Patents Examined by Alan Siegel
  • Patent number: 6720465
    Abstract: A process for preparing purified, saturated, partially fluorinated or perfluorinated hydrocarbon compounds from crude products which are contaminated with impurity compounds which absorb light at a wavelength of &lgr;>200 nm by irradiating the crude product with UV radiation of a wavelength of &lgr;>200 nm and thereafter recovering highly pure, partially fluorinated or perfluorinated hydrocarbon compounds from the irradiated reaction product, for example, by simple vacuum distillation.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: April 13, 2004
    Assignee: Solvay Fluor und Derivate GmbH
    Inventors: Max Braun, Carsten Brosch, Heinz Gress
  • Patent number: 6710216
    Abstract: In a closed-loop biomass extraction apparatus (10), strategies for purifying HFC solvents used therein include: (i) contacting an adsorbent and a desiccant, e.g. in a container (26) with contaminated HFC solvent branched from the main flow loop; and, optionally, (ii) washing contaminated HFC solvent with water, e.g. in a vessel (34) to separate a co-solvent or entrainer, such as ethanol, thereform.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: March 23, 2004
    Assignee: Imperial Chemical Industries PLC
    Inventors: Stuart Corr, Paul A. Dowdle, Robert E. Low, James David Morrison, Frederick Thomas Murphy
  • Patent number: 6566567
    Abstract: The present invention relates to a catalyst for producing 1,1-difluoroethane (HCFC-152a) and producing method thereof. More particularly, it is to provide the catalyst prepared by impregnating palladium on the active carbon pretreated with an aqueous hydrogen fluoride solution and an aqueous hydrogen chloride solution in series and its use in the production of 1,1-difluoroethane (HCFC-142b) by dehydrochlorinating 1,1-difluoro-1-chloroethane at 240-300° C. in the supplying molar ratio of 2-6 (H2/HCFC-142b) with maximizing a selectivity toward the product of HCFC-152a.
    Type: Grant
    Filed: July 5, 2001
    Date of Patent: May 20, 2003
    Assignee: Korea Institute of Science and Technology
    Inventors: Byoung Sung Ahn, Jung Hwan Song, Dong Ju Moon, Kun You Park
  • Patent number: 6551469
    Abstract: A process for preparing 1-chloro-1,1,3,3,3-pentafluoropropane, CF3CH2CF2Cl, comprising contacting in a reaction zone in the substantial absence of oxygen, reactants comprising chlorine and 1,1,1,3,3-pentafluoropropane, CF3CH2CHF2 (also referred to as HFC-245fa), and subjecting the reactants to actinic radiation, such as UV light at about 2,000 to 4,000 Angstroms, wherein: (1) inert gas is present at a concentration equal to or less than about 5 wt. % of the total weight of reactants; (2) the molar ratio of chlorine to CF3CH2CHF2 is from about 0.2:1 to about 1.5:1; and (3) the concentration of chlorinated product produced having greater than one chlorine present in the molecule is less than or equal to about 10 wt. %.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: April 22, 2003
    Assignee: Honeywell International
    Inventors: Haridasan K. Nair, Michael Van Der Puy, David Nalewajek, Timothy R. Demmin, Andrew J. Poss, David E. Bradley, Ian R. Shankland, Martin E. Cheney
  • Patent number: 6552238
    Abstract: Provided is a method and system for separating heavy ends from a halogenated alkane in a waste stream. The method includes: (a) removing a bottom fraction containing heavy ends from a catalyst recovery unit and conveying the bottom fraction to a vessel; (b) introducing steam into the bottom fraction containing heavy ends; (c) removing a halogenated alkane vapor and a water vapor from the waste treatment unit; (d) condensing the halogenated alkane and water vapors; and (e) separating the halogenated alkane phase and water phase from the heavy ends.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: April 22, 2003
    Assignee: Vulcan Chemicals
    Inventors: Eric L. Mainz, Richard L. Wilson
  • Patent number: 6548719
    Abstract: A process for producing a fluoroolefin of the formula: CF3CY═CXnHp wherein Y is a hydrogen atom or a halogen atom (i.e., fluorine, chlorine, bromine or iodine); X is a hydrogen atom or a halogen atom (i.e., fluorine, chlorine, bromine or iodine); n and p are integers independently equal to 0, 1 or 2, provided that (n+p)=2; comprising contacting, in the presence of a phase transfer catalyst, a compound of the formula: CF3C(R1aR2b)C(R3cR4d), wherein R1, R2, R3, and R4 are independently a hydrogen atom or a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine, provided that at least one of R1, R2, R3, and R4 is halogen and there is at least one hydrogen and one halogen on adjacent carbon atoms; a and b are independently=0, 1 or 2 and (a+b)=2; and c and d are independently=0, 1, 2 or 3 and (c+d)=3; and at least one alkali metal hydroxide.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: April 15, 2003
    Assignee: Honeywell International
    Inventors: Haridasan K. Nair, Michael Van Der Puy, David Nalewajek, Timothy R. Demmin, Andrew J. Poss, David E. Bradley, Ian R. Shankland
  • Patent number: 6538165
    Abstract: According to a process for producing difluoromethane and difluorochloromethane, which comprises fluorinating dichloromethane and trichloromethane with hydrogen fluoride in a liquid phase in the presence of a catalyst in one reaction apparatus under the conditions that a reaction pressure is from 1 to 20 kg/cm2 and a reaction temperature is from 50 to 150° C., difluoromethane and difluorochloroethane can be simultaneously or alternatively produced in an economical/safe manner by one reaction apparatus.
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: March 25, 2003
    Assignee: Daikin Industries Ltd.
    Inventors: Takehide Tsuda, Takashi Shibanuma
  • Patent number: 6534688
    Abstract: A process is provided for the stabilization of polychlorinated alkanes against dehydrochlorination. The process comprises adding a phenol compound to a polychlorinated alkane such that the dehydrochlorination of the polychlorinated alkane is suppressed when heated in the presence of iron(III). In a preferred embodiment, the process comprises the prevention or reduction of dehydrochlorination of 1,1,1,3,3-pentachloropropane when heated in the presence of iron(III) contamination by the addition of monomethyl ether hydroquinone. In another embodiment, the long term storage stability of polychlorinated alkanes against dehydrochlorination is improved due to the addition of a phenol compound.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: March 18, 2003
    Assignee: Vulcan Chemicals
    Inventor: Rodney L. Klausmeyer
  • Patent number: 6528693
    Abstract: 1-chloropropylethyne is prepared by dehydrochlorination with a base of 1-chloro-1-cyclopropylethene, which is itself prepared by treating 1-cyclopropylethanone with dichlorotriarylphosphorane or dichlorotrialkylphosphorane in the presence of a base.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: March 4, 2003
    Assignee: Great Lakes (UK) Limited
    Inventors: Robert Gandy, Peter John Cremins, Allan Williams Timms
  • Patent number: 6528691
    Abstract: A gas phase process for the preparation of 245fa is provided, wherein 1233zd is contacted with HF in the presence of a supported antimony catalyst.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: March 4, 2003
    Assignee: Atofina Chemicals, Inc.
    Inventors: Maher Y. Elsheikh, Bin Chen
  • Patent number: 6528692
    Abstract: Provided is a process for producing a bromo-aromatic condensed ring compound which comprises reacting an aromatic condensed ring compound in which the number of carbon atom constituting the aromatic condensed ring is 15 or more with a N-bromo carboxylic acid amide in the presence of a chlorinated hydrocarbon compound and sulfuric acid to brominate said aromatic condensed ring compound.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: March 4, 2003
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Takahiro Ueoka, Hideyuki Ikehira
  • Patent number: 6521803
    Abstract: Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, according to which a hydrofluoroalkane/hydrogen fluoride mixture is reacted with at least one chlorinated or chlorofluorinated precursor of the hydrofluoroalkane. Process for the preparation of a hydrofluoroalkane comprising such a separation, in combination with a catalytic reaction stage. Azeotropic compositions.
    Type: Grant
    Filed: July 17, 2001
    Date of Patent: February 18, 2003
    Assignee: Solvay (Societe Anonyme)
    Inventors: Alain Lambert, Vincent Wilmet
  • Patent number: 6521802
    Abstract: The present invention provides a process for preparing a fluorine-containing halogenated hydrocarbon compound by fluorinating, in a reaction field where an antimony halide compound represented by the general formula: SbClpF5−p  (I) wherein p is a value within a range from 0 to 2, and hydrogen fluoride and a halogenated hydrocarbon compound as a raw material exist, the halogenated hydrocarbon compound in a molar ratio of the antimony halide compound to hydrogen fluoride within a range from 40/60 to 90/10. According to this process, a fluorine-containing halogenated hydrocarbon compound (HFC), which is important as a substitute compound of CFC or HCFC, can be prepared economically advantageously with good selectivity while suppressing a corrosive action of a reaction vessel.
    Type: Grant
    Filed: May 29, 2002
    Date of Patent: February 18, 2003
    Assignee: Daikin Industries, Ltd.
    Inventors: Seiji Takubo, Noriaki Shibata, Tatsuo Nakada, Takashi Shibanuma
  • Patent number: 6518467
    Abstract: A method of producing hydrofluorocarbons and/or hydrochlorofluorocarbons by using halogenated alkanes as a principal reactant. Generally, the method comprises the step of: (a) reacting a starting halogenated alkane corresponding to the formula (I): H3C—CX3  (I) wherein X is independently fluorine or chlorine, with a hydrohalocarbon adduct in the presence of a catalyst to form a hydrofluorocarbon and/or hydrochlorofluorocarbon.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: February 11, 2003
    Assignee: Honeywell International Inc.
    Inventors: Hsueh Sung Tung, Michael Van Der Puy
  • Patent number: 6515163
    Abstract: The invention concerns hydrogenated phenanthrenes of formula I wherein the parameters have the meanings given in the text and their use in liquid crystal compositions.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: February 4, 2003
    Assignee: Merck Patent Gesellschaft
    Inventors: Rainer Wingen, Barbara Hornung, Wolfgang Schmidt
  • Patent number: 6515187
    Abstract: A method of purifying acrolein or propionaldehyde with a single column distillation system is provided, where the distillation system has a side-draw take-off outlet for recovering purified acrolein or propionaldehyde located between the crude product feed point and the light-boiling impurities distillation site.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: February 4, 2003
    Assignee: Atofina Chemicals, Inc.
    Inventors: Steven Gabriel Schon, Samuel Marc Daniel, Richard Alan Sander
  • Patent number: 6512150
    Abstract: A gaseous process for reducing the amount of chloropentafluoroethane (CFC 115) impurity present in pentafluoroethane (HFC 125) characterized in that pentafluroethane is allowed to flow on a catalyst formed by a trivalent chromium salt, optionally supported, at temperatures in the range 200° C.-400° C., obtaining the reaction of chloropentafluoroethane with pentafluoroethane with formation of hexafluoroethane (FC 116) and tetrafluorochloroethane (HCFC 124).
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: January 28, 2003
    Assignee: Ausimont S.p.A.
    Inventors: Paolo Cuzzato, Sergio Peron
  • Patent number: 6509495
    Abstract: The invention concerns a selective hydrodehalogenation method characterised in that it comprises a step which consists in contacting a substrate including a sp 3 hybridisation carbon atom bearing an electro-attracting group and at least a fluorine atom, and a halogen atom heavier than fluorine, with a reagent comprising: an aqueous phase, a base, a group VIII metal as hydrogenation catalyst, and hydrogen dissolved in the aqueous phase, at a concentration in equilibrium with a gas phase whereof the partial pressure in hydrogen is not less than 50 kPa, advantageously ranging between 50 kPa and 2.10 7 Pa. The invention is applicable to organic synthesis.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: January 21, 2003
    Assignee: Rhodia Chimie
    Inventors: Georges Cordier, Roland Jacquot
  • Patent number: 6506952
    Abstract: Hexabromocyclododecane with enhanced gamma isomer content is produced by brominating cyclododecatriene in a liquid medium comprised of (1) at least 50 wt % of at least one liquid inert organic solvent other than 1,4-dioxane having a solubility in water of at least 1 wt % at 25° C., and (2) water in an amount of up to about 40 wt %, in the presence of (3) about 0.5 to about 30 wt % of bromide ion (Br−), each wt % being based on the total weight of the liquid portion of the liquid medium.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: January 14, 2003
    Assignee: Albemarle Corporation
    Inventor: John K. Kendall
  • Patent number: 6506950
    Abstract: The compounds CF3CHFCHFCF2CF3, CF3CH2CHFCF2CF3, CF3CHFCH2CF2CF3, CF3CHFCHFCF2CF2CF3, CF3CH2CHFCF2CF2CF3, CF3CHFCH2CF2CF2CF3, CF3CF2CH2CHFCF2CF3, CF3CF2CHFCHFCF2CF2CF3, CF3CHFCHFCF2CF2CF2CF3, CF3CHFCH2CF2CF2CF2CF3, CF3CH2CHFCF2CF2CF2CF3, CF3CF2CHFCH2CF2CF2CF3, and CF3CF2CH2CHFCF2CF2CF3; and compositions thereof. Catalytic processes using Group VIII metals are disclosed for reacting selected olefinic starting materials with hydrogen to produce as the major products dihydropolyfluoroalkanes or trihydropolyfluoroalkanes wherein the hydrogens are positioned on two adjacent carbon atoms; as are processes using iodine and/or hydrogen iodide in the reduction of selected olefinic starting materials to dihydropolyfluoroalkanes or trihydropolyfluoroalkanes.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: January 14, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Carl George Krespan