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| Number | Title | Issue Date |
| 7875752 | Recovery method for catalysts, reagents and co-products The present invention provides a method for conducting a chemical reaction in a non-fluorous medium using a fluorous compound in the presence of a solid adsorbant containing a fluorous domain and at least one chemical reactant, comprising contacting the fluorous com... | 01/25/2011 |
| 7750195 | Process for obtaining a purified hydrofluoroalkane Process for obtaining a hydrofluoroalkane which is purified of organic impurities, according to which the hydrofluoroalkane containing organic impurities is subjected to at least one purification treatment chosen from (a) a treatment with chlorine in th... | 07/06/2010 |
| 7696392 | Purification method of 1,1-difluoroethane Crude 1,1-difluoroethane containing at least one compound selected from the group consisting of unsaturated compounds each having two carbon atoms within the molecule and saturated chlorine-containing compounds each having two carbon atoms within the molecule is bro... | 04/13/2010 |
| 7384519 | Process for the purification of pharmaceutical grade HFC-134a and polymer grade HCFC-22 A method for the purification of pharmaceutical grade 1,1,1,2-tetrafluoroethane (HFC-134a) and polymer grade chlorodifluoromethane (HCFC-22) by contacting a mixture containing 1,1,1,2-tetrafluoroethane or chlorodifluoromethane and methyl chloride with a zeoli... | 06/10/2008 |
| 7335805 | Processes for purifying reaction products and processes for separating chlorofluorinated compounds Methods and materials are provided for the production of essentially isomerically pure perhalogenated and partially halogenated compounds. One embodiment of the present invention provides a process for the production of essentially isomerically pure CFC-216aa. Other... | 02/26/2008 |
| 7273512 | Process for drying difluoromethane Process for drying wet F32, which comprises placing a stream of the said F32 in continuous contact with a feed stock of a composition comprising a molecular sieve chosen from a 3A type sieve, at a temperature of between 5 and 78° C. and at a pressure of between 0.5... | 09/25/2007 |
| 7247759 | Fluorination reactor Fluorination reactions in which an organic compound to be fluorinated is contacted with elemental fluorine and HF is produced as a byproduct are disclosed, wherein the elemental fluorine is contacted with the organic compound in the presence of a fluoride-adsorbing ... | 07/24/2007 |
| 7230146 | Process for producing fluoropropenes Dehydrohalogenation processes for the preparation of fluoropropenes from corresponding halopropanes, in which the fluoropropenes have the formula CF3CY═CXNHP, wherein X and Y are independently hydrogen or a halogen selected from fl... | 06/12/2007 |
| 7179949 | Process for obtaining a purified hydrofluoroalkane Process for obtaining a hydrofluoroalkane which is purified of organic impurities, according to which the hydrofluoroalkane containing organic impurities is subjected to at least one purification treatment chosen from (a) a treatment with chlorine in th... | 02/20/2007 |
| 7157550 | Purification process of thermoprocessable tetrafluoroethylene copolymers A purification process of thermoprocessable tetrafluoroethylene (TFE) copolymers comprising the following steps: A) the polymer latex is transformed into gel form, under mechanical stirring, by addition of an acid electrolyte having pH values≦2; ... | 01/02/2007 |
| 7151197 | Processes for purifying chlorofluorinated compounds and processes for purifying CF3CFHCF3 Methods and materials are provided for the production of essentially isomerically pure perhalogenated and partially halogenated compounds. One embodiment of the present invention provides a process for the production of essentially isomerically pure CFC-216aa. Other... | 12/19/2006 |
| 7094935 | Adsorbent for purifying perfluorocarbon, process for producing same, high purity octafluoropropane and octafluorocyclobutane, and use thereof To provide a purification adsorbent capable of effectively removing impurities contained in a perfluorocarbon and obtaining a perfluorocarbon reduced in the impurity content to 1 ppm by mass or less; a process for producing the adsorbent; high-purity octafluoropropa... | 08/22/2006 |
| 7084315 | Removal of (hydro)haloalkene impurities from product streams A process for removing a (hydro)haloalkene impurity from a product stream containing that impurity and a desired compound is described. The process comprises contacting the product stream with a solid adsorbent comprising pores having openings which have a size acro... | 08/01/2006 |
| 7084316 | Process for purifying pentafluoroethane, process for producing the same, and use thereof A process comprising bringing crude pentafluoroethane containing at least one compound selected from the group consisting of hydrofluorocarbons containing one carbon atom, hydrochlorofluorocarbons containing one carbon atom and hydrochlorocarbons containing one carb... | 08/01/2006 |
| 7022813 | Process for purifying and reusing solvent used to remove extractables A process for treating biomedical devices, especially contact lenses, involves contacting polymeric devices containing extractables with a solvent that dissolves and thereby removes the extractables from the device, treating the solvent to remove extractables from t... | 04/04/2006 |
| 7015368 | Purification process of thermoprocessable tetrafluoroethylene copolymers A purification process of thermoprocessable tetrafluoroethylene (TFE) copolymers comprising the following steps: A) the polymer latex is transformed into gel form, under mechanical stirring, by addition of an acid electrolyte havin... | 03/21/2006 |
| 6967260 | Method for purification of tetrafluoromethane and use thereof Tetrafluoromethane containing ethylene compound, hydrocarbon compounds, carbon monoxide and/or carbon dioxide is contacted with zeolite having an average pore size of 3.4 to 11 Å and an Si/Al ratio of 1.5 or less and/or a carbonaceous adsorbent having an average p... | 11/22/2005 |
| 6897344 | Method of treating fluorine compound and treated substance Divalent and trivalent metal salts are added to the solution containing the fluorine compound to precipitate the layered double hydroxide containing the fluorine compound between layers. By these processes, the fluorine compound can be fixed with high rate. Moreover... | 05/24/2005 |
| 6821436 | Separation of halogenated compounds A process for removing a chlorinated methane impurity from a stream comprising a halogenated compound other than the chlorinated methane impurity, the process comprising contacting the stream with a polymer adsorbent to produce a purified product stream, the polymer... | 11/23/2004 |
| 6815568 | Process for purifying octafluorocyclobutane, process for preparing the same, and use thereof A process for purifying octafluorocyclobutane according to the present invention is characterized by contacting a crude octafluorocyclobutane containing impurities with an impurity decomposing agent under elevated temperature and then with an adsorbent to substantia... | 11/09/2004 |
| 6743957 | Method of treating fluorine compound Divalent and trivalent metal salts are added to the solution containing the fluorine compound and the polymer containing fluorine to precipitate the layered double hydroxide containing the fluorine compound between layers. At this time, the polymer containing fluori... | 06/01/2004 |
| 6710216 | Method and apparatus for recovering a solvent 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;... | 03/23/2004 |
| 6642415 | Method for recovering fluorinated emulsifiers Fluorinated emulsifiers, in particular, perfluorooctanoic acid are bound to anionic exchange resins for the purification of aqueous effluent from the production of fluoropolymers. Said emulsifiers may be quantitatively eluted from the exchanger with a wat... | 11/04/2003 |
| 6589444 | Process for separating water from chemical mixtures 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, d... | 07/08/2003 |
| 6555086 | Hydrogen fluoride recovery process Processes for separating and recovering hydrogen fluoride from a gaseous mixture of an organic compound and hydrogen fluoride are disclosed. The processes include contacting the gaseous mixture with a solution of an alkali metal fluoride in hydrogen fluor... | 04/29/2003 |
| 6544319 | Purification of hexafluoro-1,3-butadiene An HFBD purification process includes: (a) contacting a composition containing HFBD with an adsorbent to remove from the HFBD at least two impurities selected from the group consisting of water, an alcohol, hydrofluoric acid and a fluorinated olefin, wher... | 04/08/2003 |
| 6521461 | Fluoroalkene-nucleophile adducts for analysis and removal of fluoroalkenes A method for removing one or more fluorinated alkenes from a fluid comprises the step of contacting the fluid with an N-, S-, or P-containing nucleophile for a time sufficient to form an N-, S-, or P-containing nucleophile-fluoroalkene adduct. The nucleop... | 02/18/2003 |
| 6500994 | Purification of 1,1,1,3,3-pentafluorobutane A process for purification of 1,1,1,3,3-pentafluorobutane (HFC-365mfc) containing a decreased amount of hydrogen chloride, hydrogen fluoride and/or unsaturated impurities. To this end crude 1,1,1,3,3-pentafluorobutane is treated in the liquid phase with a... | 12/31/2002 |
| 6437202 | Fluoroalkene-nucleophile adducts for analysis and removal of fluoroalkenes A method for removing one or more fluorinated alkenes from a fluid comprises the step of contacting the fluid with an N-, S-, or P-containing nucleophile for a time sufficient to form an N-, S-, or P-containing nucleophile-fluoroalkene adduct. The nucleop... | 08/20/2002 |
| 6403849 | Method for purifying perfluorocarbons A method for obtaining purified perfluorocarbon compositions, and purified compositions containing such perfluorocarbons.... | 06/11/2002 |
| 6320087 | Adsorbent for separating halogenated aromatic compounds and separation method An adsorbing and separating agent for halogenated aromatic compounds and an adsorbing and separating method for the compounds, using an adsorbent which has a porosity of from 0.20 cc/cc to 0.37 cc/cc, a packing density of from 0.50 g/ml to 0.70 g/ml, and ... | 11/20/2001 |
| 6274782 | Method for purifying hexafluoroethane A purification method for purifying hexafluoroethane, comprising a step of making hexafluoroethane containing impurities of hydrofluorocarbons including two carbon atoms in a molecule contact a zeolite having a mean micropore size in a range of 3.5 Å to ... | 08/14/2001 |
| 6262322 | Adsorbent for aromatic isomers and production of aromatic isomers An adsorbent which comprises a zeolite containing Cs and/or Rb, said zeolite being characterized by that the ratio of [the number of moles of Cs and/or R in the zeolite] to [the number of moles of Al in the zeolite] is 0.1 or less. This adsorbent permits ... | 07/17/2001 |
| 6147268 | Fluoroalkene-nucleophile adducts for analysis and removal of fluoroalkenes A method for removing one or more fluorinated alkenes from a fluid comprises the step of contacting the fluid with an N-, S-, or P-containing nucleophile for a time sufficient to form an N-, S-, or P-containing nucleophile-fluoroalkene adduct. The nucleop... | 11/14/2000 |
| 6107529 | Purification of 1,1,1,2-tetrafluoroethane A process for the removal of 1,1,2,2-tetrafluoroethane from 1,1,1,2-tetrafluoroethane which comprises contacting 1,1,1,2-tetrafluoroethane containing 1,1,2,2-tetrafluoroethane with a zeolite having a mean pore size in the range of 3.8 Å an 4.8 Å. T... | 08/22/2000 |
| 5928479 | Process for the purification of pentafluoroethane A process for the purification of pentafluoroethane by removing chloropentafluoroethane therefrom which comprises adding to the impure pentafluoroethane a component which undergoes a non-ideal interaction with chloropentafluoroethane and/or with the azeot... | 07/27/1999 |
| 5895826 | Dielectric fluids Use of amino derivatives supported on inert supports in fluorinated fluids utilized in devices subjected to high specific energies to reduce to levels lower than the toxicity limits the toxic decomposition products of said fluorinated fluids.... | 04/20/1999 |
| 5892137 | Purification of pentafluroethane To remove the traces of chlorotrifluoroethylene (F1113) which are present in a pentafluoroethane (F125), the F125 is passed through a bed of active carbon.... | 04/06/1999 |
| 5852223 | Purification methods of pentafluoroethane The purification of pentafluoroethane (HFC-125) which is composed of a process A, in which an unpurified mixture (1), containing at least chloropentafluoroethane (CFC-115) and pentafluoroethane (HFC-125) is reacted with hydrogen (4) in the presence of a c... | 12/22/1998 |
| 5705719 | Selective removal of perfluoroisobutylene from streams of halogenated hydrocarbons An adsorption-desorption process using activated carbon removes perfluoroisobutylene from gaseous streams of halogenated hydrocarbons. Choice of gas and temperature profile used for desorption of adsorbed compounds and regeneration of the activated carbon... | 01/06/1998 |
