Halogenated Hydrocarbon Patents (Class 203/67)
  • Patent number: 11667597
    Abstract: Disclosed is a method for linkage recovery of an organic acid in an aqueous organic acid solution. The method comprises: mixing a solution with an organic acid concentration lower than 20 wt % with a specific extractant and then subjecting same to counter-current extraction so as to obtain an extract phase and a raffinate phase; and subjecting the extract phase together with a solution with an acid concentration higher than 70 wt % to an azeotropic rectification so as to recover an organic acid. When the concentration of the aqueous organic acid solution is 20 wt %-70 wt %, the aqueous organic acid solution is extracted and concentrated to make the concentration of the aqueous organic acid solution higher than 70 wt %.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: June 6, 2023
    Assignee: GUANGZHOU YINNOVATOR BIOTECH CO., LTD.
    Inventors: Ruizhe Zhang, Yunsi Liu
  • Patent number: 10934234
    Abstract: Disclosed is a process for preparing a chlorinated alkene, comprising contacting a chlorinated alkane with a catalyst in a dehydrochlorination zone to produce a liquid reaction mixture comprising the chlorinated alkane and the chlorinated alkene, and extracting chlorinated alkene from the reaction mixture, wherein the concentration of the chlorinated alkene in the reaction mixture present in the dehydrochlorination zone is controlled such that the molar ratio of chlorinated alkene:chlorinated alkane is from 1:99 to 50:50.
    Type: Grant
    Filed: December 25, 2018
    Date of Patent: March 2, 2021
    Assignee: SPOLEK PRO CHEMICKOU A HUTNI VYROBU A.S.
    Inventors: Zdenek Ondrus, Pavel Kubicek, Karel Filas, Petr Sladek
  • Patent number: 10851303
    Abstract: The present application discloses compositions comprising hydrogen fluoride and fluorinated compounds (e.g., hydrochlorofluorocarbons), wherein the fluorinated compound is present in the composition in an amount effective to form an azeotrope composition or azeotrope-like composition with the hydrogen fluoride.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: December 1, 2020
    Assignee: THE CHEMOURS COMPANY FC, LLC
    Inventors: Jeffrey Knapp, Sheng Peng, Olagappan Muthu
  • Patent number: 9638371
    Abstract: To provide a method for storing trifluoroethylene filled in a container for storage, transportation, etc., stably without causing a reaction such as polymerization. The method is characterized in that trifluoroethylene is stored in a sealed container in such a state that a gas phase and a liquid phase coexist, and in the gas phase, the concentration of oxygen at a temperature of 25° C. is kept to be at most 1,000 ppm by volume.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: May 2, 2017
    Assignee: Asahi Glass Company, Limited
    Inventors: Masaaki Tsuzaki, Masato Fukushima, Maki Shigematsu
  • Patent number: 9000238
    Abstract: The present disclosure relates to a process for separating a fluoroolefin from a mixture comprising hydrogen fluoride and fluoroolefin, comprising azeotropic distillation both with and without an entrainer. In particular are disclosed processes for separating any of HFC-1225ye, HFC-1234ze, HFC-1234yf or HFC-1243zf from HF.
    Type: Grant
    Filed: August 16, 2012
    Date of Patent: April 7, 2015
    Assignee: E I du Pont de Nemours and Company
    Inventors: Jeffrey P. Knapp, Barry Asher Mahler, Donald J. Toton
  • Patent number: 8877017
    Abstract: The present invention provides a novel method for separating hexafluoropropylene oxide (HFPO) from hexafluoropropylene (HFP), which is capable of reducing the burden on the environment. A mixture including HFPO and HFP is subjected to an extractive distillation operation using, as a solvent, at least one of a fluorine-containing saturated compound represented by the general formula CnHaFb (wherein n, a and b are integers which satisfy: n=3 to 8, 0?a?2n+1, and 1?b?2n+2) thereby separating into a first fraction including HFPO and a second fraction including HFP and the solvent. At least one of 1-bromopropane and 2-bromopropane may be u as the solvent in place of the fluorine-containing saturated compound.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: November 4, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Hideki Nakaya, Kazuyoshi Ichihara, Yasuhide Senba, Mikio Nakagoshi, Kazunori Morimoto
  • Patent number: 8691055
    Abstract: The present disclosure relates to processes and systems for purifying technical grade trichlorosilane and/or technical grade silicon tetrachloride into electronic grade trichlorosilane and/or electronic grade silicon tetrachloride.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: April 8, 2014
    Assignee: MEMC Electronic Materials SpA
    Inventor: Gianfranco Ghetti
  • Patent number: 8658846
    Abstract: Disclosed herein are processes for separation of 2,3,3,3-tetrafluoropropene and hydrogen fluoride using azeotropic distillation. Additionally, disclosed are processes for separating mixtures of 2,3,3,3-tetrafluoropropene, hydrogen fluoride and 1,1,1,2,3-pentafluoropropane (HFC-245eb) and/or 1,1,1,2,2-pentafluoropropane (HFC-245cb) by azeotropic distillation.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: February 25, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventor: Jeffrey P. Knapp
  • Patent number: 8628644
    Abstract: The present invention relates to a process for separating close-boiling and azeotropic components of mixtures, wherein said mixtures contain at least one hydrofluorocarbon compound, using at least one ionic liquid.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: January 14, 2014
    Assignee: E I du Pont Nemours and Company
    Inventors: Mark B. Shiflett, Akimichi Yokozeki
  • Publication number: 20130190531
    Abstract: The phase separation in the decanter of a process for producing acetic acid by carbonylating methanol in the presence of a catalyst under low water-high acid conditions is facilitated and expedited by forming a liquid mixture (D) which has a water content of at most 10% by weight, based on the weight of the liquid mixture, an acetic acid content of at least 10% by weight, based on the weight of the liquid mixture, and a weight ratio of methyl iodide to methyl acetate of at least 1.5:1, and partitioning the liquid mixture at a temperature of from 0 to 35° C.
    Type: Application
    Filed: December 19, 2012
    Publication date: July 25, 2013
    Inventors: Lyondell Chemical Technology, L.P., Equistar Chemicals, LP
  • Publication number: 20120305382
    Abstract: The present disclosure relates to a process for separating a fluoroolefin from a mixture comprising hydrogen fluoride and fluoroolefin, comprising azeotropic distillation both with and without an entrainer. In particular are disclosed processes for separating any of HFC-1225ye, HFC-1234ze, HFC-1234yf or HFC-1243zf from HF.
    Type: Application
    Filed: August 16, 2012
    Publication date: December 6, 2012
    Applicant: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Jeffrey P. KNAPP, Barry Asher MAHLER, Donald J. TOTON
  • Publication number: 20120261252
    Abstract: Disclosed herein are processes for separation of 2,3,3,3-tetrafluoropropene and hydrogen fluoride using azeotropic distillation. Additionally, disclosed are processes for separating mixtures of 2,3,3,3-tetrafluoropropene, hydrogen fluoride and 1,1,1,2,3-pentafluoropropane (HFC-245eb) and/or 1,1,1,2,2-pentafluoropropane (HFC-245cb) by azeotropic distillation.
    Type: Application
    Filed: February 19, 2009
    Publication date: October 18, 2012
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventor: Jeffrey P. Knapp
  • Patent number: 8282792
    Abstract: The present disclosure relates to processes and systems for purifying technical grade trichlorosilane and/or technical grade silicon tetrachloride into electronic grade trichlorosilane and/or electronic grade silicon tetrachloride.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: October 9, 2012
    Assignee: MEMC Electronic Materials S.p.A.
    Inventor: Gianfranco Ghetti
  • Patent number: 8257557
    Abstract: A dehydration method for removing water from a hydrolysis reaction mixture containing unreacted water generated when monochlorobenzene is hydrolyzed to produce phenol, the method for dehydrating the hydrolysis reaction mixture includes supplying a hydrolysis reaction mixture to a distillation tower, supplying a liquid containing monochlorobenzene to the tower top portion of the distillation tower, and removing the substantially whole amount of the water in the hydrolysis reaction mixture together with monochlorobenzene from the tower top portion by distillation.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: September 4, 2012
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Tateo Seo, Tetsuya Suzuta, Toshiaki Ui
  • Patent number: 8168837
    Abstract: Provided is a process for purifying an organic feedstock comprising (a) distilling a raw organic feedstock comprising hydrogen fluoride, 2-chloro-1,1,1,2-tetrafluoropropane, and 2-chloro-3,3,3-trifluoropropene to produce a first distillate stream comprising an azeotrope-like composition of 2-chloro-1,1,1,2-tetrafluoropropane, 2-chloro-3,3,3-trifluoropropene, and hydrogen fluoride, and a first bottoms stream rich in hydrogen fluoride; (b) cooling said first distillate stream to produce an intermediate composition comprising an organic layer rich in 2-chloro-1,1,1,2-tetrafluoropropane and 2-chloro-3,3,3-trifluoropropene, and an acid layer rich in hydrogen fluoride; and, optionally but preferably, (c) distilling said organic layer to produce a second distillate stream comprising an azeotrope-like composition of 2-chloro-1,1,1,2-tetrafluoropropane, 2-chloro-3,3,3-trifluoropropene, and hydrogen fluoride, and a second bottoms stream comprising a purified organic feedstock substantially free of hydrogen fluoride.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: May 1, 2012
    Assignee: Honeywell International Inc.
    Inventors: Daniel C. Merkel, Konstantin A. Pokrovski, Hsueh Sung Tung
  • Publication number: 20120006672
    Abstract: The present invention provides a novel method for separating hexafluoropropylene oxide (HFPO) from hexafluoropropylene (HFP), which is capable of reducing the burden on the environment. A mixture including HFPO and HFP is subjected to an extractive distillation operation using, as a solvent, at least one of a fluorine-containing saturated compound represented by the general formula CnHaFb (wherein n, a and b are integers which satisfy: n=3 to 8, 0?a?2n+1, and 1?b?2n+2) thereby separating into a first fraction including HFPO and a second fraction including HFP and the solvent. At least one of 1-bromopropane and 2-bromopropane may be u as the solvent in place of the fluorine-containing saturated compound.
    Type: Application
    Filed: February 18, 2010
    Publication date: January 12, 2012
    Inventors: Hideki Nakaya, Kazuyoshi Ichihara, Yasuhide Senba, Mikio Nakagoshi, Kazunori Morimoto
  • Patent number: 8075742
    Abstract: An apparatus and process for the separation of refrigerant mixtures is provided. The apparatus includes a first distillation column, a first condenser, and a first collection vessel. The apparatus also includes a sorter vessel that includes a sorter agent, wherein the sorter vessel is fluidly connected to the first distillation column.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: December 13, 2011
    Assignee: Midwest Refrigerants, LLC
    Inventor: Gregorio Tarancon, III
  • Publication number: 20100314240
    Abstract: An extracting process includes adding 30 g of honeysuckle into a first flask in a cooling bath; adding 150 g bromomethane as a solvent into the first flask and sealing the first flask so that the solvent dissolves the honeysuckle powder to form a solution after about 15 hours; removing the first flask; and connecting the first flask to a first second flask and connecting a third flask to a last second flask wherein the second flasks are interconnected, each second flask is placed in another cooling bath, the third flask is placed in still another cooling bath, the solution evaporates to flow the vaporized aromatic compounds thereof to the second flasks for absorption by aromatic compounds absorbent fluid contained in each second flask, and the vaporized bromomethane of the solution reaches the third flask to be cooled and collected in the form of liquid.
    Type: Application
    Filed: September 30, 2009
    Publication date: December 16, 2010
    Inventors: Kai Lin, Hongliang Lu, Pengfei Ma
  • Patent number: 7803283
    Abstract: Provided are azeotropic and azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb). Such azeotropic and azeotrope-like compositions are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf).
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: September 28, 2010
    Assignee: Honeywell Internationl Inc.
    Inventors: Hang T. Pham, Rajiv R. Singh, Hsuehsung Tung, Konstantin A. Pokrovski, Daniel C. Merkel
  • Patent number: 7699962
    Abstract: The invention relates to methods for separating mixture components such as reactor effluent components. In particular, the invention relates to the use of an extractive agent such as a hydrocarbon in an extractive distillation process to separate monomers such as a C4-C7 isoolefins such as isobutylene from mixtures such as reactor effluents including one or more hydrofluorocarbon(s) (HFC).
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: April 20, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Michael Francis McDonald, Ralph Howard Schatz, Claude André Gautier, Richard Dwight Hembree
  • Publication number: 20090242832
    Abstract: Provided are azeotropic and azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb). Such azeotropic and azeotrope-like compositions are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf).
    Type: Application
    Filed: March 17, 2009
    Publication date: October 1, 2009
    Inventors: HANG T. PHAM, RAJIV R. SINGH, HSUEHSUNG TUNG, KONSTANTIN A. POKROVSKI, DANIEL C. MERKEL
  • Patent number: 7479477
    Abstract: Provided are azeotrope-like compositions comprising difluoromethane and trifluoroiodomethane and uses thereof, including use in refrigerant compositions, refrigeration systems, blowing agent compositions, and aerosol propellants.
    Type: Grant
    Filed: April 18, 2005
    Date of Patent: January 20, 2009
    Assignee: Honeywell International Inc.
    Inventors: David P. Wilson, Hang T. Pham, Rajiv R. Singh
  • Patent number: 7371309
    Abstract: The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12), 1,1,1-trifluoroethane (HFC-143a), chloropentafluoroethane (CFC-115), and pentafluoroethane (HFC-125) using hydrocarbon, chlorocarbon, and oxygen-containing extractive agents.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: May 13, 2008
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Sara W. Boehmer, Barry Asher Mahler, Ralph Newton Miller
  • Patent number: 7241928
    Abstract: A liquid phase process is disclosed for producing halogenated alkane adducts of the formula CAR1R2CBR3R4 (where A, B, R1, R2, R3, and R4 are as defined in the specification) which involves contacting a corresponding halogenated alkane, AB, with a corresponding olefin, CR1R2?CR3R4 in a dinitrile or cyclic carbonate ester solvent which divides the reaction mixture into two liquid phases and in the presence of a catalyst system containing (i) at least one catalyst selected from monovalent and divalent copper; and optionally (ii) a promoter selected from aromatic or aliphatic heterocyclic compounds which contain at least one carbon-nitrogen double bond in the heterocyclic ring. When hydrochlorofluorocarbons are formed, the chlorine content may be reduced by reacting the hydrochlorofluorocarbons with HF. New compounds disclosed include CF3CF2CCl2CH2CCl3, CF3CCl2CH2CH2Cl and CF3CCl2CH2CHClF. These compounds are useful as intermediates for producing hydrofluorocarbons.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: July 10, 2007
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Velliyur N.Mallikarjuna Rao, Allen Capron Sievert
  • Patent number: 7189311
    Abstract: A method for separating difluoromethane from a mixture of difluoromethane and at least one impurity, the method involving extractively distilling the mixture using dichloromethane as an extractive agent to recover a product stream of purified difluoromethane having a concentration of impurity lower than that of the mixture.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: March 13, 2007
    Assignee: Honeywell International Inc.
    Inventor: Paul G. Clemmer
  • Patent number: 7182841
    Abstract: This invention concerns a process for removing carbonyl-containing impurities from impure extractive distillation solvent such as a glycol, comprising: contacting the impure extractive distillation solvent with an acidic ion exchange resin. The purified extractive distillation solvent can be recycled for use as a solvent in an extractive distillation process that removes impurities from alkylene oxide. The extractive distillation solvent can be ethylene glycol monomethyl ether (EGME) used to purify propylene oxide.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: February 27, 2007
    Assignee: Huntsman International LLC
    Inventors: John R. Sanderson, Mark Mueller, James P. Farone
  • Patent number: 7153397
    Abstract: A process for the purification of fluoromethyl hexafluoroisopropyl ether which comprises contacting a crude composition comprising fluoromethyl hexafluoroisopropyl ether and hexafluoroisopropyl alcohol with a modifier in the presence of which the vapor pressure of the ether and/or the alcohol is modified whereby the difference in vapor pressure of the ether and the alcohol increases relative to the difference in vapor pressure of the ether and alcohol in the absence of the modifier and separating the ether from the alcohol.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: December 26, 2006
    Assignee: Ineos Fluor Holdings Limited
    Inventors: Andrew Paul Sharratt, Lee Colin Draper
  • Patent number: 7074434
    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: October 29, 2002
    Date of Patent: July 11, 2006
    Assignee: Solvay (Societe Anonyme)
    Inventors: Alain Lambert, Vincent Wilmet
  • Patent number: 7060165
    Abstract: The present invention involves processes that utilize an olefinic compound, in particular, hexafluoropropene (HFP) or chlorotrifluoroethene (CFC-1113) as extracting agents in the purification of pentafluoroethane (HFC-125). These processes can utilize recovered HFP as a precursor for the production of heptafluoropropane (HFC-227) or other derivatives.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: June 13, 2006
    Assignee: PCBU Services, Inc.
    Inventors: Stephan M. Brandstater, Mitchel Cohn, Victoria E. Hedrick, Yuichi Iikubo
  • Patent number: 7037412
    Abstract: The invention provides a method for producing purified N-vinyl-2-pyrrolidone free of odorous components. The method is composed of distilling with a distillation column a liquid, which is formed by adding to an odorous components-containing liquid having a N-vinyl-2-pyrrolidone purity of not lower than 90 wt %, a compound having boiling point lower than that of N-vinyl-2-pyrrolidone, and whereby removing the odorous components together with said low-temperature boiling compound as the distillate.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: May 2, 2006
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Kazuaki Abe, Takashi Yodoshi, Hitoshi Yano
  • Patent number: 6863780
    Abstract: There is provided an azeotropic mixture having 1,1,1,3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture of R-245fa and HF wherein the mixture of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride is subjected to a distillation step so that a distillate is obtained which has the azeotropic mixture of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride, and a bottom product is obtained which has separated/purified 1,1,1,3,3-pentafluoropropane or hydrogen fluoride.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: March 8, 2005
    Inventors: Tatsuo Nakada, Noriaki Shibata, Takashi Shibanuma
  • Patent number: 6849163
    Abstract: There is provided a process for recovering tetrafluoroethylene wherein an amount of energy required to obtain TFE is reduced.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: February 1, 2005
    Assignee: Daikin Industries, Ltd.
    Inventors: Shigeyuki Yoshii, Yukio Homoto
  • Patent number: 6794470
    Abstract: A tetrafluoroethylene polymer is produced by polymerizing tetrafluoroethylene in the presence of an aqueous medium and a polymerization initiator, wherein the content of impurities (e.g. a saturated compound such as CH2F2 or CHF3 and an unsaturated compound such as CF2═CFH, CF2═CH2, CF2═CFCl or CF2═CHCl) in the tetrafluoroethylene is not more than 100 ppm. By this method, PTFE which is uniform and stretchable at a high stretch ratio and which is excellent in the fibrillation property and has a high break strength, can be obtained.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: September 21, 2004
    Assignee: Asahi Glass Company, Limited
    Inventors: Shigeki Kobayashi, Jun Hoshikawa, Kazuo Kato, Hiroki Kamiya, Hiroyuki Hirai
  • Patent number: 6790319
    Abstract: A method for recovering a titanium compound includes bringing a waste solution containing a titanium alkoxide into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and then distilling the solution containing the titanium halide to recover the titanium halide from the solution, or the method includes distilling a waste solution containing a titanium alkoxide and a titanium halide to recover at least a part of the titanium halide from the waste solution, bringing a residue in a distiller after the distillation into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and distilling the solution containing the titanium halide to recover the titanium halide from the solution. The method can recover an increased amount of a titanium compound from a waste solution containing a titanium alkoxide.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: September 14, 2004
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Takumi Kitahara, Tetsuya Nakano
  • Publication number: 20040124076
    Abstract: A process for the purification of fluoromethyl hexafluoroisopropyl ether which involves contacting a crude composition fluoromethyl hexafluoroisopropyl ether and hexafluoroisopropyl alcohol with a modifier to modify the vapour pressure of the ether and/or the alcohol. The difference in vapour pressure of the ether and the alcohol increases relative to the difference in vapour pressure of the ether and alcohol in the absence of the modifier and enables separation of the ether from the alcohol. The modifier suitably is ammonia and/or an amine.
    Type: Application
    Filed: December 8, 2003
    Publication date: July 1, 2004
    Inventors: Andrew Paul Sharratt, Lee Colin Draper
  • Patent number: 6755942
    Abstract: The invention relates to azeotropic compositions of halogenated propanes with HF.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: June 29, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ralph Thomas Baker, Ralph Newton Miller, Viacheslav Alexandrovich Petrov, Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • Publication number: 20040073072
    Abstract: Prior to carrying out a gaseous phase chemical reaction, a liquid phase organic compound which is prone to degrade is vaporised at elevated pressures with the aid of a second compound. In one embodiment of the invention, vaporisation is effected by co-vaporising a mixture of the two compounds in a vaporiser. In another embodiment, the first compound is injected into a hot gaseous stream and undergoes atomisation into droplets which then vaporise within the gaseous stream. The second compound is used to assist the atomisation process and/or to sweep atomised droplets of the first compound away from hot surfaces where the first compound would otherwise tend to undergo degradation if the droplets are allowed to reside in contact with such surfaces.
    Type: Application
    Filed: July 18, 2003
    Publication date: April 15, 2004
    Inventors: John David Scott, Charles Brian Blake, Paul Nicholas Ewing, Jeremy Charles Bauser Hunns, Steven Toplis, Andrew Neil Irwin, Mark Spruce
  • Patent number: 6676809
    Abstract: Hydrogen fluoride is effectively removed from a mixture of hydrogen fluoride, dichloromethane, chlorofluoromethane and/or difluoromethane by distilling the mixture so that two-component azeotropic mixtures of hydrogen fluoride and dichloromethane, hydrogen fluoride and chlorofluoromethane and hydrogen fluoride and difluoromethane are removed, or by liquid-separating the mixture into an upper liquid phase rich in hydrogen fluoride and a lower liquid phase not rich in hydrogen fluoride before each liquid phase is distilled as described above.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: January 13, 2004
    Assignee: Daikin Industries Ltd.
    Inventors: Takehide Tsuda, Takeo Matsumoto, Yoshinori Tanaka, Satoshi Komatsu, Satoshi Koyama
  • Patent number: 6660130
    Abstract: Prior to carrying out a gaseous phase chemical reaction, a liquid phase organic compound which is prone to degrade is vaporized at elevated pressures with the aid of a second compound which together with the organic compound produces a mixture having a boiling point less than that of the organic compound. In one embodiment of the invention, vaporization is effected by co-vaporizing a mixture of the two compounds in a vaporiser. In another embodiment, the first compound is injected into a hot gaseous stream and undergoes atomization into droplets which then vaporize within the gaseous stream. The second compound is used to assist the atomization process and/or to sweep atomized droplets of the first compound away from hot surfaces where the first compound would otherwise tend to undergo degradation if the droplets are allowed to reside in contact with such surfaces.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: December 9, 2003
    Assignee: Ineos Fluor Holdings Limited
    Inventors: John David Scott, Charles Brian Blake, Paul Nicholas Ewing, Jeremy Charles Bauser Hunns, Steven Toplis, Andrew Neil Irwin, Mark Spruce
  • Patent number: 6649205
    Abstract: There is described a process for the extraction of at least one relatively polar component from a material which may be naturally occuring or a synthetic mixture, the process comprising the steps of: (a) contacting the material with a solvent mixture comprising a C1 to C4 fluorinated hydrocarbon, especially 1,1,1,2-tetrafluoroethane and a co-solvent having a dielectric constant (at 20° C.) of at least 5; and (b) separating the charged solvent from said material, thereby to isolate said material.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: November 18, 2003
    Assignee: Advanced Phytonics Limited
    Inventor: Mazin Nicola
  • Patent number: 6638987
    Abstract: This invention provides azeotrope-like compositions of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane-245fa and water that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents for polymer foam, heat transfer media, and gaseous dielectrics.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: October 28, 2003
    Assignee: Honeywell International, Inc.
    Inventors: Mary C. Bogdan, Gary M. Knopeck, Hang T. Pham, Rajiv R. Singh, David Dressel, David J. Williams
  • Patent number: 6635686
    Abstract: This invention provides azeotrope-like compositions of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane-245fa and 2-methylbutane that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents for polymer foam, heat transfer media, and gaseous dielectrics.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: October 21, 2003
    Assignee: Honeywell International Inc.
    Inventors: Mary C. Bogdan, Hang T. Pham, David J. Williams, Gary M. Knopeck, Rajiv R. Singh
  • Publication number: 20030164283
    Abstract: The present invention involves processes that utilize an olefinic compound, in particular, hexafluoropropene (HFP) or chlorotrifluoroethene (CFC-1113) as extracting agents in the purification of pentafluoroethane (HFC-125). These processes can utilize recovered HFP as a precursor for the production of heptafluoropropane (HFC-227) or other derivatives.
    Type: Application
    Filed: February 14, 2002
    Publication date: September 4, 2003
    Inventors: Stephan M. Brandstater, Mitchel Cohn, Victoria E. Hedrick, Yuichi Iikubo
  • Publication number: 20030121769
    Abstract: The invention relates to the purification of pentafluoroethane (F125) containing chloropentafluoroethane (F115) by liquid/liquid extraction or by extractive distillation.
    Type: Application
    Filed: September 16, 2002
    Publication date: July 3, 2003
    Inventors: Emmanuel Guiraud, Cathy Descamps
  • Patent number: 6572831
    Abstract: A material contaminated with a solvent is treated with a hydrofluorocarbon to remove the contaminant. The hydrofluorocarbon can be tetrafluoroethane.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: June 3, 2003
    Assignee: Advanced Phytonics Limited
    Inventor: Mazin Nicola
  • Patent number: 6548720
    Abstract: A process is disclosed for producing the pentfluropropenes of the formula CF3CX═CF2, where X is H or Cl. The process involves hydrodehalogenating CF3CCl2CF3 with hydrogen at an elevated temperature in the vapor phase over a catalyst comprising an elemental metal, metal oxide, metal halide and/or metal oxyhalide (the metal being copper, nickel, chromium and the halogen of said halides and said oxyhalides being fluorine and/or chlorine. Processes for producing the hydrofluorocarbons CF3CH2CHF2, CF3CHFCF3 and CF3CH2CF3 are also disclosed which involve (a) hydrodehalogenating CF3CCl2CF3 with the hydrogen as indicated above to produce a product comprising CF3CCl═CF2, CF3CH═CF2, HCl and HF; and (b) either reacting the CF3CCl═CF2 and/or CF3CH═CF2 produced in (a) in the vapor phase with hydrogen to produce CF3CH2CHF2, reacting CF3CCl═CF2 produced in (a) with HF to produce CF3CHFCF3, or reacting the CF3CH═CF2produced in (a) with HF to produce CF3CH2CF3.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: April 15, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: William H. Manogue, V. N. Mallikarjuna Rao, Allen Capron Sievert, Steven H. Swearingen
  • Patent number: 6527917
    Abstract: A method for efficiently separating pentafluoroethane (HFC-125) from a mixture thereof with chloropentafluoroethane (CFC-115). This method is performed by subjecting a mixture (2) of HFC-125 (6) and CFC-115 (4) to extractive distillation (1) to give highly concentrated HFC-125 (6). A hydrofluorocarbon compound (3) having two carbon atoms, particularly 1,1,1,2-tetrafluoroethane, is used as an extractant to obtain concentrated CFC-115 as a distillate and a mixture of HFC-125 having a reduced content of CFC-115 with the extractant as a bottom (5), the extractant being separated from HFC-124 in this mixture by distillation (9) and reused in the extractive distillation.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: March 4, 2003
    Assignee: Daikin Industries Ltd.
    Inventors: Satoru Kohno, Takashi Shibanuma
  • Publication number: 20030010618
    Abstract: A method for separating difluoromethane from a mixture of said difluoromethane and at least one impurity, said method comprising extractively distilling said mixture using dichloromethane as the extractive agent to recover a product stream of purified difluoromethane having a concentration of said impurity lower than that of said mixture.
    Type: Application
    Filed: March 23, 2001
    Publication date: January 16, 2003
    Inventor: Paul G. Clemmer
  • Patent number: 6488817
    Abstract: A process for the purification of difluoromethane comprising: (a) subjecting a mixture comprising at least difluoromethane (HFC-32) and dichlorodifluoromethane (CFC-12) to a first distillation step in which a majority of either CFC-12 or HFC-32 is concentrated in a first distillate and a majority of the other component is concentrated in a first bottoms; and (b) subjecting the first distillate in step (a) to at least one additional second distillation step conducted at a different pressure in which a majority of the component concentrated in said first distillate is concentrated in a second bottoms and in which the other component is concentrated in a second distillate; and (c) recovering purified HFC-32 from one of said first or second bottoms.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: December 3, 2002
    Assignee: AlliedSignal Inc.
    Inventors: Charles Francis Swain, Rajiv Ratna Singh, Hang Thanh Pham
  • Patent number: 6458249
    Abstract: Nitrogen trifluoride (NF3) containing less than 10 parts-per-million molar impurities, e.g., tetrafluoromethane (PFC-14), is disclosed. Azeotropic and extractive distillation processes using entraining agents for separating NF3 and PFC-14 from each other and from mixtures with other electronics industry materials are disclosed.
    Type: Grant
    Filed: November 9, 1998
    Date of Patent: October 1, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ralph Newton Miller, Chien-Ping Chai Kao, Barry Asher Mahler