Acyclic Patents (Class 570/134)
  • Patent number: 5763701
    Abstract: The invention relates to a process for preparing pentafluoroethane (R 125) by reacting perchloroethylene with hydrogen fluoride in the gas phase over a chromium-containing catalyst, wherein the catalyst used comprises chromium and magnesium and is obtainable by reacting a water-soluble chromium(III) salt with magnesium hydroxide or magnesium oxide and, if desired, graphite in the presence of water, converting the reaction mixture into a paste, then drying the paste and treating it with hydrogen fluoride at temperatures of from 20.degree. to 500.degree. C., using such amounts of chromium(III) and magnesium salts and, if desired, graphite that the dried paste before treatment with hydrogen fluoride contains from 4.5 to 26% by weight of Cr, expressed as Cr.sub.2 O.sub.3, and at least 25% by weight of Mg, expressed as MgO, and, if desired, graphite.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: June 9, 1998
    Assignee: Solvay (Societe Anonyme)
    Inventors: Hans-Matthias Deger, Werner Krause, Dieter Schmid, Martin Hoeveler
  • Patent number: 5760282
    Abstract: A process is disclosed for the manufacture of product compounds of the formula HC(R.sup.1).sub.2 C(R.sup.1).sub.2 C(R.sup.2).sub.2 C(R.sup.2).sub.2 H wherein each R.sup.1 is independently selected from the group consisting of H, F, Cl, CN, R, OR, CO.sub.2 R, C(O)R, OC(O)R, R.sup.f, OR.sup.f, CO.sub.2 R.sup.f C(O)R.sup.f and OC(O)R.sup.f where R is a hydrocarbyl group and R.sup.f is a C.sub.1 to C.sub.10 polyfluoroalkyl group, provided that at least one R.sup.1 is F, and wherein each R.sup.2 is independently selected from the group consisting of H, F, Cl, CN, R, OR, CO.sub.2 R, C(O)R, OC(O)R, R.sup.f, OR.sup.f, CO.sub.2 R.sup.f, C(O)R.sup.f, OC(O)R.sup.f and difunctional linkages where an R.sup.2 group on each of two adjacent carbon atoms together form a link selected from the group consisting of --CH.sub.2 CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 CH(CH.sub.3)--, --CH.sub.2 CH(CH.sub.3)CH.sub.2 --, --C(O)OC(O)--, and norborndiyl.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: June 2, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ralph Thomas Baker, Richard Paul Beatty, William Brown Farnham, Robert Lewis Wallace, Jr.
  • Patent number: 5753776
    Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: May 19, 1998
    Assignee: Exfluor Research Corporation
    Inventors: Thomas R. Bierschenk, Timothy J. Juhlke, Hajimu Kawa, Richard J. Lagow
  • Patent number: 5728884
    Abstract: The invention relates to a process for the work-up of a liquid complex hydrofluoride of a tertiary amine of the formula (I) ?R.sup.1 R.sup.2 R.sup.3 N.multidot.n HF!, where the radicals R.sup.1, R.sup.2 and R.sup.3 are C.sub.1 -C.sub.8 -alkyl groups which together have at least 7 carbon atoms and n is an integer or fractional number where 1.5<n<3, which, for the purpose of molecular addition of HF to a halogenated alkene, is reacted with the latter. In the reaction of the halogenated alkene with the complex amine hydrofluoride of the formula (I), the molar ratio HF:R.sup.1 R.sup.2 R.sup.3 N is allowed to fall until amine separates out as a further liquid phase, and the amine is separated off.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: March 17, 1998
    Assignee: Solvay
    Inventors: Ulrich Hahn, Raimund Franz, Gunter Siegemund
  • Patent number: 5723699
    Abstract: The disclosure relates to removing impurities from hexafluoroethane (CF.sub.3 CF.sub.3), also known as Perfluorocarbon 116 (PFC-116) or Fluorocarbon 116 (FC-116), by using azeotropic distillation such that an overhead product consisting essentially of HCl-hexafluoroethane is formed, optionally combined with a phase separation step to break the HCl-hexafluoroethane azeotropic or azeotrope-like composition thereby permitting recovery of substantially pure hexafluoroethane. Unreacted hydrogen fluoride (HF) may be removed from hexafluoroethane during the above azeotropic distillation with HCl or alternatively by an azeotropic distillation wherein an HF-hexafluoroethane azeotropic or azeotrope-like composition exits overhead and substantially pure HF exits in the bottoms stream.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: March 3, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ralph Newton Miller, Mark Richard Deschere, Barry Asher Mahler, Olagappan Muthu
  • Patent number: 5716541
    Abstract: Azeotropic compositions made up of from about 60 to about 78% by weight of 1,1,1,3,3-pentafluoropropane and from about 22 to about 40% by weight of tetramethylsilane have been found to be particularly useful as blowing agents for the production of polyurethane foams.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: February 10, 1998
    Assignee: Bayer Corporation
    Inventors: Joachim Werner, Scott A. Kane, Charles E. Mortimer, Herman P. Doerge, Eric F. Boonstra
  • Patent number: 5714654
    Abstract: A method is proposed for producing 1,1,1,3,3-pentafluoropropane, in which 1,1,3,3,3-pentafluoropropene is reduced at a temperature between 40.degree. C. and 300.degree. C. by reacting it with hydrogen in a gas phase in the presence of a palladium catalyst. Further, a method is proposed for producing 1,1,1,3,3-pentafluoropropane and/or 1,1,3,3,3-pentafluoropropene, in which the raw material 2-chloro-1,1,3,3,3-pentafluoropropene is hydrogenated especially at a temperature between 30.degree. C. and 450.degree. C. in the presence of a catalyst composed of at least one metal selected from palladium, platinum and rhodium. Further, a method is proposed of producing 1,1,3,3,3-pentafluoropropene, in which 1,1,1,3,3-pentafluoro-2,3-dichloropropane is dechlorinated by using hydrogen in the presence of a metal oxide catalyst. Based on these production methods, 1,1,1,3,3-pentafluoropropane and/or 1,1,3,3,3-pentafluoropropene can thus be produced with high yield rates.
    Type: Grant
    Filed: December 8, 1995
    Date of Patent: February 3, 1998
    Assignee: Daikin Industries Ltd.
    Inventors: Akinori Yamamoto, Eiji Seki, Hirokazu Aoyama, Tatsuo Nakada
  • Patent number: 5705718
    Abstract: To remove the unsaturated impurities (in particular 1-chloro-2,2-difluoroethylene and polyfluoropropenes) present in crude 1,1,1,2-tetrafluoroethane (F134a), a gaseous mixture of crude F134a, of hydrofluoric acid and of chlorine is treated in gaseous phase in the presence of a fluorination catalyst at a temperature of between 100.degree. and 300.degree. C. and at a pressure between atmospheric pressure and 2.5 MPa, the molar ratio HF/F134a being between 0.05 and 0.5 and the molar ratio Cl.sub.2 /F134a between 0.0001 and 0.1.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: January 6, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Bernard Cheminal, Andre Lantz
  • Patent number: 5705716
    Abstract: The present invention provides hydrochlorofluorocarbons having 3 to 5 carbons atoms, 1 to 2 chlorine atoms, and an OH rate constant from about 8 to about 25 cm.sup.3 /molecule/sec.times.10.sup.-14. The hydrochlorofluorocarbons are useful as solvents and blowing agents.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: January 6, 1998
    Assignee: AlliedSignal Inc.
    Inventor: Chien Chi Li
  • Patent number: 5696307
    Abstract: Hydrofluoroalkanes useful as solvents, especially for vapor degreasing and solvent cleaning, are one or many of the following formulae:CHF.sub.2 --X--(CHF).sub.n --X--Ywherein X is selected from the group consisting of CHF, CF.sub.2 and CH.sub.2, Y is CH.sub.3, and n is 0, 1 or 2.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: December 9, 1997
    Assignee: AlliedSignal Inc.
    Inventors: Michael Van Der Puy, Rajat Subhra Basu, David Nalewajek, Lois A. Ellis
  • Patent number: 5681902
    Abstract: Free radical reaction of unsaturated material, dissolved in a polar, water immiscible organic solvent, & perfluoroalkyl iodide in the presence of buffer or means for adjusting pH of aqueous phase.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: October 28, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Donald Douglas May
  • Patent number: 5675046
    Abstract: A process for producing perfluorocarbons which comprises a step of contacting a hydrofluorocarbon with fluorine gas in a vapor phase at an elevated reaction temperature in a first reaction zone to obtain a gaseous reaction mixture; and a step of introducing the gaseous reaction mixture as a diluent gas into a second reaction zone and contacting the same therein at an elevated reaction temperature with a hydrofluorocarbon fed to the second reaction zone if necessary together with fluorine gas, the hydrofluorocarbon fed to the second reaction zone being different from the hydrofluorocarbon reacted in the first reaction zone.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: October 7, 1997
    Assignee: Showa Denko K.K.
    Inventors: Hiromoto Ohno, Tetsuo Nakajo, Tatsuharu Arai, Toshio Ohi
  • Patent number: 5672294
    Abstract: Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and at least one hydrocarbon selected from the group n-pentane, iso-pentane, cyclopentane, n-hexane and iso-hexane are provided. The compositions of the invention are useful in the preparation of polyurethane and polyisocyanurate foams.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: September 30, 1997
    Assignee: AlliedSignal Inc.
    Inventors: Earl August Eugene Lund, deceased, Robert Christian Parker, Ian Robert Shankland
  • Patent number: 5629458
    Abstract: A vapor phase process for producing a fluorinated alcohol, such as 2,2,2-trifluoroethanol via oxidation of an hydrofluorocarbon, such as 1,1,1-trifluoroethane, with an oxidizing agent and elemental fluorine.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: May 13, 1997
    Assignee: AlliedSignal Inc.
    Inventors: Alagappan Thenappan, Michael Van Der Puy, Richard Eibeck
  • Patent number: 5629460
    Abstract: A vapor phase process for the preparation of fluorinated ketones, such as 1,1,1,3,3,3-hexafluoro-2-propanone via oxidation of hydrofluorocarbons, such as 1,1,1,3,3,3-hexafluoropropane, with an oxidizing agent and elemental fluorine at temperatures ranging from 50.degree. C. to 300.degree. C. and residence times ranging from 2 to 60 seconds.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: May 13, 1997
    Assignee: AlliedSignal Inc.
    Inventors: Alagappan Thenappan, Michael Van Der Puv, Richard Eibeck
  • Patent number: 5578278
    Abstract: Direct fluorination of organics such as 1,8-dichlorooctane in tubular reactor. Inert liquid containing organic feed is circulated through tubular reactor with fluorine gas for a time and at a temperature sufficient to yield fluorinated organic. Preferably, liquid and gas phases are separated from reactor product stream containing inert liquid, fluorinated organic, and any unreacted organic is recycled to turbulent mixing zone upstream of reactor in which fresh organic feed is added; and fluorine is added to recycle stream at end of mixing zone. Flow in tubular reactor is turbulent. Rate of organic feed and fluorine addition to process are independent of each other. Among process advantages are: Freon solvents not required; good control of reaction exotherm; and HF scavengers not required. Process useful for partial or complete fluorination.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: November 26, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: David J. Fall, Miguel A. Guerra
  • Patent number: 5571870
    Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: November 5, 1996
    Assignee: Exfluor Research Corporation
    Inventors: Thomas R. Bierschenk, Timothy Juhlke, Hajimu Kawa, Richard J. Lagow
  • Patent number: 5557018
    Abstract: Selected partially fluorinated .alpha.,.omega.-dienes can be (co)polymerized to form polymers in which cyclic structures are present. A novel free radical polymerization process, in which the polymer obtained is dependent on the initiator used, is described. The polymers are useful for films, coatings and molded parts.
    Type: Grant
    Filed: September 13, 1995
    Date of Patent: September 17, 1996
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Bruce E. Smart, Zhen-Yu Yang
  • Patent number: 5557019
    Abstract: A new 3,3-dichloro-1,1,1,2,2,4,4,5,5,5-decafluoropentane as a precursor of alternatives of refrigerants, etc.A method to obtain the target products at high yield and high selectivity by reacting tetrafluoroethylene and difluorodichloromethane under the Lewis acid catalyst to produce the new compound and an economical method in a continuous reaction state.A production method of 1,1,1,2,2,4,4,5,5,5-decafluoropentane at high yield by reducing 3,3-dichloro-1,1,1,2,2,4,4,5,5,5-decafluoropentane.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: September 17, 1996
    Assignee: Daikin Industries Ltd.
    Inventors: Hirokazu Aoyama, Satoru Kohno, Satoshi Koyama
  • Patent number: 5545769
    Abstract: A process is disclosed for the manufacture of product compounds of the formula HC(R.sup.1).sub.2 C(R.sup.1).sub.2 C(R.sup.2).sub.2 H wherein each R.sup.1 is independently selected from the group consisting of H, F, Cl, CN, R, OR, CO.sub.2 R, C(O)R, OC(O)R, R.sup.f, OR.sup.f, CO.sub.2 R.sup.f, C(O)R.sup.f and OC(O)R.sup.f where R is a hydrocarbyl group and R.sup.f is a C.sub.1 to C.sub.10 polyfluoroalkyl group, provided that at least one R.sup.1 is F, and wherein each R.sup.2 is independently selected from the group consisting of H, F, Cl, CN, R, OR, CO.sub.2 R, C(O)R, OC(O)R, R.sup.f, OR.sup.f, CO.sub.2 R.sup.f, C(O)R.sup.f, OC(O)R.sup.f and difunctional linkages where an R.sup.2 group on each of two adjacent carbon atoms together form a link selected from the group consisting of --CH.sub.2 CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 CH(CH.sub.3)--, --CH.sub.2 CH(CH.sub.3)CH.sub.2 --, --C(O)OC(O)--, and norborndiyl.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: August 13, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ralph T. Baker, Richard P. Beatty, William B. Farnham, Robert L. Wallace, Jr.
  • Patent number: 5531916
    Abstract: Cleaning compositions comprising an acyclic aliphatic hydrofluorocarbon represented by the formula:C.sub.x H.sub.y F.sub.2x+2-ywhere x equals 4, 5 or 6, y equals 1, 2 or 3 with the proviso that when x equals 4, Y equals 2 or 3, and a co-solvent boiling between 20.degree. C.-105.degree. C. that are alcohols, esters, ethers, ketones, chlorinated hydrocarbons, optionally containing fluorine, having 1-4 carbons atoms, acetonitrile and nitromethane.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: July 2, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Abid N. Merchant
  • Patent number: 5527975
    Abstract: Bromochloro-alkanes are made by reaction of a corresponding chloroalkene with hydrogen bromide by a continuous process carried at -20.degree. to +20.degree. C., preferably in a gas-lift reactor.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: June 18, 1996
    Assignee: Albemarle Corporation
    Inventors: Dominique Cosserat, Francois Stutz
  • Patent number: 5488142
    Abstract: Direct fiuorination of organics such as 1,8-dichlorooctane in tubular reactor. Inert liquid containing organic feed is circulated through tubular reactor with fluorine gas for a time and at a temperature sufficient to yield fluorinated organic. Preferably, liquid and gas phases are separated from reactor product stream containing inert liquid, fluorinated organic, and any unreacted organic is recycled to turbulent mixing zone upstream of reactor in which fresh organic feed is added; and fluorine is added to recycle stream at end of mixing zone. Flow in tubular reactor is turbulent. Rate of organic feed and fluorine addition to process are independent of each other. Among process advantages are: Freon solvents not required; good control of reaction exotherm; and HF scavengers not required. Process useful for partial or complete fluorination.
    Type: Grant
    Filed: October 4, 1993
    Date of Patent: January 30, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: David J. Fall, Miguel A. Guerra
  • Patent number: 5481050
    Abstract: The invention relates to a cost effective and convenient process for the manufacture of fluorinated olefins of the formula RCF.sub.2 CH=CH.sub.2 where R is C.sub.x Cl.sub.y F.sub.z and y+z=2.times.+1. The invention is also directed to a lo practical process for converting these olefins to hydrofluorocarbons via the catalyzed fluorination with hydrogen fluoride. Hydrofluorocarbons produced via this process have application as solvents among other uses.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: January 2, 1996
    Assignee: AlliedSignal Inc.
    Inventors: Michael Van Der Puy, G. V. Bindu Madhavan, Alagappan Thenappan, Hsueh S. Tung
  • Patent number: 5478486
    Abstract: Antistatic agents and their use in processing textiles or formed plastic substrates. The antistatic agent comprises a compound having a fluorocarbon moiety and an ethoxylated quaternary ammonium moiety. The antistatic composition increases the electrolytic conductivity of treated textile or plastic materials, thereby increasing the rate of electrostatic charge dissipation thereof. The antistatic agents remain effective after exposure of the treated substrate to an aqueous environment.
    Type: Grant
    Filed: November 18, 1993
    Date of Patent: December 26, 1995
    Assignee: Henkel Corporation
    Inventor: Michael J. Incorvia
  • Patent number: 5463149
    Abstract: Disclosed are compounds suitable for use as raw materials which enable cis-olefin compounds useful as physiologically active substances such as the sex pheromones of various insects, or as intermediates for the synthesis thereof to be prepared on an industrial scale at a reasonable cost, and processes for the preparation of cis-olefin compounds by using the same. For this purpose, novel compounds (i.e., 1-halo-cis-3-tetradecenes) of the general formula (I)CH.sub.3 (CH.sub.2).sub.9 CH.dbd.CH(CH.sub.2).sub.2 X (I)wherein X is a halogen atom, are used as raw materials for the preparation of cis-olefin compounds.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: October 31, 1995
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Takehiko Fukumoto, Daisuke Iwai, Shigeo Okano, Hiroshi Suzuki, Mitsuyoshi Oshima
  • Patent number: 5461117
    Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: October 24, 1995
    Assignee: Exfluor Research Corporation
    Inventors: Thomas R. Bierschenk, Timothy J. Juhlke, Hajimu Kawa, Richard J. Lagow
  • Patent number: 5446217
    Abstract: The invention relates to a cost effective and convenient process for the manufacture of fluorinated olefins of the formula RCF.sub.2 CH=CH.sub.2 where R is C.sub.x Cl.sub.y F.sub.z and y+z=2x+1. The invention is also directed to a practical process for converting these olefins to hydrofluorocarbons via the catalyzed fluorination with hydrogen fluoride. Hydrofluorocarbons produced via this process have application as solvents among other uses.
    Type: Grant
    Filed: May 16, 1994
    Date of Patent: August 29, 1995
    Assignee: AlliedSignal Inc.
    Inventors: Michael Van Der Puy, G. V. Bindu Madhavan, Alagappan Thenappan, Hsueh S. Tung
  • Patent number: 5423994
    Abstract: Compounds which can be defined by the formula (I):CF.sub.3 --C.sub.n F.sub.2n --C.sub.m H.sub.2m --CH.sub.3 (I)wherein:n is a numeral comprised within the range of from 1 to 21;m is a numeral comprised within the range of from 3 to 25;n+m is a numeral equal to, or higher than, 18;with the chain of carbon atoms being either linear or branchedare used as agents affording sliding characteristics (ski-waxes) for skis, to be applied onto the ski sole, and/or to be incorporated inside the ski sole.A sliding composition is also disclosed, which contains a paraffinic wax and at least one compound with formula (I).
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: June 13, 1995
    Assignee: Enichem Synthesis S.p.A.
    Inventors: Enrico Traverso, Antonio Rinaldi
  • Patent number: 5421964
    Abstract: The present invention discloses an extractive distillation process for separating HCl from pentafluoroethane, chloropentafluoroethane, chlorotrifluoroethane, trifluoromethane, and other fully saturated and unsaturated fluorocarbons, chlorofluorocarbons and chlorocarbons.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: June 6, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Barry A. Mahler, Vinci M. Felix, Ralph N. Miller
  • Patent number: 5376333
    Abstract: 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: Grant
    Filed: July 28, 1989
    Date of Patent: December 27, 1994
    Assignee: AlliedSignal, Inc.
    Inventors: Ian R. Shankland, David P. Wilson, Rajat S. Basu
  • Patent number: 5354928
    Abstract: The invention relates to a process for the manufacture of 1,1,1,2-tetrafluorochloroethane and of pentafluoroethane.The process which consists of gas phase catalytic fluorination of at least one pentahaloethane of formula C.sub.2 HX.sub.2-n F.sub.3+n in which X denotes a chlorine or bromine atom and n the number 0 or 1, by hydrofluoric acid, is characterized in that a catalyst is employed consisting of a catalytic quantity of chromium in an oxidation state equal to or greater than 3 and of an activated charcoal as support.The selectivity for 1,1,1,2-tetrafluorochloroethane and pentafluoroethane reaches approximately 95% and even more.
    Type: Grant
    Filed: May 24, 1993
    Date of Patent: October 11, 1994
    Assignee: Societe Atochem
    Inventors: Bernard Cheminal, Eric Lacroix, Andre Lantz
  • Patent number: 5352785
    Abstract: A process for the purification of a perfluorochemical composition comprises continuously mixing the perfluorochemical composition, comprising a liquid mixture of inert perfluorochemicals (e.g., perfluoroalkanes, perfluoroethers, perfluoroaminoethers, or perfluoroalkyl tertiary amines) and isomeric fluorohydrochemicals, with a stabilization composition comprising water-miscible alkanol and an aqueous solution of base (such as potassium hydroxide) made by dissolving the base in an amount of water sufficient to dissolve or disperse the fluoride salt by-products of the subsequent reaction of the base with the fluorohydrochemicals to form fluoroolefins, the amount of the alkanol in the stabilization composition being in stoichiometric excess of the amount needed to completely convert the fluoroolefins to alkoxyvinyl ethers. The process can be utilized to purify the product mixtures resulting from fluorination methods such as direct fluorination or ECF.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: October 4, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Thomas C. Herzberg, Robert B. Fletcher, Randall F. Henderson
  • Patent number: 5332790
    Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: July 26, 1994
    Assignee: Exfluor Research Corporation
    Inventors: Thomas R. Bierschenk, Timothy Juhlke, Hajimu Kawa, Richard J. Lagow
  • Patent number: 5322903
    Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.
    Type: Grant
    Filed: January 17, 1992
    Date of Patent: June 21, 1994
    Assignee: Exfluor Research Corporation
    Inventors: Thomas R. Bierschenk, Timothy Juhlke, Hajimu Kawa, Richard J. Lagow
  • Patent number: 5322904
    Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: June 21, 1994
    Assignee: Exfluor Research Corporation
    Inventors: Thomas R. Bierschenk, Timothy J. Juhlke, Hajimu Kawa, Richard J. Lagow
  • Patent number: 5315044
    Abstract: A process for production of 1,1,1-trifluoro-2,2-dichloroethane comprising chlorination of 1,1,1-trifluoro-2-chloroethane with chlorine gas in the presence or absence of a metal salt as a catalyst.
    Type: Grant
    Filed: September 9, 1992
    Date of Patent: May 24, 1994
    Assignee: Daikin Industries Ltd.
    Inventors: Yasuhisa Furutaka, Yukio Homoto, Tsunetoshi Honda
  • Patent number: 5304702
    Abstract: 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: Grant
    Filed: March 13, 1992
    Date of Patent: April 19, 1994
    Assignee: Metallgesellschaft AG
    Inventors: Wilfried Weiss, Klaus Kobele
  • Patent number: 5302764
    Abstract: A difluorinated hydrocarbon compound represented by the general formula (1) is reacted with cobalt trifluoride to give a trifluorinated hydrocarbon compound represented by the general formula (2), wherein R represents lower alkyl and R' and R" represent each hydrogen, halogen or lower alkyl which may be halogenated. The reacton proceeds under mild conditions to yield the objective compound with high selectivity.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: April 12, 1994
    Assignees: Japan as represented by Director General of Agency of Industrial Science & Technology, Nippon Zeon Co., Ltd.
    Inventors: Akira Sekiya, Shigeru Kurosawa, Toshiro Yamada, Kuniaki Goto
  • Patent number: 5274189
    Abstract: This invention relates to a process for producing linear hydrofluorocarbons of the formula XCF.sub.2 (CF.sub.2).sub.n CH.sub.2 F, where X is H or F, and n is 1 to 7 when X is H, and n is 0 to 7 when X is F, by a vapor phase catalytic reaction of HF and phosgene or sulfuryl chloride with corresponding compounds of the formula XCF.sub.2 (CF.sub.2).sub.n CH.sub.2 OZ where Z is H or --C(O)OCH.sub.2 (CF.sub.2).sub.n CF.sub.2 X.
    Type: Grant
    Filed: May 24, 1993
    Date of Patent: December 28, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Mario J. Nappa, Allen C. Sievert
  • Patent number: 5268516
    Abstract: The invention relates to a continuous process for the preparation of perfluoroalkyl iodides containing from 4 to 12 carbon atoms by thermal telomerization of tetrafluoroethylene by pentafluoroethyl iodide or heptafluoroisopropyl iodide in a tubular reactor.According to the invention, 30 to 75% of the tetrafluoroethylene is supplied at the head of the reactor; the remainder is introduced at a point in the reactor located between the 2/5 and 3/4 of the length of the tube.The proportion of undesirable heavy telomers is reduced in this way.
    Type: Grant
    Filed: January 13, 1993
    Date of Patent: December 7, 1993
    Assignee: Elf Atochem S.A.
    Inventors: Rene Bertocchio, Georges Lacote, Christophe Verge
  • Patent number: 5268122
    Abstract: A catalyic process is disclosed for producing fluorine-substituted hydrocarbon products of the formulae RCH.sub.2 CF.sub.2 R and RFC.dbd.CHR at an elevated temperature, from compounds of the formula RCHFCHFR, where each R is independently selected from the group consisting of --CF.sub.3, --CF.sub.2 CF.sub.3 and --CF.sub.2 CF.sub.2 CF.sub.3 or where both R groups of a formula together are --(CF.sub.2).sub.2 --, --(CF.sub.2).sub.3 -- or --(CF.sub.2).sub.4 --. Suitable catalysts include carbon catalysts and catalysts containing at least one compound of a selected metal (e.g., Na, K, Rb, Cs, Y, La, Ce, Pr, Nd, Sm, Cr, Fe, Co, Rh, Ni, Cu, and/or Zn) supported on carbon.The saturated gem-dihydro- products may also be produced by hydrofluorinating the corresponding olefinic product over such catalysts at an elevated temperature, and can be combined with various other miscible solvents to form compositions useful for cleaning. Compounds such as CF.sub.3 CF.sub.2 CH.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CH.sub.
    Type: Grant
    Filed: August 28, 1991
    Date of Patent: December 7, 1993
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: V. N. Mallikarjuna Rao, Frank J. Weigert, Carl G. Krespan
  • Patent number: 5258561
    Abstract: 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: Grant
    Filed: November 6, 1992
    Date of Patent: November 2, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Mario J. Nappa, V. N. Mallikarjuna Rao
  • Patent number: 5250213
    Abstract: The compound, 1,1,1,2,2,3,3,4,4,5,6-undecafluorohexane, and mixtures thereof with alcohols, ethers, esters, ketones, nitromethane, and halogenated hydrocarbons are disclosed; as is the use thereof for cleaning a solid surface by treating the surface with said compound or said mixtures.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: October 5, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Shlomo Rozen, Frank J. Weigert
  • Patent number: 5244924
    Abstract: A diluent for perfluorocarbons used for retinal unfolding (unfolding PFCL), consisting of a perfluorocarbon (diluent PFCL), which has a low viscosity and is volatile at room temperature, with a boiling point between body temperature (about 38.degree. C.) and 100.degree. C., for removing residual quantities of unfolding PFCL from the eye after performance of a retinal unfolding treatment. A method of treatment consisting of introducing into an eye the above diluent for the above purpose.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: September 14, 1993
    Assignee: Adatomed Pharmazeutische und Medizintechnische Gesellschaft mbH
    Inventor: Hasso Meinert
  • Patent number: 5219489
    Abstract: Azeotrope-like compositions comprising 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and methanol are stable and have utility as degreasing agents and as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing of printed circuit boards and dry cleaning.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: June 15, 1993
    Assignee: Allied-Signal Inc.
    Inventors: Ellen L. Swan, Rajat S. Basu, Michael Van Der Puy
  • Patent number: 5196614
    Abstract: The present invention relates to a novel, catalyst-free method for preparing brominated telomers of chlorotrifluoroethylene. The process comprises reacting chlorotrifluoroethylene with a brominated telogen at a temperature in excess of 200.degree. C. for a time sufficient to produce the telomer.
    Type: Grant
    Filed: April 29, 1992
    Date of Patent: March 23, 1993
    Assignee: Dow Corning Corporation
    Inventors: Gerardo Caporiccio, Gerald A. Gornowicz, Bernard Boutevin
  • Patent number: 5171899
    Abstract: A process for production of 1,1,1-trifluoro-2,2-dichloroethane comprising chlorinationo f 1,1,1-trifluoro-2-chloroethane with chlorine gas in the presence or absence of a metal salt as a catalyst.
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: December 15, 1992
    Assignee: Daikin Industries Ltd.
    Inventors: Yasuhisa Furutaka, Yukio Homoto, Tsunetoshi Honda
  • Patent number: 5152845
    Abstract: A method of cleaning a surface of a substrate is provided. The method comprises treating the surface with a solvent comprising 1-chloro-3,3,3-trifluoropropane.
    Type: Grant
    Filed: March 18, 1991
    Date of Patent: October 6, 1992
    Assignee: Allied-Signal Inc.
    Inventor: Chien C. Li
  • Patent number: H1188
    Abstract: A process for the preparation of 1,1-dichloro-1,2-difluoroethane (HCFC-132c) comprising contacting 1,1-dichloroethylene with lead dioxide and anhydrous hydrogen fluoride. Addition of fluorine to the double bond of vinylidene chloride can be achieved using inexpensive and readily available commercial raw materials.
    Type: Grant
    Filed: September 19, 1990
    Date of Patent: May 4, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Mario J. Nappa, Allen C. Sievert