluoroethane (HFA 134a) is manufactured from trichloroethylene by a two-stage process comprising reacting trichloroethylene with hydrogen fluoride in one reactor to form 1,1,1-trifluoro-2-chloroethane (133a) and reacting the 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride in another reactor to form 1,1,1,2-tetrafluoroethane. The invention is characterized by reversing the reactor sequence and passing the entire product stream from the HFA 134a reactor together with trichloroethylene through the 133a reactor and separating 134a and hydrogen chloride from the recycle stream between the 133a reactor and the 134a reactor.Type: GrantFiled: June 30, 1993Date of Patent: January 17, 1995Assignee: Imperial Chemical Industries PLCInventors: John D. Scott, Rachel A. Steven
-
Patent number: 5382721Abstract: Process for the preparation of 1,1,1,2-tetrafluoroethane by reaction of hydrogen fluoride with a trihaloethylene according to which trifluoroethylene is chosen as trihaloethylene and the reaction is carried out in the liquid phase.Type: GrantFiled: June 7, 1993Date of Patent: January 17, 1995Assignee: Solvay (Societe Anonyme)Inventors: Pascal Pennetreau, Francine Janssens, Max Braun, Johannes Eicher, Werner Rudolph, Eckhard Hausmann
-
Patent number: 5376333Abstract: Compositions of ethylene oxide and monochlorotetrafluoroethane which are useful as sterilizing agents. These novel compositions are environmentally acceptable, possess improved flammability suppressant characteristics, and are capable of maintaining a greater ethylene oxide concentration than traditional sterilizing gas compositions.Type: GrantFiled: July 28, 1989Date of Patent: December 27, 1994Assignee: AlliedSignal, Inc.Inventors: Ian R. Shankland, David P. Wilson, Rajat S. Basu
-
Patent number: 5367103Abstract: 1,1,1.Trifluoro-2-fluoroethane (HFC 134A), respectively 1,1,1-trifluoro-2, 2-dichloroethane (HCFC 123) 1,1,1-trifluoro-2-chloro, 2-fluoroethane (HCFC 124) and pentafluoroethane (HFC 125), are purified from impurities respectively consisting of 1,1-difluoro-2-chloroethylene (HCFC 1122) and of difluorodichloroethylene (CFC 1112A and CFC 1112), by reacting in the liquid state respectively HFC 134A or HCFC 123, HCFC 124 and HFC 125 containing the relative impurities, with elemental fluorine, at temperatures ranging from -80.degree. to -40.degree. C.Type: GrantFiled: December 22, 1992Date of Patent: November 22, 1994Assignee: Ausimont S.p.A.Inventors: Giorgio Guglielmo, Giampaolo Gambaretto
-
Patent number: 5354916Abstract: The invention relates to a process for selectively producing alkyl halides from alkanes, such as methane and ethane at low temperatures and low pressures. Optional hydrolysis to the corresponding alcohols may follow. The process involves adding an alkane and an added halogen source to an aqueous solution in a homogeneous system in the presence of a transition metal halide containing complex, for a time, under conditions and in effective amounts that will permit the formation of alkyl monohalides.Type: GrantFiled: January 24, 1994Date of Patent: October 11, 1994Assignee: Exxon Research and Engineering CompanyInventors: Istvan T. Horvath, John M. Millar, Raymond A. Cook
-
Patent number: 5354927Abstract: A process for preparing 1,1,1-trifluoro-2,2-dichloroethane by hydrofluorination,in the gas phase, of perchloroethylene in the presence of a catalyst comprising chrome oxides supported on AlF.sub.3 in the gamma and/or beta form.Type: GrantFiled: June 7, 1993Date of Patent: October 11, 1994Assignee: Ausimont S.p.A.Inventors: Diego Carmello, Giorgio Guglielmo
-
Patent number: 5345016Abstract: This invention provides an improved process for the manufacture of 1,1,1,2-tetrafluoroethane by the reaction of HF and trichloroethylene in the presence of a catalyst to form a mixture comprising 2-chloro-1,1,1-trifluoroethane and 1,1,1,2-tetrafluoroethane and, optionally, other organic by-products. The improvement resides in conducting the reaction in a single reaction zone while recovering the 1,1,1,2-tetrafluoroethane from the mixture and recycling the 2-chloro-1,1,1-trifluoroethane and, optionally, other organic by-products from the mixture to the reaction along with trichloroethylene and HF.Type: GrantFiled: February 4, 1993Date of Patent: September 6, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventor: Leo E. Manzer
-
Patent number: 5336816Abstract: A more efficient reaction mechanism is provided for producing 1,1-dichloro-1-fluoroethane (HCFC-141b) by reacting vinylidene chloride with hydrogen fluoride in the liquid phase in the presence of a catalyst and sulfone-based or nitrated solvent. In particular, by using a titanium tetrafluoride catalyst in conjunction with tetramethylene sulfone solvent, most all the vinylidene chloride reagent can be converted to HCFC-141b to the virtual exclusion of unwanted, closely associated byproducts like 1,1-difluoro-1-chloroethane (HCFC-142b) 1,1,1-trifluoroethane (HFC-143a), while reducing the production of tars to a minimum.Type: GrantFiled: December 17, 1992Date of Patent: August 9, 1994Assignee: Laroche Chemicals, Inc.Inventors: Betty J. Achord, C. Bradford Boyce
-
Patent number: 5336817Abstract: A method of preparing CH.sub.2 FCF.sub.3 from fluorodichloro-ethylene using a catalytically active niobium, tantalum or molybdenum fluorosulfonate compound or a catalyst mixture which comprises a niobium, tantalum or molybdenum halide and a sulfonic acid derivative.Type: GrantFiled: September 25, 1992Date of Patent: August 9, 1994Assignee: Solvay Fluor und Derivate GmbHInventors: Johannes Eicher, Karl-Heinz Fazniewscy, Matthias Rieland, Werner Rudolph
-
Patent number: 5334784Abstract: Water present in a hot gaseous product stream from a reactor system A,B (FIG. 1 ) containing hydrogen fluoride is separated from the stream in order to eliminate a potentially corrosive combination of water and HF. The water is removed by contacting the gaseous product stream with liquid HF in a distillation column so as to obtain a bottoms product containing liquid HF and water and a top product containing dry HF and the product to be recovered. The invention encompasses the separation process, a vessel for carrying out the process (FIGS. 2 to 4), a control system for the liquid HF supply to the distillation column (FIGS. 5 and 6) and a recovery system for recovering HF employed during operation of the reactor system in different regimes employing HF as a fluorination agent, as a diluent during catalyst regeneration and/or catalyst prefluorination (FIG. 7 ).Type: GrantFiled: December 9, 1992Date of Patent: August 2, 1994Assignee: Imperial Chemical Industries PLCInventors: Charles B. Blake, James M. Forsyth, Ann S. Liow, Stephen J. Adams, Ralph J. Doy, Rowland J. P. Brierley, Jane A. E. Roberts, Brian Schofield, Neil D. Shilling
-
Patent number: 5334786Abstract: In a process for preparing 1,1,1-trifluorochloroethane by reacting, in a gas phase, trichloroethylene and hydrogen fluoride, when the reactant gases are diluted with a gas which is inactive to the reaction, it is very easy to control a reaction temperature, and when a generated gas from the reaction of 1,1,1-trifluorochloroethane and hydrogen fluoride is used as a diluent gas, generation of 1,1-difluoroethylene is suppressed to a very low level while not influencing the reaction between trichloroethylene and hydrogen fluoride.Type: GrantFiled: January 27, 1993Date of Patent: August 2, 1994Assignee: Daikin Industries, Ltd.Inventors: Satoshi Koyama, Yukio Homoto, Naoki Esaka
-
Patent number: 5321170Abstract: A process is disclosed for producing HFC-134a which includes reacting certain tetrahaloethane starting materials (e.g., 2-chloro-1,1,1-trifluoroethane) with HF in the gaseous phase at an elevated temperature in the presence of certain supported metal catalysts containing effective amounts of zinc. A catalyst of metal fluoride on a fluorinated alumina support having an atomic ratio of F to Al of at least 2.7:1 and containing .beta.-aluminum fluoride, is employed.Type: GrantFiled: March 20, 1991Date of Patent: June 14, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventors: David R. Corbin, V. N. Mallikarjuna Rao
-
Patent number: 5315047Abstract: 1,1,1,4,4,4-Hexafluorobutane is prepared by first reacting 1,1,3,4,4-pentachlorobuta-1,3-diene with hydrogen fluoride in the presence of catalysts at 60.degree. to 180.degree. C. to give 1,1,1,4,4,4-hexafluoro-2-chlorobutane, and converting this to 1,1,1,4,4,4-hexafluorobutane. On working up the product of the first stage of the process, it is possible to isolate novel compounds of formula (I):CF.sub.2 X--CH.sub.2 --R (I)in whichX is fluorine or chlorine andR is --CHCl--CF.sub.2 Cl, --CHCl--CFCl.sub.2 or --CCl.dbd.CCl.sub.2.Type: GrantFiled: April 15, 1993Date of Patent: May 24, 1994Assignee: Bayer AktiengesellschaftInventors: Norbert Lui, Albrecht Marhold, Dietmar Bielefeldt
-
Patent number: 5300711Abstract: A process is disclosed for producing HCFC-123, HCFC-124 and/or HFC-125 which includes reacting certain tetrahaloethylene starting materials (e.g., tetrachloroethylene) with HF in the gaseous phase at an elevated temperature in the presence of certain supported metal catalysts containing effective amounts of zinc. A catalyst of metal fluoride on a fluorinated alumina support having an atomic ratio of F to Al of at least 2.7:1 and containing .beta.-aluminum fluoride, is employed.Type: GrantFiled: March 20, 1991Date of Patent: April 5, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventors: David R. Corbin, V. N. Mallikarjuna Rao
-
Patent number: 5300710Abstract: A process is disclosed for producing HCFC-124 and HFC-125 which includes reacting certain pentahaloethane starting materials (e.g., CF.sub.3 CHCl.sub.2) in the gaseous phase at an elevated temperature in the presence of certain supported metal catalysts containing effective amounts of zinc. A catalyst of metal fluoride on a fluorinated alumina support having an atomic ratio of F to Al of at least 2.7:1 and containing .beta.-aluminmum fluoride, is employed.Type: GrantFiled: March 20, 1991Date of Patent: April 5, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventors: David R. Corbin, V. N. Mallikarjuna Rao
-
Patent number: 5283381Abstract: A process for preparing fluorine-containing ethane derivatives using hydrogen fluoride and a catalytically active formulation comprising a tantalum fluorosulfonate compound or a niobium fluorosulfonate compound is described. The process is particularly suitable for preparing ethane derivatives which contain a CF.sub.3 group, for example for preparing CF.sub.3 CHCl.sub.2 (R123) from perchloroethylene.Type: GrantFiled: April 26, 1993Date of Patent: February 1, 1994Assignee: Solvay Fluor und Derivate GmbHInventors: Johannes Eicher, Karl-Heinz Fazniewscy, Werner Rudolph
-
Patent number: 5283382Abstract: Process for the preparation of fluorinated alkanes by contacting a starting material of halogenated alkene or alkane with 1 to 150 molar equivalents based on catalyst of HF, 1 to 30 molar equivalents based on catalyst of a dehydrating agent and less than 100 molar equivalents based on catalyst of a starting material, the catalyst being selected from niobium oxide or tantalum oxide, at a temperature of 0.degree. C. to 185.degree. C. The preferred dehydrating agent is a combination of chlorosulfonic acid and thionyl chloride.Type: GrantFiled: October 23, 1992Date of Patent: February 1, 1994Assignee: E. I. du Pont de Nemours and CompanyInventor: Mario J. Nappa
-
Patent number: 5276224Abstract: A process for preparing 1,1,1-trifluoro-2,2-dichloroethane by hydrofluorination, in the gas phase, of perchloroethylene in the presence of a catalyst comprising chrome oxides supported on AlF.sub.3 in the gamma and/or beta form.Type: GrantFiled: November 25, 1992Date of Patent: January 4, 1994Assignee: Ausimont S.p.A.Inventors: Diego Carmello, Giorgio Guglielmo
-
Patent number: 5264639Abstract: A process for producing a 2,2-difluoropropane of the following formula (2), which comprises fluorinating a chlorine-containing 2,2-halogenopropane of the following formula (1) by hydrogen fluoride or a fluorinating agent:C.sub.3 H.sub.a Cl.sub.b F.sub.c (1)C.sub.3 H.sub.a Cl.sub.b-x F.sub.c+x (2)wherein a, b, c and x are integers satisfying the following conditions:a.gtoreq.0, b.gtoreq.1, c.gtoreq.0, x.gtoreq.1, a+b+c=8.Type: GrantFiled: May 20, 1992Date of Patent: November 23, 1993Assignee: Asahi Glass Company Ltd.Inventors: Shinsuke Morikawa, Shunichi Samejima, Hidekazu Okamoto, Keiichi Ohnishi, Shin Tatematsu, Toshihiro Tanuma, Takashi Ohmori
-
Patent number: 5262574Abstract: A process for preparing 1,1,1-trifluoro-2,2-dichloroethane by hydrofluorination, in the gas phase, of perchloroethylene in the presence of a catalyst comprising chrome oxides supported on AlF.sub.3 in the gamma and/or beta form.Type: GrantFiled: November 18, 1991Date of Patent: November 16, 1993Assignee: Ausimont S.p.A.Inventors: Diego Carmello, Giorgio Guglielmo
-
Patent number: 5258561Abstract: A chlorofluorination process is disclosed which employs a catalyst comprising chromium oxide for producing halohydrocarbons of the formula CHXFCF.sub.3 (where X is selected from Cl and F). The process is characterized by feeding a combination of components comprising, (i) at least one halohydrocarbon starting compound of the formula CY.sub.3 CH.sub.2 R.sup.1 (where R.sup.1 is selected from the group of H and F and each Y is independently selected from the group of Cl and F), (ii) hydrogen fluoride and (iii) chlorine to a reaction zone; contacting said combination of compounds in said reaction zone with a catalyst comprising chromium oxide at an elevated temperature to produce reaction zone products containing halohydrocarbon reaction products of the formula CHXFCF.sub.3 together with halohydrocarbons of the formula CZ.sub.3 CHR.sup.2 R.sup.3 (wherein R.sup.2 is selected from the group of H and Cl, R.sup.Type: GrantFiled: November 6, 1992Date of Patent: November 2, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Mario J. Nappa, V. N. Mallikarjuna Rao
-
Patent number: 5243105Abstract: 1,1,1,2-tetrafluoroethane (HFA 134a) is manufactured from trichloroethylene by a two-stage process comprising reacting trichloroethylene with hydrogen fluoride under superatmospheric pressure in a first reaction zone to form 1,1,1-trifluoro-2-chloroethane (133a) and reacting the 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride in a second reaction zone to form 1,1,1,2-tetrafluoroethane; the entire product stream from the 133a reaction zone together with additional HF of required is fed through the 134a reaction zone. The two reaction zones may be provided within a single reaction vessel.Type: GrantFiled: December 11, 1991Date of Patent: September 7, 1993Assignee: Imperial Chemical Industries PLCInventors: John D. Scott, Rachel A. Steven
-
Patent number: 5243107Abstract: 1,1,1,2-tetrafluoroethane (HFA 134a) is manufactured from trichloroethylene by a two-stage process comprising reacting trichloroethylene with hydrogen fluoride in one reactor to form 1,1,1-trifluoro-2-chloroethane (133a) and reacting the 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride in another reactor to form 1,1,1,2-tetrafluoroethane. The invention is characterised by reversing the reactor sequence and passing the entire product stream from the HFA 134a reactor together with trichloroethylene through the 133a reactor and separating 134a and hydrogen chloride from the recycle stream between the 133a reactor and the 134a reactor.Type: GrantFiled: September 5, 1991Date of Patent: September 7, 1993Assignee: Imperial Chemical Industries PLCInventors: John D. Scott, Rachel A. Steven
-
Patent number: 5233105Abstract: Bismuth/alkaline earth metal catalysts which contain 0.005-0.8 g-atom of bismuth per mol of the alkaline earth metal compound employed and can furthermore contain promoters and/or inert additives, and lanthanide catalysts with or without catalyst supports can be employed as catalysts for halogen-fluorine exchange in organic compounds by means of hydrogen fluoride.Type: GrantFiled: October 25, 1990Date of Patent: August 3, 1993Assignee: Bayer AktiengesellschaftInventors: Hans-Helmut Schwarz, Rudolf Braden
-
Patent number: 5227546Abstract: A process for preparing fluorine-containing ethane derivatives using hydrogen fluoride and a catalytically active formulation comprising a tantalum fluorosulfonate compound or a niobium fluorosulfonate compound is described. The process is particularly suitable for preparing ethane derivatives which contain a CF.sub.3 group, for example for preparing C.sub.3 CHCl.sub.2 (R123) from perchloroethylene.Type: GrantFiled: September 8, 1992Date of Patent: July 13, 1993Assignee: Solvay Fluor und Derivate GmbHInventors: Johannes Eicher, Karl-Heinz Fazniewscy, Werner Rudolph, Hans-Walter Swidersky
-
Patent number: 5227350Abstract: A method for regenerating a used fluorination catalyst such as a chromium-containing compound comprises contacting the used catalyst at a temperature of 300.degree. C. to 500.degree. C. with a mixture of an oxidizing agent, especially air, and hydrogen fluoride and optionally an inert diluent such as nitrogen, said mixture containing up to 30% of oxidizing agent on a molar basis. The method obviates chromium loss during regeneration/refluorination of spent catalyst and provides heated hydrogen fluoride for use directly in fluorination reactions.Type: GrantFiled: July 17, 1992Date of Patent: July 13, 1993Assignee: Imperial Chemical Industries PLCInventors: John D. Scott, Pravin K. Dattani
-
Patent number: 5214223Abstract: A method of preparing fluorine-containing ethane derivatives using a catalyst mixture which comprises a metal halide and a sulfonic acid derivative is described. The method is particularly well suited for preparing CF.sub.3 CHCl.sub.2 (R123) from perchloroethylene and for preparing CF.sub.3 CH.sub.2 F (R134a) from trifluoroethylene.Type: GrantFiled: July 14, 1992Date of Patent: May 25, 1993Assignee: Kali-Chemie AGInventors: Johannes Eicher, Karlheinz Fazniewscy, Werner Rudolph, Hans-Walter Swidersky
-
Patent number: 5202509Abstract: The catalysts according to the invention are mixtures of an antimony trihalide and of a titanium tetrahalide.These catalysts can be used for the liquid phase fluorination of halogenated aliphatic hydrocarbons, especially that of chlorinated ethane and ethylene derivatives.Type: GrantFiled: May 20, 1992Date of Patent: April 13, 1993Assignee: Societe AtochemInventors: Charles Laviron, Andre Lantz
-
Patent number: 5196615Abstract: Process for the preparation of fluorinated alkanes by contacting halogenated alkanes with HF in the presence of TaCl.sub.5 or TaBr.sub.5.Type: GrantFiled: August 22, 1990Date of Patent: March 23, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: V. N. Mallikarjuna Rao
-
Patent number: 5185482Abstract: This invention provides an improved process for the manufacture of 1,1,1,2-tetrafluoroethane by the reaction of HF and trichloroethylene in the presence of a catalyst to form a mixture comprising 2-chloro-1,1,1-trifluoroethane and 1,1,1,2-tetrafluoroethane and, optionally, other organic by-products. The improvement resides in conducting the reaction in a single reaction zone while recovering the 1,1,1,2-tetrafluoroethane from the mixture and recycling the 2-chloro-1,1,1-trifluoroethane and, optionally, other organic by-products from the mixture to the reaction along with trichloroethylene and HF.Type: GrantFiled: January 17, 1992Date of Patent: February 9, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Leo E. Manzer
-
Patent number: 5177273Abstract: A vapor phase process is disclosed for producing HCFC-225s, HCFC-235s, HCFC-226s, HFC-236s, and HFC-227s by reacting certain three-carbon reactants containing at least one less fluorine than, and at least as many hydrogen substituents as the desired product (e.g. propane propylene, allene or methylacetylene) with Cl.sub.2 and HF in the presence of a catalyst consisting essentially of chromium oxide or of chromium oxide which is combined with a refractory oxide, fluorinated and/or modified with manganese, iron, cobalt, nickel, copper and/or zinc. The temperature and contact time for the reaction are chosen to provide a product having the desired fluorine and hydrogen content.Type: GrantFiled: February 1, 1991Date of Patent: January 5, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Douglas W. Bruhnke, Jan J. Lerou, V. N. Mallikarjuna Rao, William C. Seidel, Frank J. Weigert
-
Patent number: 5171900Abstract: A method of preparing fluorine-containing ethane derivatives using a catalyst mixture which comprises a metal halide and a sulfonic acid derivative is described. The method is particularly well suited for preparing CF.sub.3 CHCl.sub.2 (R123) from perchloroethylene and for preparing CF.sub.3 CH.sub.2 F (R134a) from trifluoroethylene.Type: GrantFiled: April 11, 1991Date of Patent: December 15, 1992Assignee: Kali-Chemie AGInventors: Johannes Eicher, Karlheinz Fazniewscy, Werner Rudolph, Hans-Walter Swidersky
-
Patent number: 5171901Abstract: Hexafluoropropanes of the formula CF.sub.3 -CHX-CF.sub.3 where X is hydrogen or chlorine are prepared by reacting hexachloropropene with hydrogen fluoride in the gas phase in the presence of a catalyst.Type: GrantFiled: December 5, 1991Date of Patent: December 15, 1992Assignee: Bayer AktiengesellschaftInventors: Karl-Rudolf Gassen, Dietmar Bielefeldt, Albrecht Marhold, Hans-Helmut Schwarz
-
Patent number: 5159126Abstract: 1-Chloro-1,1-difluoroethane is prepared by reacting hydrogen fluoride with vinylidene chloride, in a liquid medium containing preferably at least 40 mol % 1,1-dichloro-1-fluoroethane.Type: GrantFiled: December 4, 1990Date of Patent: October 27, 1992Assignee: Solvay S.A.Inventors: Rene Walraevens, James Franklin, Jean-Marie Yernaux
-
Patent number: 5157172Abstract: The invention relates to a process for the preparation of 1,1,1-trifluoro-2-chloroethane from trichloroethene and hydrogen fluoride in the gas phase. In this process a catalyst containing chromium and magnesium is used, which catalyst is obtainable by precipitating chromium(III) hydroxide by reacting 1 mole of a water-soluble chromium(III) salt with at least 1.5 mol of magnesium hydroxide or magnesium oxide in the presence of water, converting the reaction mixture into a paste containing chromium hydroxide and a magnesium salt and then drying the paste and treating it at temperatures of 20.degree. to 500.degree. C. with hydrogen fluoride.Type: GrantFiled: March 2, 1992Date of Patent: October 20, 1992Assignee: Hoechst AktiengesellschaftInventors: Wolfgang Wanzke, Gunter Siegemund, Thomas Muller
-
Catalyst for the manufacture of chlorofluorocarbons, hydrochlorofluorocarbons and hydrofluorocarbons
Patent number: 5155082Abstract: The invention relates to a novel catalyst and process for producing various chlorofluorocarbons, hydrochlorofluorocarbons and hydrofluorocarbons said catalyst prepared by co-extruding aluminum/chromium oxide and optionally impregnating the aluminum/chromium oxide support with a metal salt. The chlorofluorocarbons, hydrochlorofluorocarbons and hydrofluorocarbons, i.e., e.g., 1,1-dichloro-2,2,2-trifluoroethane, produced using the catalyst of the invention are useful in a variety of industrial applications including blowing agent, refrigerant, sterilant gas and solvent applications.Type: GrantFiled: April 12, 1991Date of Patent: October 13, 1992Assignee: Allied-Signal Inc.Inventors: Hsueh S. Tung, Addison M. Smith -
Patent number: 5105033Abstract: A manufacturing process is disclosed for preparing 1,1-dichloro-1-fluorethane by the addition of hydrogen fluoride to 1,1-dichloroethylene in the presence of a hydrofluorination catalyst providing 1,1-dichloro-1-fluoroethane in high yields and reduced 1,1-dichloroethylene content.Additionally, a process is disclosed for reducing the 1,1-dichloroethylene content of a mixture of 1,1-dichloroethylene and 1,1-dichloro-1-fluoroethane.Type: GrantFiled: July 31, 1991Date of Patent: April 14, 1992Assignee: E. I. Du Pont de Nemours and CompanyInventors: Steven H. Swearingen, John F. Wehner, Marlin G. Ridley
-
Patent number: 5091601Abstract: A process for preparing 1,1,1-trifluoro-2,2-dichloroethane by hydrofluorination, in the gas phase, of perchloroethylene in the presence of a catalyst comprising chrome oxides supported on AlF.sub.3 in the gamma and/or beta form.Type: GrantFiled: September 19, 1990Date of Patent: February 25, 1992Assignee: Austimont S.p.A.Inventors: Diego Carmello, Giorgio Guglielmo
-
Patent number: 5068472Abstract: The present invention relates to multistep syntheses of hexafluoropropylene from hexachloropropylene. In all these syntheses the first step is a fluorination of the starting material; later steps convert the initial products to CF.sub.3 --CFCl--CF.sub.3, which is dehalogenated to the desired product.Type: GrantFiled: December 19, 1989Date of Patent: November 26, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventors: James L. Webster, Swiatoslaw Trofimenko, Paul R. Resnick, Douglas W. Bruhnke, Jan J. Lerou, William H. Manogue, Leo E. Manzer, Elrey L. McCann, Steven H. Swearingen, James A. Trainham, Cristobal Bonifaz
-
Patent number: 5057634Abstract: The present invention relates to multistep syntheses of hexafluoropropylene from acyclic three-carbon hydrocarbons or partially halogenated acyclic three-carbon hydrocarbons. In all these syntheses the first step is a vapor-phase chlorofluorination of the starting material to one or more saturated chlorofluorocarbons. Novel catalysts are also provided.Type: GrantFiled: December 19, 1989Date of Patent: October 15, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventors: James L. Webster, Elrey L. McCann, Douglas W. Bruhnke, Jan J. Lerou, William H. Manogue, Leo E. Manzer, Steven H. Swearingen, Swiatoslaw Trofimenko, Cristobal Bonifaz
-
Patent number: 5051537Abstract: An improved process is disclosed for the manufacture of 1,1,1,2-tetrafluoroethane, more particularly, a gas-phase reaction of 1,1,1-trifluorochloroethane with hydrogen fluoride in the presence of a catalyst, a selected metal on aluminum fluoride, and molecular oxygen which process minimizes the oxidation of liberated hydrogen chloride to chlorine and water, extends catalyst life and improves yield.Type: GrantFiled: May 4, 1990Date of Patent: September 24, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventor: Leo E. Manzer
-
Patent number: 5051538Abstract: An improved process for preparing 1,1-dichloro-1-fluoroethane by hydrogen fluoride addition, in the vapor phase, to 1,1-dichloroethylene in the presence of an aluminum fluoride catalyst.Type: GrantFiled: November 20, 1989Date of Patent: September 24, 1991Assignee: E. I. DuPont de Nemours and CompanyInventor: William H. Gumprecht
-
Patent number: 5043491Abstract: The present invention relates to multistep syntheses of hexafluoropropylene from propane, propylene or partially halogenated acyclic three-carbon hydrocarbons. In all these syntheses the first step is a vapor-phase chlorofluorination of the starting material to the unsaturated chlorofluorocarbon CF.sub.3 CClCCl.sub.2.Type: GrantFiled: December 19, 1989Date of Patent: August 27, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventors: James L. Webster, Elrey L. McCann, Douglas W. Bruhnke, Jan J. Lerou, Leo E. Manzer, William H. Manogue, Paul R. Resnick, Swiatoslaw Trofimenko
-
Patent number: 5026930Abstract: An improved gas-phase process for the manufacture of 1,1-difluoro-1,2-dichloroethane and/or 1-fluoro-1,1,2-trichloroethane by contacting a suitable trihaloethylene and/or a tetrahaloethane with hydrogen fluoride in the presence of a metal in combination with a high fluorine content aluminum-containing compound, the reaction being preferably conducted under controlled conditions whereby the production of 1,1,1-trifluorochloroethane is minimized.Type: GrantFiled: January 16, 1990Date of Patent: June 25, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventors: Leo E. Manzer, V. N. Mallikarjuna Rao
-
Patent number: 5015791Abstract: Process for the preparation of fluorinated alkanes by contacting alkenes with HF in the presence of TaCl.sub.2 or TaBr.sub.5.Type: GrantFiled: August 22, 1990Date of Patent: May 14, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventor: V. N. Mallikarjuna Rao
-
Patent number: 5008474Abstract: 1-Chloro-1,1-difluoroethane is prepared by reacting hydrogen fluoride with vinylidene chloride, in a liquid medium containing preferably at least 40 mol % 1,1-dichloro-1-fluoroethane.Type: GrantFiled: March 9, 1990Date of Patent: April 16, 1991Assignee: Solvay & CieInventors: Rene Wairaevens, James Franklin, Jean-Marie Yernaux
-
Patent number: H1129Abstract: An improved process is disclosed for the manufacture of 1,1,1,2-tetrafluoroethane by the vapor-phase reaction of 2-chloro-1,1,1-trifluoroethane with hydrogen fluoride in the presence of an inorganic chromium (III) catalyst which includes co-feeding molecular chlorine to extend catalyst activity.Type: GrantFiled: February 24, 1989Date of Patent: January 5, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: William H. Gumprecht