Acyclic Patents (Class 570/134)
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Patent number: 5780691Abstract: The invention provides a process for production of 1,1,1,2,3,3,3-heptafluoropropane, HFC-227ea. In particular, the invention provides an inexpensive process for producing HFC-227ea in good yield by reacting 1,1,1,3,3,3-hexafluoropropane, HFC-236fa, with elemental fluorine in an inert gas.Type: GrantFiled: December 23, 1996Date of Patent: July 14, 1998Assignee: Allied Signal Inc.Inventors: Hsueh Sung Tung, Lois Anne Ellis
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Patent number: 5763701Abstract: 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: GrantFiled: March 18, 1996Date of Patent: June 9, 1998Assignee: Solvay (Societe Anonyme)Inventors: Hans-Matthias Deger, Werner Krause, Dieter Schmid, Martin Hoeveler
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Patent number: 5760282Abstract: 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: GrantFiled: June 2, 1995Date of Patent: June 2, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Ralph Thomas Baker, Richard Paul Beatty, William Brown Farnham, Robert Lewis Wallace, Jr.
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Patent number: 5753776Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.Type: GrantFiled: June 6, 1995Date of Patent: May 19, 1998Assignee: Exfluor Research CorporationInventors: Thomas R. Bierschenk, Timothy J. Juhlke, Hajimu Kawa, Richard J. Lagow
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Patent number: 5728884Abstract: 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: GrantFiled: December 18, 1995Date of Patent: March 17, 1998Assignee: SolvayInventors: Ulrich Hahn, Raimund Franz, Gunter Siegemund
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Patent number: 5723699Abstract: 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: GrantFiled: January 24, 1997Date of Patent: March 3, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Ralph Newton Miller, Mark Richard Deschere, Barry Asher Mahler, Olagappan Muthu
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Patent number: 5716541Abstract: 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: GrantFiled: September 23, 1996Date of Patent: February 10, 1998Assignee: Bayer CorporationInventors: Joachim Werner, Scott A. Kane, Charles E. Mortimer, Herman P. Doerge, Eric F. Boonstra
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Patent number: 5714654Abstract: 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: GrantFiled: December 8, 1995Date of Patent: February 3, 1998Assignee: Daikin Industries Ltd.Inventors: Akinori Yamamoto, Eiji Seki, Hirokazu Aoyama, Tatsuo Nakada
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Patent number: 5705716Abstract: 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: GrantFiled: June 6, 1995Date of Patent: January 6, 1998Assignee: AlliedSignal Inc.Inventor: Chien Chi Li
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Patent number: 5705718Abstract: 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: GrantFiled: October 15, 1996Date of Patent: January 6, 1998Assignee: Elf Atochem S.A.Inventors: Bernard Cheminal, Andre Lantz
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Patent number: 5696307Abstract: 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: GrantFiled: January 21, 1994Date of Patent: December 9, 1997Assignee: AlliedSignal Inc.Inventors: Michael Van Der Puy, Rajat Subhra Basu, David Nalewajek, Lois A. Ellis
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Patent number: 5681902Abstract: 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: GrantFiled: January 11, 1996Date of Patent: October 28, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventor: Donald Douglas May
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Patent number: 5675046Abstract: 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: GrantFiled: April 10, 1996Date of Patent: October 7, 1997Assignee: Showa Denko K.K.Inventors: Hiromoto Ohno, Tetsuo Nakajo, Tatsuharu Arai, Toshio Ohi
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Patent number: 5672294Abstract: 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: GrantFiled: April 10, 1996Date of Patent: September 30, 1997Assignee: AlliedSignal Inc.Inventors: Earl August Eugene Lund, deceased, Robert Christian Parker, Ian Robert Shankland
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Patent number: 5629458Abstract: 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: GrantFiled: July 26, 1996Date of Patent: May 13, 1997Assignee: AlliedSignal Inc.Inventors: Alagappan Thenappan, Michael Van Der Puy, Richard Eibeck
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Patent number: 5629460Abstract: 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: GrantFiled: July 26, 1996Date of Patent: May 13, 1997Assignee: AlliedSignal Inc.Inventors: Alagappan Thenappan, Michael Van Der Puv, Richard Eibeck
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Patent number: 5578278Abstract: 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: GrantFiled: May 31, 1995Date of Patent: November 26, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: David J. Fall, Miguel A. Guerra
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Patent number: 5571870Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.Type: GrantFiled: May 10, 1994Date of Patent: November 5, 1996Assignee: Exfluor Research CorporationInventors: Thomas R. Bierschenk, Timothy Juhlke, Hajimu Kawa, Richard J. Lagow
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Patent number: 5557018Abstract: 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: GrantFiled: September 13, 1995Date of Patent: September 17, 1996Assignee: E. I. du Pont de Nemours and CompanyInventors: Bruce E. Smart, Zhen-Yu Yang
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Patent number: 5557019Abstract: 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: GrantFiled: August 24, 1994Date of Patent: September 17, 1996Assignee: Daikin Industries Ltd.Inventors: Hirokazu Aoyama, Satoru Kohno, Satoshi Koyama
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Patent number: 5545769Abstract: 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: GrantFiled: September 29, 1994Date of Patent: August 13, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Ralph T. Baker, Richard P. Beatty, William B. Farnham, Robert L. Wallace, Jr.
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Patent number: 5531916Abstract: 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: GrantFiled: October 13, 1993Date of Patent: July 2, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventor: Abid N. Merchant
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Patent number: 5527975Abstract: 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: GrantFiled: February 13, 1995Date of Patent: June 18, 1996Assignee: Albemarle CorporationInventors: Dominique Cosserat, Francois Stutz
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Patent number: 5488142Abstract: 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: GrantFiled: October 4, 1993Date of Patent: January 30, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: David J. Fall, Miguel A. Guerra
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Processes for the preparation of fluorinated olefins and hydrofluorocarbons using fluorinated olefin
Patent number: 5481050Abstract: 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: GrantFiled: March 28, 1995Date of Patent: January 2, 1996Assignee: AlliedSignal Inc.Inventors: Michael Van Der Puy, G. V. Bindu Madhavan, Alagappan Thenappan, Hsueh S. Tung -
Patent number: 5478486Abstract: 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: GrantFiled: November 18, 1993Date of Patent: December 26, 1995Assignee: Henkel CorporationInventor: Michael J. Incorvia
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Patent number: 5463149Abstract: 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: GrantFiled: July 12, 1994Date of Patent: October 31, 1995Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Takehiko Fukumoto, Daisuke Iwai, Shigeo Okano, Hiroshi Suzuki, Mitsuyoshi Oshima
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Patent number: 5461117Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.Type: GrantFiled: June 13, 1994Date of Patent: October 24, 1995Assignee: Exfluor Research CorporationInventors: Thomas R. Bierschenk, Timothy J. Juhlke, Hajimu Kawa, Richard J. Lagow
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Processes for the preparation of fluorinated olefins and hydrofluorocarbons using fluorinated olefin
Patent number: 5446217Abstract: 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: GrantFiled: May 16, 1994Date of Patent: August 29, 1995Assignee: AlliedSignal Inc.Inventors: Michael Van Der Puy, G. V. Bindu Madhavan, Alagappan Thenappan, Hsueh S. Tung -
Patent number: 5423994Abstract: 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: GrantFiled: March 26, 1993Date of Patent: June 13, 1995Assignee: Enichem Synthesis S.p.A.Inventors: Enrico Traverso, Antonio Rinaldi
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Patent number: 5421964Abstract: 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: GrantFiled: April 30, 1993Date of Patent: June 6, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Barry A. Mahler, Vinci M. Felix, Ralph N. Miller
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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
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Patent number: 5354928Abstract: 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: GrantFiled: May 24, 1993Date of Patent: October 11, 1994Assignee: Societe AtochemInventors: Bernard Cheminal, Eric Lacroix, Andre Lantz
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Patent number: 5352785Abstract: 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: GrantFiled: March 30, 1993Date of Patent: October 4, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Thomas C. Herzberg, Robert B. Fletcher, Randall F. Henderson
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Patent number: 5332790Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.Type: GrantFiled: March 8, 1993Date of Patent: July 26, 1994Assignee: Exfluor Research CorporationInventors: Thomas R. Bierschenk, Timothy Juhlke, Hajimu Kawa, Richard J. Lagow
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Patent number: 5322904Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.Type: GrantFiled: March 8, 1993Date of Patent: June 21, 1994Assignee: Exfluor Research CorporationInventors: Thomas R. Bierschenk, Timothy J. Juhlke, Hajimu Kawa, Richard J. Lagow
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Patent number: 5322903Abstract: This invention pertains to a method for liquid phase fluorination for perfluorination of a wide variety of hydrogen-containing compounds.Type: GrantFiled: January 17, 1992Date of Patent: June 21, 1994Assignee: Exfluor Research CorporationInventors: Thomas R. Bierschenk, Timothy Juhlke, Hajimu Kawa, Richard J. Lagow
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Patent number: 5315044Abstract: 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: GrantFiled: September 9, 1992Date of Patent: May 24, 1994Assignee: Daikin Industries Ltd.Inventors: Yasuhisa Furutaka, Yukio Homoto, Tsunetoshi Honda
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Patent number: 5304702Abstract: Polyhalogenated organic compounds, such as polychlorinated dibenzodioxines, dibenzofurans, biphenyls, biphenyl ethers, phenols, benzenes and cyclohexanes as well as chlorofluorohydrocarbons are destroyed by reaction with a surplus of strongly basic hydrocarbon-soluble, strongly basic lithium compounds in an inert solvent at reaction temperatures from 0.degree. to 200.degree. C.Type: GrantFiled: March 13, 1992Date of Patent: April 19, 1994Assignee: Metallgesellschaft AGInventors: Wilfried Weiss, Klaus Kobele
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Patent number: 5302764Abstract: 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: GrantFiled: June 29, 1992Date of Patent: April 12, 1994Assignees: 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
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Patent number: 5274189Abstract: 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: GrantFiled: May 24, 1993Date of Patent: December 28, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Mario J. Nappa, Allen C. Sievert
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Patent number: 5268516Abstract: 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: GrantFiled: January 13, 1993Date of Patent: December 7, 1993Assignee: Elf Atochem S.A.Inventors: Rene Bertocchio, Georges Lacote, Christophe Verge
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Patent number: 5268122Abstract: 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: GrantFiled: August 28, 1991Date of Patent: December 7, 1993Assignee: E. I. du Pont de Nemours and CompanyInventors: V. N. Mallikarjuna Rao, Frank J. Weigert, Carl G. Krespan
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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
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Patent number: 5250213Abstract: 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: GrantFiled: May 6, 1991Date of Patent: October 5, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Shlomo Rozen, Frank J. Weigert
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Diluent for perfluorocarbons employed for retinal unfolding (unfolding PFCL) and method of treatment
Patent number: 5244924Abstract: 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: GrantFiled: January 24, 1992Date of Patent: September 14, 1993Assignee: Adatomed Pharmazeutische und Medizintechnische Gesellschaft mbHInventor: Hasso Meinert -
Patent number: 5219489Abstract: 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: GrantFiled: August 15, 1991Date of Patent: June 15, 1993Assignee: Allied-Signal Inc.Inventors: Ellen L. Swan, Rajat S. Basu, Michael Van Der Puy
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Patent number: 5196614Abstract: 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: GrantFiled: April 29, 1992Date of Patent: March 23, 1993Assignee: Dow Corning CorporationInventors: Gerardo Caporiccio, Gerald A. Gornowicz, Bernard Boutevin
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Patent number: 5171899Abstract: 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: GrantFiled: September 21, 1990Date of Patent: December 15, 1992Assignee: Daikin Industries Ltd.Inventors: Yasuhisa Furutaka, Yukio Homoto, Tsunetoshi Honda
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Patent number: H1188Abstract: 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: GrantFiled: September 19, 1990Date of Patent: May 4, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Mario J. Nappa, Allen C. Sievert