Acyclic Patents (Class 570/134)
  • Patent number: 5146016
    Abstract: 2H-heptafluoropropane (HFC 227) is used as filler in sensor systems of temperature-sensitive displacement pickups.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: September 8, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ewald Preisegger, Wolfgang Scholten, Thomas Muller
  • Patent number: 5146015
    Abstract: The present invention provides a class of hydrochlorofluorocarbons having a tertiary structure, 5 carbon atoms, 1 chlorine atom, 6 to 8 fluorine atoms, and OH rate constants from about 8 to about 15 cm.sup.3 /molecule/sec.times.10.sup.-14. The hydrochlorofluorocarbons are useful as solvents and blowing agents.
    Type: Grant
    Filed: September 27, 1991
    Date of Patent: September 8, 1992
    Assignee: Allied-Signal Inc.
    Inventor: Chen C. Li
  • Patent number: 5118887
    Abstract: A partially fluorinated alumina catalyst having a determined component, which is obtained by calcining an Al.sub.2 O.sub.3.nH.sub.2 O(n=0 to 3) containing fibril of polytetrafluoroethylene, provides an excellent catalyst for the isomerization of HCFCs.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: June 2, 1992
    Assignee: DuPont-Mitsui Fluorochemicals Co., Ltd.
    Inventors: Susumu Okazaki, Masatsune Ogura, Yasunobu Mochizuki
  • Patent number: 5114544
    Abstract: A process for the production of a fluorocarbon by reducing a fluorocarbon which contains at least one atom of chlorine and/a bromine, in which the reduction is effected in the presence of a redox couple. The redox couple, which is oxidized in the process, may be reduced electrolytically for re-use in the process. A preferred redox couple is a chromous-chromic couple.
    Type: Grant
    Filed: January 23, 1991
    Date of Patent: May 19, 1992
    Assignee: Imperial Chemical Industries PLC
    Inventors: Steven R. Forsyth, Brian T. Grady
  • Patent number: 5105034
    Abstract: The present invention relates to new perfluoroalkyl halides and to their preparation by a process based on the thermodecomposition of perfluorocarbides in the presence of Cl.sub.2, Br.sub.2 and I.sub.2.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: April 14, 1992
    Assignee: Ausimont S.r.l.
    Inventors: Claudio Tonelli, Vito Tortelli
  • Patent number: 5102469
    Abstract: Compositions are described based on hydrogen-containing fluorochlorohydrocarbons selected from the dichloropentafluoropropanes which contain defined amounts of specific surface-active substances selected from the group consisting of straight-chain alkylamines having 9 to 12 carbon atoms, straight chain carboxylic acids having 9 to 12 carbons atoms, branched alkylamines having 8 to 12 carbon atoms, branched carboxylic acids having 8 to 12 carbon atoms, alkyl phosphates, aryl phosphates, mixed alkyl/aryl phosphates, salts of the foregoing alkylamines with the foregoing carboxylic acids, and salts of straight-chain or branched C8- to C12-alkylamines with alkyl, aryl or mixed alkyl/aryl mono- or diesters of phosphoric acid. A process for using these compositions to remove water from surfaces of a wide variety of articles and from a wide variety of materials is also described.
    Type: Grant
    Filed: February 27, 1991
    Date of Patent: April 7, 1992
    Assignee: Kali-Chemie AG
    Inventors: Hans Buchwald, Andreas Brackmann, Boleslaus Raszkowski
  • Patent number: 5100572
    Abstract: An azeotropic mixture of polyfluoropentanes and methanol is disclosed. The azeotropic mixture is useful as: a cleaning agent, a blowing agent, a refrigerant, an aerosol propellant, a heat transfer medium and a power cycle working fluid.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: March 31, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Abid N. Merchant
  • Patent number: 5093432
    Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.
    Type: Grant
    Filed: September 28, 1989
    Date of Patent: March 3, 1992
    Assignee: Exfluor Research Corporation
    Inventors: Thomas R. Bierschenk, Timothy Juhlke, Hajimu Kawa, Richard J. Lagow
  • Patent number: 5087765
    Abstract: In the process for preparing chlorotrifluoroethylene telomers by reaction of chlorotrifluoroethylene with CF.sub.3 CF or R.sub.x --CF.sub.2 OF (wherein R.sub.x may be also a perfluoroalkyl radical having 1 to 10 carbon atoms), the content of telomers with end groups --F is increased or mixtures of telomers containing species with end groups --Cl are obtained by adding F.sub.2, according to particular modalities, to the reaction medium.
    Type: Grant
    Filed: January 11, 1990
    Date of Patent: February 11, 1992
    Assignee: Ausimont S.r.L.
    Inventors: Antonio Marraccini, Antonio Pasquale, Marco Vincenti
  • Patent number: 5087777
    Abstract: Novel partially fluorinated alkenes having the Formula: ##STR1## wherein each R is the same or different and is selected from the group consisting of CF.sub.3, CHF.sub.2, CH.sub.2 F, and CH.sub.3 CF.sub.2, and R' is an alkenyl or fluoroalkenyl group having 1 to 6 carbon atoms have utility as solvents in a variety of industrial cleaning applications including cold cleaning, dry cleaning, and defluxing of printed circuit boards.
    Type: Grant
    Filed: December 4, 1990
    Date of Patent: February 11, 1992
    Assignee: Allied-Signal Inc.
    Inventors: Chien C. Li, Kane D. Cook, Rajat S. Basu
  • Patent number: 5087776
    Abstract: The present invention relates to branched perfluoroalkanes which, having bonds between a quaternary carbon atom and a tertiary carbon atom, easily undergo a homolytic scission of the C--C bond thereby releasing (non-persistent) radicals which may be used as initiators of polymerization of ethylenically unsaturated monomers.A further object of the present invention are new perfluoroalkanes having at least 9 carbon atoms belonging to the above described group.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: February 11, 1992
    Assignee: Ausimont, S.p.A.
    Inventors: Claudio Tonelli, Vito Tortelli
  • Patent number: 5068470
    Abstract: The present invention relates to the synthesis of new terminal olefins, perfluoro 2,4-dimethyl 3-ethylpentene and perfluoro 2-isopropyl 3,3-dimethylbutene, and to the subsequent fluorination thereof in order to obtain highly branched perfluoroalkanes, capable of providing perfluoroalkyl radicals, which are utilizable as initiators for the polymerization of ethylenically unsaturated monomers.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: November 26, 1991
    Assignee: Ausimont, S.r.l
    Inventors: Claudio Tonelli, Vito Tortelli
  • Patent number: 5059728
    Abstract: Novel partially fluorinated alkanes having the Formula: ##STR1## wherein each R is the same or different and is selected from the group consisting of CF.sub.3, CHF.sub.2, CH.sub.2 F, and CH.sub.3 CF.sub.2, and R' is an alkyl or fluoroalkyl group having 1 to 6 carbon atoms with the proviso that when each R is CF.sub.3, R' is not CF.sub.3 (CF.sub.2).sub.2 -, CH.sub.3 CF.sub.2 -, or CF.sub.3 have utility as solvents in a variety of industrial cleaning applications including cold cleaning, dry cleaning, and defluxing of printed circuit boards.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: October 22, 1991
    Assignee: Allied-Signal Inc.
    Inventors: Chien C. Li, Bernard Sukornick
  • Patent number: 5026928
    Abstract: The present invention relates to the synthesis of new terminal olefins, perfluoro 2,4-dimethyl 3-ethylpentene and perfluoro 2-isopropyl 3,3-dimethylbutene, and to the subsequent fluorination thereof in order to obtain highly branched perfluoroalkanes, capable of providing perfluoroalkyl radicals, which are utilizable as initiators for the polymerization of ethylenically unsaturated monomers.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: June 25, 1991
    Assignee: Ausimont S.r.l.
    Inventors: Claudio Tonelli, Vito Tortelli
  • Patent number: 5013472
    Abstract: New chlorotrifluoroethylene telomers and process for preparing them. Chlorotrifluoroethylene is reacted, at a temperature ranging from -100.degree. to +40.degree. C., with a fluoroxy compound of formula R.sub.x --CF.sub.2 OF, wherein R.sub.x represents among others a perhalogenated alkyl radical containing from 1 to 10 carbon atoms. There are obtained telomer mixtures having, among others, the following formulae: R.sub.x --CF.sub.2 --O--(M).sub.n --F; R.sub.x --CF.sub.2 --O--(M).sub.n --O--CF.sub.2 --R.sub.x ; R.sub.x --(M).sub.n --F; R.sub.x (M).sub.n --R.sub.x ; R.sub.x --CF.sub.2 --O--(M).sub.n --R.sub.x and F--(M).sub.n --F; wherein M is CF.sub.2 --CFCL and "N" ranges from 2 to 20. Most of these telomers are new compounds.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: May 7, 1991
    Assignee: Ausimont S.R.L.
    Inventors: Antonio Marraccini, Gabriele Perego, Giovanni Guastalla
  • Patent number: 4983780
    Abstract: The present invention relates to new perfluoroalkyl halides and to their preparation by a process based on the thermodecomposition of perfluorocarbides in the presence of Cl.sub.2, Br.sub.2 and I.sub.2.
    Type: Grant
    Filed: September 19, 1989
    Date of Patent: January 8, 1991
    Assignee: Ausimont S.r.l.
    Inventors: Claudio Tonelli, Vito Tortelli
  • Patent number: 4980324
    Abstract: This invention provides a process for the regeneration and/or activation of a noble catalyst comprising contacting said catalyst with an atmosphere comprising a fluorohalocarbon and/or a fluorohydrocarbon of the formula, C.sub.n H.sub.m F.sub.p X.sub.q, wherein X is chlorine and/or bromine; n is an integer from 1 to 6; m is an integer from 0 to 6, provided that m can be no more than the total n in the compound; p and q are integers from 1-13 when the compound is acrylic and integers from 1-11 when the compound is cyclic, provided that the fluorohalocarbon and/or fluorohalohydrocarbon always contain at least one chlorine or bromine atom and provided that m+p+q=2n+2 when the compound is acrylic and that m+p+q=2n when the compound is cyclic, at a temperature in excess of 200.degree. C.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: December 25, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Carl S. Kellner, Jan J. Lerou, V. N. M. Rao, Klaws G. Wuttke
  • Patent number: 4954666
    Abstract: This invention relates to a process for preparing fluorinated C.sub.4 to C.sub.6 hydrocarbons by catalytically hydrogenating, in the presence of a base, at least partially halogenated olefins. This invention also relates to certain novel cyclic fluorinated C.sub.5 and C.sub.6 hydrocarbons prepared by the process of this invention. This invention further relates to the use of fluorinated C.sub.4 to C.sub.6 hydrocarbons as propellant gas or as working fluid for heat pump systems.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: September 4, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dietmar Bielefeldt, Albrecht Marhold, Michael Negele
  • Patent number: 4937398
    Abstract: The present invention provides a process for the preparation of luorinated alkanes. The process comprises the step of: reacting an alkene with carbon having fluorine absorbed therein at a temperature and for a time sufficient to form fluorinated alkanes. The alkene used is not perhalogenated at the double-bonded carbons. Preferably, the alkene used is vinylidene fluoride or ethylene.The process produces products such as 1,1,1,2-tetrafluoroethane (known in the art as 134a) which may be used as a refrigerant and 1,1,1-trifluoroethane (known in the art as R143a) and 1,2-difluoroethane (known in the art as R152) which may be used as blowing agents or solvents.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: June 26, 1990
    Assignee: Allied-Signal Inc.
    Inventors: Hsueh S. Tung, Richard E. Eibeck, Bernard Sukornick
  • Patent number: 4906796
    Abstract: R-1122 (2-chloro-1,1-difluoro-ethylene) can be substantially removed from a stream of R-134a over a zeolite or carbon molecular sieve having a mean pore size of about 3.8 to 4.8 Angstroms. Preferred are 5A synthetic zeolites or calcium chabazite.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: March 6, 1990
    Assignee: Allied Signal Inc.
    Inventor: Stephen F. Yates
  • Patent number: 4801763
    Abstract: A process is disclosed for purifying and stabilizing a mixture of regular chlorotrifluoroethyelne telomers of formula RCXCl(CF.sub.2 CFCl).sub.n Br from bromine-containing irregular telomer impurities of similar molecular weight. The telomer mixture is produced by reacting chlorotrifluoroethylene with a telogen of formula RCXClBr, where R is CF.sub.2 Br, or Cl, and X is Cl or F. The telomer mixture is then chlorinated using either elevated temperature alone (100.degree. C.-350.degree. C.), or a combination of elevated temperatures (100.degree. C.-200.degree. C.) and light energy primarily of the wavelength region greater than about 3000.degree.A. Under these conditions, CFClBr telomer end group of the regular or normal telomer is chlorinated to form --CFCl.sub.2 end groups, while the bromine-containing irregular telomer impurities (whose bromine-containing end groups are substantially only --CF.sub.2 Br) are substantially not chlorinated.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: January 31, 1989
    Assignee: Occidental Chemical Corporation
    Inventors: James J. Maul, Bobby F. Dannels, David Y. Tang
  • Patent number: 4792643
    Abstract: A novel catalyst is prepared by codepositing hexavalent chromium oxide and a transition metal compound, preferably titanium trichloride, on alumina, followed by fluorinating the resulting combination. The catalyst is useful in the fluorination of a haloethylene of the formula CX.sub.2 .dbd.CHX (where the X's are chlorine or bromine or a combination of the two) in the vapor phase to form 1,1,1,2-tetrafluoroethane.
    Type: Grant
    Filed: June 16, 1987
    Date of Patent: December 20, 1988
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: Igor Sobolev
  • Patent number: 4780559
    Abstract: A method for the preparation of organic fluorides which comprises reacting a quaternary phosphonium fluoride or bifluoride with an organic substrate having at least one atom or group capable of being replaced by a fluorine atom.
    Type: Grant
    Filed: January 1, 1986
    Date of Patent: October 25, 1988
    Assignee: Imperial Chemical Industries PLC
    Inventors: Stephen J. Brown, James H. Clark
  • Patent number: 4770797
    Abstract: The application of carbon fluoride chloride in dry lubricant compositions is disclosed. The material offers a substantial improvement in lubricating properties over prior art carbon fluoride dry lubricants.The improved lubricant is comprised of carbon fluoride chloride of the general formula (C.sub.y F.sub.x Cl.sub.z).sub.n wherein y is 1 or 2, x is greater than 0 to 1.2, z is 0.1 and n defines an infinitely large two dimensional array of repeating units occurring in this molecule of high molecular weight. The resulting lubricant has improved lubricating properties over graphite, MoS.sub.2 and carbon monofluoride.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: September 13, 1988
    Assignee: Allied-Signal Inc.
    Inventors: Allan V. Syracuse, Lynn E. McCurry, David Nalewajek
  • Patent number: 4760208
    Abstract: A process for coupling two low molecular weight telomers of chlorotrifluoroethylene comprises reacting the telomers in a solvent with an amount of iron sufficient to form a coupled olefin. The olefin can then be fluorinated using a suitable fluorinating agent, such as chlorine trifluoride, to form a saturated product. Preferably, the solvent for the coupling reaction is acetonitrile, and the reaction is conducted under reflux conditions. A small amount of FeCl.sub.2 can optionally be added to the reaction mixture as an initiator for the reaction.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: July 26, 1988
    Assignee: Occidental Chemical Corporation
    Inventor: Mohan S. Saran
  • Patent number: 4754085
    Abstract: Process for the preparation of hydro(halo)fluoroalkanes by direct fluorination in liquid phase with elemental fluorine at low temperature (under 0.degree. C.) of the corresponding hydro(halo)=alkenes.
    Type: Grant
    Filed: October 20, 1986
    Date of Patent: June 28, 1988
    Assignee: Ausimont S.p.A.
    Inventors: Claudio Gervasutti, Lino Conte, Gian Paolo Gambaretto
  • Patent number: 4748284
    Abstract: A process for preparing 1,1-dihalo-1,2,2,2-tetrafluoroethanes by isomerization of 1,2-dihalotetrafluoroethanes at their reflux temperature, by using, as a catalyst, the reaction product prepared "in situ" from an anhydrous aluminum halide with at least equimolecular amounts of the isomer, 1,1-dihalo-1,2,2,2-tetrafluoroethane in a medium consisting of 1,2-dihalotetrafluoroethane. The products find application as intermediates for pyrethroid insecticides.
    Type: Grant
    Filed: December 19, 1986
    Date of Patent: May 31, 1988
    Assignee: Montedison S.p.A.
    Inventors: Franco Gozzo, Nicola Troiani, Paolo Piccardi
  • Patent number: 4740640
    Abstract: Novel perchlorofluorinated hydrocarbons of the general formula:Cl-(CFX-CF.sub.2).sub.m -CCl.sub.2 -(CF.sub.2 -CFY).sub.n -Clwherein X and Y represent chlorine or fluorine atoms, and m and n are integers from 1 to 5, together with a process for preparing such perchlorofluorocarbons by reacting chlorotrifluoroethylene or tetrafluoroethylene with carbon tetrachloride or a telomer having the formula Cl.sub.3 C-(CF.sub.2 -CFX).sub.m -Cl in a polar solvent at a temperature of at least 120.degree. C. in the presence of copper or a copper salt.
    Type: Grant
    Filed: October 30, 1985
    Date of Patent: April 26, 1988
    Assignee: Atochem
    Inventors: Bernard Boutevin, Yves Hervaud
  • Patent number: 4647391
    Abstract: Working fluid/solvent compositions for use in absorption heating and cooling equipment, which compositions comprise a chlorofluoroethane with a boiling point between -40.degree. and +50.degree. C. and at least one solvent with a boiling point above 100.degree. C., the solvent being at least one material having the formula:C.sub.m Cl.sub.2m+1 --(CF.sub.2 --CFCl).sub.n --Xwherein m is zero or one, n is an integer from one to four, and is at least two when m is zero, and X is hydrogen or chlorine, X being hydrogen only when m is one.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: March 3, 1987
    Assignee: Atochem
    Inventors: Rene Bertocchio, Andre Gagnieur, Henri Mathias
  • Patent number: 4626608
    Abstract: Novel persistent perfluorinated free radicals are disclosed, which upon thermal decomposition yield free radicals which can be used to polymerize polymerizable monomers containing ethylenic unsaturation.
    Type: Grant
    Filed: April 5, 1983
    Date of Patent: December 2, 1986
    Assignee: Green Cross Corporation
    Inventors: Kirby V. Scherer, Jr., Taizo Ono, Kouichi Yamanouchi
  • Patent number: 4570043
    Abstract: Dielectric, cooling or arc-extinguishing fluids comprise a mixture of tetrachlorodifluoroethane and perchloroethylene, optionally with incorporation of a third component which is preferably trichlorotrifluoroethane. Transformer and circuit-interrupter apparatus containing such dielectric fluids are also described.
    Type: Grant
    Filed: May 31, 1983
    Date of Patent: February 11, 1986
    Assignee: The Electricity Council
    Inventors: Harold Lloyd, David S. L. Slinn
  • Patent number: 4559154
    Abstract: An absorption heat pump system wherein the working fluid is a saturated fluorohydrocarbon or fluorohydrocarbon ether having from 3 to 5 carbon atoms.
    Type: Grant
    Filed: July 31, 1984
    Date of Patent: December 17, 1985
    Assignee: Imperial Chemical Industries PLC
    Inventor: Richard L. Powell
  • Patent number: 4541943
    Abstract: A mechanical vapor recompression heat pump system wherein the working fluid is a saturated fluorohydrocarbon or fluorohydrocarbon ether having from 3 to 5 carbon atoms or a fluorinated amine containing up to 6 carbon atoms and having the formula: ##STR1## wherein each of X and X.sup.1, independently, represents hydrogen or fluorine,R represents hydrogen or a lower alkyl radical,n represents an integer from 1 to 4,each of m and q represents an integer from 0 to 2,p represents an integer from 0 to 4 provided thatp is not zero when X.sup.1 is fluorine, andr represents an integer from 1 to 3;or the formula: ##STR2## wherein W represents hydrogen or fluorine, a represents an integer from 3 to 5, b represents an integer from 1 to 3 and c represents an integer from 0 to 2 provided that c is not zero when W is fluorine.
    Type: Grant
    Filed: May 16, 1984
    Date of Patent: September 17, 1985
    Assignee: Imperial Chemical Industries PLC
    Inventor: Richard L. Powell
  • Patent number: 4479901
    Abstract: Process for fluorinating an organic carbanion, which process comprises contacting and reacting, in a dry inert atmosphere, the compound of the formula selected from ##STR1## wherein ##STR2## is the carbanion, M is a counter ion, and X is a halide and a selected N-flouro-N-alkylsulfonamide.
    Type: Grant
    Filed: August 15, 1983
    Date of Patent: October 30, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William E. Barnette
  • Patent number: 4465609
    Abstract: A method of operating a heat pump or a thermal engine with the vaporization and the condensation of a heat transfer fluid. The fluid is a chlorofluorinated hydrocarbon with 2 or 3 carbon atoms, a hydrogen atom, at least one chlorine atom per molecule and at most one chlorine atom per carbon atom, with the remainder consisting of fluorine, and said fluid having a critical temperature of at least 140.degree. C.
    Type: Grant
    Filed: August 11, 1982
    Date of Patent: August 14, 1984
    Assignee: Institut Francais du Petrole
    Inventors: Jacques Denis, Jerome Weill, Alexandre Rojey
  • Patent number: 4446068
    Abstract: N-substituted fluoroaziridines useful as chemical intermediates and process or making by reaction of fluoroazines with fluorocarbenes.
    Type: Grant
    Filed: April 4, 1967
    Date of Patent: May 1, 1984
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Ronald A. Mitsch
  • Patent number: 4401871
    Abstract: A liquid halogenated hydrogenated hydrocarbon composition suitable for use as a dielectric and/or arc-extinguishing fluid in electrical apparatus, which comprises(a) a major proportion by weight of one or more halogenated paraffinic hydrocarbons having at least 8 carbon atoms and containing from 40% to 70% by weight of halogn based on the halogenated paraffinic hydrocarbon, and(b) a minor proportion by weight of at least one non-flammable viscosity-reducing additive for the halogenated paraffinic hydrocarbon (a) which contains at least 50% by weight of halogen based on the additive and is a halogenated aliphatic hydrocarbon containing from 2 to 6 carbon atoms.Suitable electrical apparatus may comprise a circuit interruption device such as a switchgear.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: August 30, 1983
    Assignee: Imperial Chemical Industries PLC
    Inventors: Harold Lloyd, John Coxon
  • Patent number: 4359371
    Abstract: A process for brominating fluorine-containing halogenated hydrocarbons is disclosed which comprises the step of reacting at least one halogenated fluorohydrocarbon compound of formula (I) ##STR1## wherein R.sub.1 represents hydrogen, fluorine, chlorine, bromine or a lower alkyl group which is perhalogenated by a halogen selected from the group consisting of fluorine, chlorine and bromine;R.sub.2 represents hydrogen, fluorine, chlorine, or bromine, and;R.sub.3 represents fluorine or perfluorinated lower alkyl, in gaseous form with bromine under irradiation with light having a wavelength from about 250 nm to about 600 nm in the presence of an active amount of chlorine not exceeding about 2 moles per mole of bromine at a reaction temperature not exceeding 300.degree. C., which is sufficient for transforming the reactants into sufficiently stable gaseous compounds and for substituting the hydrogen in a compound of formula (I) by bromine to form a compound of formula (II) ##STR2## wherein R.sub.1, R.sub.2 and R.
    Type: Grant
    Filed: December 1, 1980
    Date of Patent: November 16, 1982
    Assignee: Kali-Chemie AG
    Inventors: Horst Bohm, Werner Rudolph, Joachim Massonne
  • Patent number: 4330475
    Abstract: A method and apparatus for improving direct fluorinations are disclosed in which the material to be fluorinated is formed into an aerosol prior to fluorination.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: May 18, 1982
    Inventors: James L. Adcock, Ehrengard B. Renk
  • Patent number: 4324930
    Abstract: The compound 2,3-dichloro-2-trifluoromethyl-1,1,1,3,4,4,5,5,5-nonafluoropentane is obtained by chlorinating perfluoro(2-methyl-2-pentene) with elementary chlorine in the presence of light rich in energy. This compound is distinguished by a high thermal and chemical stability.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: April 13, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Sigmar-Peter von Halasz
  • Patent number: 4319060
    Abstract: The present invention provides a novel process for producing 1,2-dichloro-1,1,2,2-tetrafluoroethane substantially free of the 1,1-isomer. The process includes contacting, in the vapor phase, an organic feed composition containing a major amount of the 1,2-isomer and a minor amount of 1,1-isomer with hydrogen in the presence of a hydrodechlorination catalyst. The process selectively degrades the 1,1-isomer. Also provided is a process for producing high purity 1,2-isomer.
    Type: Grant
    Filed: December 8, 1980
    Date of Patent: March 9, 1982
    Assignee: Allied Chemical Corporation
    Inventors: William J. Cunningham, Addison M. Smith, Robert A. Wiles
  • Patent number: 4281119
    Abstract: An apparatus and process useful in direct fluorination of a variety of compositions, as well as the fluorinated compositions themselves, are disclosed.The apparatus comprises a cryogenic zone reactor, such as a packed column reactor, suitably divided into a plurality of independently controllable cryogenic temperature zones. Means are also provided to introduce a reactant to be fluorinated as well as to introduce a mixture of fluorine gas and an inert gas.New fluorinated compounds are also disclosed. These include: perfluoro-2-methoxyethyl ether; perfluoro-1,4-dioxane; perfluoro-2,5-diketohexane; perfluorohexamethylethane; and monohydropentadecafluoroadamantane.Additionally, new syntheses for trifluoroacetic acid, a commercially significant bulk chemical, are disclosed. One synthesis comprises producing perfluoroethyl acetate by direct fluorination using a cryogenic zone reactor, followed by hydrolysis of perfluoroethyl acetate. Two moles of the acid are produced for each mole of ester.
    Type: Grant
    Filed: June 23, 1976
    Date of Patent: July 28, 1981
    Assignee: Massachusetts Institute of Technology
    Inventors: Richard J. Lagow, James L. Adcock, Norma J. Maraschin
  • Patent number: 4228107
    Abstract: Polyhalogenated hydrocarbons of general formula RR.sup.1 CH--CHX--CH.sub.2 CYZQ wherein R is hydrogen or lower alkyl, R.sup.1 is lower alkyl, X is Cl, Br or I, Y is F, Cl or Br, Z is Y or Q and Q is a group W(CF.sub.2).sub.m --in which W is hydrogen, F or Cl and m is 1 or 2, provided that X is always Br or I when at least one of Y and Z is Br, and a process for preparing these polyhalogenated hydrocarbons by reacting an alkyl-substituted butene with a polyhalogenated alkane having from 2 to 4 carbon atoms, in the presence of a catalyst.
    Type: Grant
    Filed: May 17, 1979
    Date of Patent: October 14, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: David Holland, David J. Milner, Roger K. Huff