Purification Or Recovery Patents (Class 570/262)
  • Patent number: 9126885
    Abstract: To provide a method for purifying R-1234yf, whereby it is possible to efficiently remove even impurities such as R-1243zf, etc. which are difficult to separate by distillation purification, from a mixture containing R-1234yf as the main component and various impurities, such as a gas formed by reacting R-1214ya with hydrogen. The method for purifying R-1234yf comprises a step of bringing a mixture which contains R-1234yf as the main component and also contains hydrohaloalkene impurities other than R-1234yf and hydrohaloalkane impurities, into contact with a solvent that has an extraction/removal index (r), as represented by the formula r=[4×(?D?17.2)2+(?P?8.3)2+(?H?2.6)2]1/2, of at most 6.5, so as to remove at least a part of the hydrohaloalkene impurities and hydrohaloalkane impurities.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: September 8, 2015
    Assignee: Asahi Glass Company, Limited
    Inventors: Kazuyoshi Kurashima, Kunio Watanabe, Hiroshi Yamamoto
  • Patent number: 9000243
    Abstract: The present invention relates to a process for separating chlorinated methanes utilizing a dividing wall column. Processes and manufacturing assemblies for generating chlorinated methanes are also provided, as are processes for producing products utilizing the chlorinated methanes produced and/or separated utilizing the present process(es) and/or assemblies.
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: April 7, 2015
    Assignee: Dow Global Technologies LLC
    Inventors: John G Pendergast, Jr., William S. White, Anthony R. Avilla, Thomas U Luebbe
  • Patent number: 8987536
    Abstract: The present disclosure relates to processes for reducing the concentration of RfC?CX impurities in fluoroolefins. The process involves: contacting a mixture comprising at least one fluoroolefin and at least one RfC?CX impurity with at least one amine to reduce the concentration of the at least one RfC?CX impurity in the mixture; wherein Rf is a perfluorinated alkyl group, and X is H, F, Cl, Br or I. The present disclosure also relates to processes for making at least one hydrotetrafluoropropene product selected from the group consisting of CF3CF?CH2, CF3CH?CHF, and mixtures thereof and reducing the concentration of CF3C?CH impurity generated during the process. The present disclosure also relates to processes for making at least one hydrochlorotrifluoropropene product selected from the group consisting of CF3CCl?CH2, CF3CH?CHCl, and mixtures thereof and reducing the concentration of CF3C?CH impurity generated during the process.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: March 24, 2015
    Assignee: E I du Pont de Nemours and Company
    Inventors: Xuehui Sun, Mario Joseph Nappa
  • Publication number: 20150047682
    Abstract: A dewaxing device and a method of recycling chemical solvent used by the dewaxing device are shown. The dewaxing device includes a dewaxing system and a recycling system. The dewaxing system includes a rinsing device and a storage device connected with the rinsing device via a circulation pipe. The recycling system includes a cooling equipment connected with the storage device for cooling mixed solution with wax from the storage device to precipitate wax out of the mixed solution, a filter equipment connected with the cooling equipment for filtering out the precipitated wax, and a recycling trough connected between the filter equipment and the storage device for containing the filtered solution passing through the filter equipment and further conveying the filtered solution back into the storage device to be reused.
    Type: Application
    Filed: August 19, 2013
    Publication date: February 19, 2015
    Applicant: Cheng Uei Precision Industry Co., Ltd.
    Inventors: CHENG YU CHOU, CHI-JU SU, CHENG AN CHIANG, CHIH WEI CHENG
  • Publication number: 20150008357
    Abstract: To provide a method for efficiently separating 2,3,3,3-tetrafluoropropene (HFO-1234yf) and chloromethane (R40) from a composition comprising HFO-1234yf and R40. An azeotrope-like composition comprising from 58 to 78 mol % of HFO-1234yf and from 22 to 42 mol % of R40, and a method for producing HFO-1234yf, which comprises steps of distilling an initial mixture containing HFO-1234yf in a content exceeding 63 mol % in the total amount of HFO-1234yf and R40, thereby to separate the initial mixture into a first fraction in which the content of HFO-1234yf in the total amount of HFO-1234yf and R40 is lower than the content of HFO-1234yf in the total amount of HFO-1234yf and R40 in the initial mixture, and a second fraction in which the content of HFO-1234yf in the total amount of HFO-1234yf and R40 is higher than the content of HFO-1234yf in the total amount of HFO-1234yf and R40 in the initial mixture, and then obtaining HFO-1234yf having a reduced R40 concentration, from the second fraction.
    Type: Application
    Filed: September 26, 2014
    Publication date: January 8, 2015
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Shoji Furuta, Tetsuo Otsuka
  • Publication number: 20140336426
    Abstract: Disclosed is a process and apparatus for heat recovery in vinyl chloride monomer manufacturing plants or in integrated vinyl chloride monomer/polyvinyl chloride manufacturing plants. A process for capture and use of excess heat recovered in the production of vinyl chloride includes distillatively purifying DCE in a high-boilers column, using a heat exchanger to capture thermal energy from a purified DCE vapor stream from the high-boilers column, generating low pressure steam from the captured thermal energy, returning condensed DCE vapors to the high-boilers column, and heating parts of the plant with the generated low pressure steam.
    Type: Application
    Filed: November 15, 2012
    Publication date: November 13, 2014
    Applicants: VINNOLIT GMBH & CO. KG, THYSSENKRUPP INDUSTRIAL SOLUTIONS AG
    Inventors: Michael Benje, Peter Kammerhofer
  • Publication number: 20140275662
    Abstract: This invention relates to a process for the suppression of 3,3,3-trifluoropropyne during the manufacture of fluorocarbons, fluoroolefins, hydrochlorofluoroolefins. More particularly, this invention is directed to a process to suppress the formation of 3,3,3-trifluoropropyne during processes for the manufacture of HCFO-1233zd(E), HCFO-1233zd(Z), HFO-1234ze(E), and/or HFO-1234ze(Z).
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: Haluk Kopkalli, Jeffrey A. Ball, Yuon Chiu, Hsueh Sung Tung, Konstantin A. Pokrovski, Daniel C. Merkel
  • Publication number: 20140238870
    Abstract: A method is provided of regenerating solvents used to remove gaseous contaminants from gaseous mixtures of various compositions with significantly reduced energy required, where one exemplary method includes directing a solution with the solvents and the preferentially absorbed and/or dissolved gaseous contaminants through a filter comprising a membrane having pre-determined diffusion rates so that a substantial portion of the gaseous contaminants pass through the filter, permitting the passage of the gaseous contaminants through the membrane for further processing, and recirculating the separated solvent so that it may be used again to remove new gaseous contaminants. In some cases, it may be desired to permit some of the solvent to pass through the membrane along with the gaseous contaminant.
    Type: Application
    Filed: May 6, 2014
    Publication date: August 28, 2014
    Inventor: Subramanian Iyer
  • Patent number: 8779220
    Abstract: A method for capturing certain fluorinated vinyl monomers from a gaseous mixture using ionic liquids is described. The gaseous mixture is contacted with at least one ionic liquid, whereby at least a portion of the fluorinated vinyl monomer is absorbed by the ionic liquid. The method is useful for reducing emissions of fluorinated vinyl monomers and for increasing the product yields in the manufacture of polymers from these monomers.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: July 15, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Charles Joseph Noelke, Mark Brandon Shiflett
  • Publication number: 20140113811
    Abstract: Provided are methods for storing gases on porous adsorbents, methods for optimizing the storage of gases on porous adsorbents, methods of making porous adsorbents, and methods of gas storage of optimized compositions, as in systems containing porous adsorbents and gas adsorbed on the surface of the porous adsorbent. The disclosed methods and systems feature a constant or increasing isosteric enthalpy of adsorption as a function of uptake of the gas onto the exposed surface of a porous adsorbent. Adsorbents with a porous geometry and surface dimensions suited to a particular adsorbate are exposed to the gas at elevated pressures in the specific regime where n/V (density) is larger than predicted by the ideal gas law by more than several percent.
    Type: Application
    Filed: October 10, 2013
    Publication date: April 24, 2014
    Inventors: Nicholas P. STADIE, Brent T. FULTZ, Channing AHN, Maxwell MURIALDO
  • 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
  • Patent number: 8609909
    Abstract: Processes for the preparation and purification of hydrofluoroolefins such as tetrafluorinated propenes. A process is provided for separating a first hydrofluoroolefin from a second hydrofluoroolefin by a) providing a mixture including a first hydrofluoroolefin and a second hydrofluoroolefin, which first hydrofluoroolefin is preferentially more reactive with an amine than the second hydrofluoroolefin; b) adding a sufficient amount of an amine to the mixture to form a combination including the second hydrofluoroolefin and a reaction product of the first hydrofluoroolefin and the amine; and then c) separating the reaction product from the combination. This is particularly useful for removing 1,2,3,3,3-pentafluoropropene (HFO-1225ye) impurities from the hydrofluoroolefin 2,3,3,3-tetrafluoropropene (HFO-1234yf). HFO-1234yf is a refrigerant with low global warming potential.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: December 17, 2013
    Assignee: Honeywell International Inc.
    Inventors: Ryan Hulse, Rajiv Ratna Singh, Ian Shankland, Michael Van Der Puy
  • Patent number: 8492598
    Abstract: Methods are provided for removing impurities from compositions comprising alkyl bromide. Such methods comprise combining such composition with at least one nonvolatile epoxide during distillation to purify the alkyl bromide. Ultra pure alkyl bromide compositions are also provided.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: July 23, 2013
    Assignee: Albemarle Corporation
    Inventors: William B. Harrod, Dru J. Manuel, Keith G. Anderson, Aaron C. Williams, Kimberly A. Maxwell
  • Patent number: 8242317
    Abstract: Recovery of a halogenated hydrocarbon is performed by removing the halogenated hydrocarbon from an accompanying gas and/or temporarily storing the halogenated hydrocarbon on sorption filters, and releasing the halogenated hydrocarbon in targeted manner. The halogenated hydrocarbon serves for removal of an expiration gas using a steam carrier. A flow of the halogenated hydrocarbon takes place through two sorbents, (1) a hydrophobic carbon molecular sieve and (2) a hydrophobic zeolite, in two sorbent beds, spatially following one another. Air mixed with steam or steam has a temperature of the gases between 90° C. and 100° C. at normal pressure. In a filter for carrying out theabove recovery method, two filter beds are disposed to spatially follow one another.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: August 14, 2012
    Assignee: ZeoSys GmbH
    Inventor: Helmut Stach
  • Patent number: 8153849
    Abstract: Methods of recovering a triarylmethyl halide from a sucrose derivatization process include the steps of (a) forming a mixture including 1) a triarylmethylated sucrose derivative including at least one triarylmethyl substituent and at least one acyl substituent on the sucrose, 2) triarylmethylated sucrose ester byproducts, and 3) an amine; (b) separating from the output of step (a) i) the triarylmethylated sucrose derivative, and ii) a mixture including the triarylmethylated sucrose ester byproducts and the amine; (c) removing the amine from the mixture of step (b) ii); (d) contacting the product of step (c) with hydrogen halide to cleave triarylmethyl groups and thereby form a crude triarylmethyl halide component; (e) contacting the crude triarylmethyl halide component with hydrogen halide to form a purified triarylmethyl halide component; and (f) recovering the triarylmethyl halide from the output of step (e).
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: April 10, 2012
    Assignee: Tate & Lyle Technology Ltd.
    Inventors: Stephen C. Scherrer, Anne P. Noonan, Thomas K. Hutton
  • Patent number: 8118995
    Abstract: A method for inhibiting the formation of fouling materials including contacting hydrocarbon media containing aldehyde compounds with an antifoulant while treating the hydrocarbon media with a basic wash. The antifoulant includes a reducing sugar.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: February 21, 2012
    Assignee: General Electric Company
    Inventors: Mary King, Cato Russell McDaniel
  • Patent number: 8119846
    Abstract: Described is a process for separating an organic phase comprising mainly propyl bromide from a crude reaction mixture formed by free-radical catalyzed hydrobromination of propylene with hydrogen bromide. The process comprises (A) feeding cold water into an upper or mid-portion of a packed column; (B) concurrently feeding the crude reaction mixture into an upper portion and/or mid-portion of the column so that the water contacts the crude reaction mixture; to form a mixture of (i) an acidic aqueous phase comprising aqueous hydrogen bromide and (ii) an organic phase comprising propyl bromide; (C) withdrawing the resultant phases from said column, at a rate comparable to the feeds being made into the column; and (D) separating the phases to form an upper acidic aqueous phase comprising aqueous hydrogen bromide superposed on a lower liquid organic phase comprising propyl bromide, and separating these upper and lower phases from each other.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: February 21, 2012
    Assignee: Albemarle Corporation
    Inventors: Alvin E. Harkins, Jr., James E. Torres, Keith G. Anderson
  • Publication number: 20110313217
    Abstract: The invention is a method of removing methyl iodide from an alkane distillation bottoms stream of an acetic acid production process. The method comprises contacting the alkane distillation bottoms stream in the liquid phase with a phosphine or a phosphine-functionalized support, and recovering a treated alkane distillation bottoms stream having a reduced methyl iodide content.
    Type: Application
    Filed: June 17, 2010
    Publication date: December 22, 2011
    Inventors: Noel C. Hallinan, Brian A. Salisbury, Wayne J. Brtko
  • Publication number: 20110257445
    Abstract: The present invention relates to a process for separating chlorinated methanes utilizing a dividing wall column. Processes and manufacturing assemblies for generating chlorinated methanes are also provided, as are processes for producing products utilizing the chlorinated methanes produced and/or separated utilizing the present process(es) and/or assemblies.
    Type: Application
    Filed: April 19, 2011
    Publication date: October 20, 2011
    Applicant: DOW GLOBAL TECHNOLOGIES LLC
    Inventors: John G. Pendergast, JR., William S. White, Anthony R. Avilla, Thomas U. Luebbe
  • Patent number: 7968745
    Abstract: A process for the manufacture of iodixanol by performing a purification process of the crude product in a solvent comprising n-propanol. The crude product may be obtained in aqueous solution from dimerization of 5-acetamido-N,N?-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide (“Compound A”).
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: June 28, 2011
    Assignee: GE Healthcare AS
    Inventor: Ole Magne Homestad
  • Publication number: 20110112342
    Abstract: Methods are provided for removing impurities from compositions comprising alkyl bromide. Such methods comprise combining such composition with at least one nonvolatile epoxide during distillation to purify the alkyl bromide. Ultra pure alkyl bromide compositions are also provided.
    Type: Application
    Filed: August 28, 2008
    Publication date: May 12, 2011
    Applicant: Albemarle Corporation
    Inventors: William B. Harrod, Dru J. Manuel, Keith G. Anderson, Aaron C. Williams, Kimberly A. Maxwell
  • Patent number: 7939698
    Abstract: The present invention relates to a process for Grignard type reactions comprising mixing at least two fluids in a microreactor having at least two injection points.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: May 10, 2011
    Assignee: Lonza AG
    Inventors: Dominique Roberge, Nikolaus Bieler, Laurent Ducry
  • Publication number: 20100331584
    Abstract: Recovery of a halogenated hydrocarbon is performed by removing the halogenated hydrocarbon from an accompanying gas and/or temporarily storing the halogenated hydrocarbon on sorption filters, and releasing the halogenated hydrocarbon in targeted manner. The halogenated hydrocarbon serves for removal of an expiration gas using a steam carrier. A flow of the halogenated hydrocarbon takes place through two sorbents, (1) a hydrophobic carbon molecular sieve and (2) a hydrophobic zeolite, in two sorbent beds, spatially following one another. Air mixed with steam or steam has a temperature of the gases between 90° C. and 100° C. at normal pressure. In a filter for carrying out theabove recovery method, two filter beds are disposed to spatially follow one another.
    Type: Application
    Filed: July 2, 2010
    Publication date: December 30, 2010
    Applicant: ZeoSys GmbH
    Inventor: Helmut Stach
  • Publication number: 20100228061
    Abstract: The invention relates to a catalyst for the removal of detrimental halogenated and non-halogenated hydrocarbons in different effluent or process gases. The invention also relates to a method for the manufacture and use of such a catalyst. The catalyst of the invention includes a porous support material, on the surface of which there are one or several noble metals, V, and one or several 1. additives chosen from the group of Cr, Mn, Fe, Co and Ni.
    Type: Application
    Filed: July 22, 2008
    Publication date: September 9, 2010
    Applicant: ECOCAT OY
    Inventors: Matti Harkonen, Teuvo Maunula, Jukka Saartoala
  • Publication number: 20100181186
    Abstract: The invention consequently relates, in one aspect, to a process for obtaining a hydrofluoroalkane comprising at least two carbon atoms, which is purified of unsaturated organic impurities, according to which the hydrofluoroalkane containing organic impurities including (chloro)fluoro olefins is subjected to at least one purification treatment with bromine or BrCl, preferably in the presence of, an initiator. The process is suitable, for example, to purify 1,1,1,2-tetrafluoroethane. A further aspect concerns the application of LEDs or OLEDs to support chemical reactions of the gas-gas, liquid-liquid or gas-liquid type, and a respective reactor.
    Type: Application
    Filed: July 16, 2008
    Publication date: July 22, 2010
    Applicant: SOLVAY FLUOR GMBH
    Inventors: Ercan Uenveren, Eckhard Hausmann, Johannes Eicher, Kerstin Eichholz
  • Publication number: 20100150812
    Abstract: Systems and processes are provided that relate to the recovery of sorbates in processes utilizing temperature controlled adsorption. Sorbate recovery can include providing a temperature controlled adsorber that is undergoing a regeneration cycle after undergoing an adsorption cycle. The temperature controlled adsorber can have one or more adsorption flow passages and one or more heat transfer flow passages. The one or more adsorption flow passages can contain an adsorptive material coating with a sorbate adsorbed thereto. A heating fluid can be provided to the one or more heat transfer flow passages of the temperature controlled adsorber. A regeneration stream can be provided to the one or more adsorption flow passages of the temperature controlled adsorber. The adsorptive material coating can be regenerated by removing the sorbate from the temperature controlled adsorber to produce a regeneration effluent stream.
    Type: Application
    Filed: September 8, 2009
    Publication date: June 17, 2010
    Applicant: UOP LLC
    Inventors: Stephen R. Dunne, David A. Wegerer
  • Publication number: 20090270663
    Abstract: The present invention relates to a process for Grignard type reactions comprising mixing at least two fluids in a microreactor having at least two injection points.
    Type: Application
    Filed: July 11, 2007
    Publication date: October 29, 2009
    Applicant: LONZA AG
    Inventors: Dominique Roberge, Nikolaus Bieler, Laurent Ducry
  • Publication number: 20090240091
    Abstract: Described is a process for separating an organic phase comprising mainly propyl bromide from a crude reaction mixture formed by free-radical catalyzed hydrobromination of propylene with hydrogen bromide. The process comprises (A) feeding cold water into an upper or mid-portion of a packed column; (B) concurrently feeding the crude reaction mixture into an upper portion and/or mid-portion of the column so that the water contacts the crude reaction mixture; to form a mixture of (i) an acidic aqueous phase comprising aqueous hydrogen bromide and (ii) an organic phase comprising propyl bromide; (C) withdrawing the resultant phases from said column, at a rate comparable to the feeds being made into the column; and (D) separating the phases to form an upper acidic aqueous phase comprising aqueous hydrogen bromide superposed on a lower liquid organic phase comprising propyl bromide, and separating these upper and lower phases from each other.
    Type: Application
    Filed: June 1, 2007
    Publication date: September 24, 2009
    Applicant: ALBEMARLE CORPORATION
    Inventors: Alvin E. Harkins, JR., Keith G. Anderson, James E. Torres
  • Publication number: 20080318829
    Abstract: A process for oxygen-initiated hydrobromination of propene to form a crude reaction mixture of 95 GC area % n-propyl bromide. The process includes feeding an oxygen-containing gas, propene and hydrogen bromide into a liquid phase mixture comprised of n-propyl bromide and hydrogen bromide. At least the oxygen-containing gas and the propene of the feed are fed subsurface to the liquid phase mixture and either (a) the oxygen-containing gas and the propene do not come together in the absence of hydrogen bromide or (b) the oxygen-containing gas and the propene come together only in a propene:oxygen molar ratio in the range of 145:1 to 180:1. Purification processes provide a propyl bromide product containing at least 99.7 GC area % n-propyl bromide. Also provided is a novel composition of enhanced thermal stability which comprises a mixture of n-propyl bromide and isopropyl bromide. The mixture has an n-propyl bromide content of at least 99.7 GC area %, and an isopropyl bromide content of no more than 0.
    Type: Application
    Filed: April 13, 2006
    Publication date: December 25, 2008
    Applicant: ALBEMARLE CORPORATION
    Inventors: William B. Harrod, Bonnie G. McKinnie, Alireza M. Dadgar, Tyson J. Hall
  • Publication number: 20080293979
    Abstract: Sulfuric acid contaminated with byproducts of chloromethane scrubbing is regenerated for reuse in the scrubbing process by diluting with water to not lower than about a 55 weight percent concentration, heating the diluted acid to boiling at not more than about 135° C., concentrating the acid to a concentration of minimally 80 weight percent at a temperature of at least 170° C., and reacting the concentrated acid with an oxidizing agent.
    Type: Application
    Filed: October 6, 2006
    Publication date: November 27, 2008
    Applicant: WACKER CHEMIE AG
    Inventors: Klaus Kaeppler, Reinhold Iretzberger, Gerhard Nagy
  • Publication number: 20080234526
    Abstract: Methods of recovering a triarylmethyl halide from a sucrose derivatization process include the steps of (a) forming a mixture including 1) a triarylmethylated sucrose derivative including at least one triarylmethyl substituent and at least one acyl substituent on the sucralose, 2) triarylmethylated sucrose ester byproducts, and 3) an amine; (b) separating from the output of step (a) i) the triarylmethylated sucrose derivative, and ii) a mixture including the triarylmethylated sucrose ester byproducts and the amine; (c) removing the amine from the mixture of step (b) ii); (d) contacting the product of step (c) with hydrogen halide to cleave triarylmethyl groups and thereby form a crude triarylmethyl halide component; (e) contacting the crude triarylmethyl halide component with hydrogen halide to form a purified triarylmethyl halide component; and (f) recovering the triarylmethyl halide from the output of step (e).
    Type: Application
    Filed: December 4, 2007
    Publication date: September 25, 2008
    Inventors: Stephen C. Scherrer, Anne P. Noonan, Thomas K. Hutton
  • Publication number: 20080194451
    Abstract: This invention provides a process which comprises mixing permanganate with a 1-bromopropane product mixture to form a permanganate-containing 1-bromopropane product mixture, and recovering a purified 1-bromopropane product from said permanganate-containing 1-bromopropane product mixture. This invention also provides a process for preparing a 1-bromopropane product mixture from 1-propanol and hydrogen bromide, characterized by mixing permanganate with the 1-bromopropane product mixture to form a permanganate-containing 1-bromopropane product mixture and recovering a purified 1-bromopropane product from said permanganate-containing 1-bromopropane product mixture.
    Type: Application
    Filed: May 1, 2006
    Publication date: August 14, 2008
    Applicant: ALBEMARLE CORPORATION
    Inventors: Vincent Luc Mutterer, Jean-Philippe Tritz
  • Patent number: 7405334
    Abstract: The present invention relates to processes for reducing the concentration of acidic impurities HF, HCl, HBr, HI, HNO3 and H2SO4 in fluorinated hydrocarbons. The process involves: (i) contacting the fluorinated hydrocarbon with a phosphorous oxyacid salt, and (ii) recovering the fluorinated hydrocarbon having reduced concentration of, or substantially free of, said acidic contaminant, provided that said fluorinated hydrocarbon is not CF3CH2CF3 or CF3CHFCF3.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: July 29, 2008
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Allen C. Sievert
  • Publication number: 20080091053
    Abstract: A process for the manufacture of haloalkanes, or more particularly to a process for the manufacture of 1,1,1,3,3-pentachloropropane (HCC-240fa) and/or and/or 1,1,1,3-tetrachloropropane (HCC-250fb). The process includes (a) mixing a catalyst, co-catalyst and a haloalkane starting material under conditions suitable to produce a homogeneous mixture; (b) reacting the homogeneous mixture with a haloalkene and/or alkene starting material under conditions suitable to produce a haloalkane product stream; and (c) recovering a haloalkane product from said product stream.
    Type: Application
    Filed: October 9, 2007
    Publication date: April 17, 2008
    Inventors: Hsueh Sung Tung, Ian Shankland
  • Patent number: 7291757
    Abstract: The invention relates to a method for the production of 1,2-dichloroethane by direct chlorination using chlorine and ethene in which, despite low reaction temperatures during direct chlorination, reaction heat produced is nevertheless used. According to the invention, vaporous 1,2-dichloroethane obtained in the direct chlorination reactor is compressed and the compressed 1,2-dichloroethane is transported to heat exchangers whereby heat is given off by the 1,2-dichloroethane. The invention also relates directly after the direct chlorination reactor.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: November 6, 2007
    Assignee: UHDE GmbH
    Inventor: Joachim Motz
  • Patent number: 7182840
    Abstract: The invention relates to a method and a device for the optimal use of reaction heat resulting from the production of 1,2-dichloroethane from ethene and chlorine. The aim of the invention is achieved by extracting reaction heat liberated during the reaction of chlorine with ethene and the reaction heat contained in 1,2-dichloroethane. Extraction of said reaction heat from the reaction chamber occurs using at least one part of gaseous 1,2-dichloroethane (latent heat) and at least one part of liquid 1,2-dichloroethane (feelable heat) removed from the reaction chamber. Said reaction heat is used to heat two fractioning columns in order to purify 1,2-dichloroethane of impurities having a boiling point higher than 1,2-dichloroethane.
    Type: Grant
    Filed: October 28, 2000
    Date of Patent: February 27, 2007
    Assignee: UHDE GmbH
    Inventors: Michael Benje, Peter Porscha, Stefan Von Egelstein
  • Patent number: 7163606
    Abstract: A system for recovering methylene chloride from an aqueous waste stream is disclosed. The system includes a distillation unit, at least one heat transfer unit, receptacles for methylene chloride and waste product, a temperature probe and a controller configured to selectively divert product flow from the distillation unit to either of the receptacles or to a recycle line back to the distillation unit depending upon the temperature measured by the probe. Also disclosed is a related process of recovering methylene chloride with such a system.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: January 16, 2007
    Assignee: Xerox Corporation
    Inventors: Thomas B. Glenwright, Warren R. Smith, Betsy B. Dodge, Steven P. Wazenkewitz, Ronald L. Swift
  • Patent number: 7132579
    Abstract: A method for chlorine purification in which crude chlorine containing nitrogen and/or oxygen is purified to separate the nitrogen and oxygen from the chloride, characterized in that the crude chlorine containing nitrogen and/or oxygen is contacted with 1,2-dichloroethane to cause the 1,2-dichloroethane to absorb the chlorine contained in the crude chlorine, and a process for producing 1,2-dichloroethane which comprises reacting ethylene with the chlorine contained in the chlorine containing 1,2-dichloroethane.
    Type: Grant
    Filed: June 20, 2002
    Date of Patent: November 7, 2006
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Noriaki Oku, Tateo Seo, Kiyoshi Iwanaga
  • Patent number: 7112709
    Abstract: A method for recovering much of the carbon and chlorine value in the heavy ends and other undesired by-products formed during the production of a C3 or higher polychlorinated alkane through the reaction of carbon tetrachloride with an olefine or chlorinated olefine, the improvement comprising the step of first separating the heavy ends and any other higher or lower boiling chlorohydrocarbon impurities from most of the desired product, and subjecting the separated heavy ends and impurities therewith to a high temperature exhaustive chlorination to produce carbon tetrachloride, tetrachloroethene, and minor amounts of hexachlorobutadiene and hexachlorobenzene by-products.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: September 26, 2006
    Assignee: Vulcan Chemicals
    Inventor: Rodney L. Klausmeyer
  • Patent number: 7045668
    Abstract: A process for production of high-purity hexafluoroethane, wherein a mixed gas containing hexafluoroethane and chlorotrifluoromethane is reacted with hydrogen fluoride in a gas phase in the presence of a fluorination catalyst at 200-450° C., for fluorination of the chlorotrifluoromethane, or wherein pentafluoroethane containing chlorine compounds with 1-3 carbon atoms is reacted with hydrogen in a gas phase in the presence of a hydrogenation catalyst at 150-400° C., and the product is then reacted with fluorine in a gas phase in the presence of a diluent gas.
    Type: Grant
    Filed: August 6, 2002
    Date of Patent: May 16, 2006
    Assignee: Showa Denko K.K.
    Inventors: Hiromoto Ohno, Toshio Ohi
  • Patent number: 6956143
    Abstract: The invention relates to a process and a device for the dissolution of salt that is hardly soluble, especially sodium chloride and other poorly soluble salts in 1,2 dichloroethane, which primarily are to be used in direct chlorination plants for the production of 1,2 dichloroethane. This aim is achieved by mounting an ultrasonic transducer (sonotrode) in the dissolution chamber which is filled with a suspension of salt crystals and 1,2 dichloroethane. The suspension is sent through a filter upon dissolution of the salt.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: October 18, 2005
    Assignee: Uhde GmbH
    Inventor: Michael Benje
  • Patent number: 6844474
    Abstract: The present invention provides a vapor phase process for the production of difluoromethane, HFC-32. The process of this invention provides for the preparation of HFC-32 by a process that exhibits both good product yield and selectivity.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: January 18, 2005
    Assignee: Allied Signal Inc.
    Inventors: Paul Gene Clemmer, Addison Miles Smith, Hsueh Sung Tung, John Stephen Bass
  • Patent number: 6787678
    Abstract: Disclosed are improved fluorination processes and fluorine-containing compositions which involve introducing to one or more fluorination process compositions a water reactive agent in an amount and under conditions effective to decrease the amount of water in that composition. The water reactive agent is preferably introduced to the fluorination process at a location downstream of the fluorination reaction, in amounts and under conditions effective to produce a relatively lower concentration of water in the composition, and preferably throughout the fluorination process.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: September 7, 2004
    Assignee: Honeywell International Inc.
    Inventors: Hsueh Sung Tung, Jason T. Stuck
  • Patent number: 6646171
    Abstract: A process for the crystallisation of a sterically hindered organic compound from a saturated or supersaturated solution of said compound in a solvent therefor, characterised in that crystallisation is effected under elevated pressure at a temperature above the boiling point of said solution at atmospheric pressure and up to the boiling point of said solution at said elevated pressure.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: November 11, 2003
    Assignee: Amersham Health AS
    Inventor: Jan Cervenka
  • Publication number: 20030199716
    Abstract: A process for economically producing 1,1,1,3,3-pentachloropropane under conditions which preserve the activity of the catalyst. In a preferred embodiment, a two-stage distillation process is employed. In the two-stage process, the size of the equipment, temperature and vacuum are varied.
    Type: Application
    Filed: April 17, 2002
    Publication date: October 23, 2003
    Applicant: VULCAN CHEMICALS DIVISION OF VULCAN MATERIALS COMPANY
    Inventors: Richard L. Wilson, John L. Dawkins, Rodney L. Klausmeyer, James J. Weller
  • Publication number: 20030149316
    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: Application
    Filed: December 3, 2002
    Publication date: August 7, 2003
    Inventors: Eric L. Mainz, Richard L. Wilson
  • Patent number: 6589444
    Abstract: The present invention relates to novel compositions of drying agents of superabsorbent polymers, molecular sieves and mixtures thereof and binders of polyurethane foam, polyisocyanurate foam and supports comprising cellulose and a method for separating, drying and/or filtering chemical mixtures. The composition and method of the invention have broad applicability. They may be used for example to remove water from chemical mixtures like refrigerants (e.g., in vehicular refrigeration systems), air (e.g., in vehicular braking systems), natural gas and cleaning solvents (e.g., used in semiconductor manufacture and pipeline cleaning).
    Type: Grant
    Filed: April 4, 2001
    Date of Patent: July 8, 2003
    Assignee: Honeywell International Inc.
    Inventors: Raymond Hilton Percival Thomas, Roy Philip Robinson, David John Williams, Peter Brian Logsdon
  • 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: 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: 6423189
    Abstract: A process for the preparation of 1,3-dichloropropane by reacting bis(3-hydroxypropyl)ether with hydrogen chloride, optionally in the presence of tertiary basic nitrogen compounds or other tertiary aliphatic bases as catalysts, distilling off the 1,3-dichloropropane and the water of reaction and working up the two phases.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: July 23, 2002
    Assignee: Degussa AG
    Inventor: Manfred Kaufhold