|
Match
|
Document |
Document Title |
|
|
7608574 |
Azeotropic or azeotropic-like compositions of 1,1,1-trifuoroethane and 1-chloro-2,2,2-trifluoroethane
Azeotropic or azeotropic-like compositions of 1,1,1-trifluoroethane (HFC-143a) and 1-chloro-2,2,2-trifluoroethane (R-133a).
|
|
|
7476771 |
Azeotrope compositions comprising 2,3,3,3-tetrafluoropropene and hydrogen fluoride and uses thereof
Disclosed herein are azeotrope or near-azeotrope compositions comprising 2,3,3,3-tetrafluoropropene (HFC-1234yf) and hydrogen fluoride (HF). These compositions are useful in processes to produce...
|
|
|
7468467 |
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...
|
|
|
7468466 |
Process for producing hexafluoroethane and use thereof
A process for producing hexafluoroethane, comprising a step of distilling a crude hexafluoroethane containing chlorine compounds each having two carbon atoms to distill out hexafluoroethane as a...
|
|
|
7459591 |
Process for the obtention of purified heptafluoropropane
Process for the obtention of HFC-227ea having a reduced content of organic impurities, comprising at least subjecting a crude HFC-227ea to two distillation steps at different pressures.
|
|
|
7423188 |
Azeotrope compositions comprising E-1,3,3,3-tetrafluoropropene and hydrogen fluoride and uses thereof
Disclosed herein are azeotrope and near-azeotrope compositions comprising E-1,3,3,3-tetrafluoropropene and hydrogen fluoride. These azeotrope and near-azeotrope compositions are useful in processes...
|
|
|
7388117 |
Azeotrope compositions comprising 1,2,3,3,3-pentafluoropropene and hydrogen fluoride and uses thereof
Disclosed herein are azeotrope compositions comprising 1,2,3,3,3-pentafluoropropene and hydrogen fluoride. The azeotrope compositions are useful in processes to produce and in processes to purify...
|
|
|
7385094 |
Azeotrope compositions comprising tridecafluoro-3-heptene and hydrogen fluoride and uses thereof
Disclosed herein are azeotrope and near-azeotrope compositions comprising 1,1,1,2,2,4,5,5,6,6,7,7,7-tridecafluoro-3-heptene (HFC-162-13mczy, CF 3 CF 2 CH═CFCF 2 CF 2 CF 3 ) and...
|
|
|
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-134 a ) and polymer grade chlorodifluoromethane (HCFC-22) by contacting a mixture containing...
|
|
|
7371309 |
Purification of difluoromethane by extractive distillation
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),...
|
|
|
7361795 |
Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride
The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluorobutane (HFC-365) and hydrogen fluoride and a process for separating the azeotrope-like mixtures. The...
|
|
|
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...
|
|
|
7332635 |
Processes for purifying 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...
|
|
|
7311807 |
Process for the separation of mixtures containing m-and p-dichlorobenzene
A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene in which:
(i) the mixture is as an extracting agent contacted with a phosphoric ester of the...
|
|
|
7241928 |
Process for the manufacture of halocarbons and selected compounds and azeotropes with HF
A liquid phase process is disclosed for producing halogenated alkane adducts of the formula CAR 1 R 2 CBR 3 R 4 (where A, B, R 1 , R 2 , R 3 , and R 4 are as defined in the specification) which...
|
|
|
7208644 |
Production and use of hexafluoroethane
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...
|
|
|
7205444 |
1,1,1,3,3,3-hexafluoropropane purification with photochlorination equipment
A continuous, vapor phase method for purifying a crude mixture of 1,1,1,3,3,3-hexafluoropropane and one or more unsaturated fluorocarbon compounds, the process comprising:
a) providing a...
|
|
|
7189311 |
Purification of difluoromethane
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...
|
|
|
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...
|
|
|
7138553 |
Method for purifying tetrachloroethylene and process for producing hydrofluorocarbons
Tetrachloroethylene containing a stabilizer is contacted with a zeolite having an average pore size of 3.4 to 11 Å and/or a carbonaceous adsorbent having an average pore size of 3.4 to 11 Å in...
|
|
|
7074974 |
Process for the production of fluoroethane and use of the same
A process comprising fluorinating tetrachloroethylene to obtain a crude pentafluoroethane containing impurities and bringing the crude pentafluoroethane containing impurities into contact with...
|
|
|
7060165 |
Processes for purification and production of fluorocarbons
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...
|
|
|
7053253 |
Process for purifying hexafluoropropene dimers
Perfluoro-4-methyl-2-pentene containing the undesirable perfluoro-2-methyl-2-pentene may be purified by contacting the mixture with at least a stoichiometric equivalent of an aqueous inorganic base...
|
|
|
7045668 |
Production and use of hexafluoroethane
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...
|
|
|
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,...
|
|
|
6992229 |
Method for purifying a fluorinated hydroxyl compound
The present invention has an object to provide a method for purifying a fluorinated hydroxyl compound of the formula 1 safely in a high yield under industrially practical conditions. Namely, a...
|
|
|
6900362 |
Vapor phase production of 1,1,1,2,3,3,3-heptafluoropropane from hydrogen fluoride and hexafluoropropylene
A process for the production of HFC-227ea from HF and HFP is provided. This process takes advantage of an azeotropic composition of HF and HFC-227ea in order to produce HFC-227ea essentially free...
|
|
|
6863780 |
Process of separating/purifying pentafluoropropane
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...
|
|
|
6849772 |
Process for producing and purifying 1,1-difluoroethane, and product thus obtained
1,1-Difluoroethane containing less than 10 mg/kg of vinyl chloride is obtained by treatment, with hydrogen fluoride, of a crude 1,1-difluoroethane containing less than 1 mol of hydrogen chloride...
|
|
|
6849163 |
Method for producing tetrafluoroethylene
There is provided a process for recovering tetrafluoroethylene wherein an amount of energy required to obtain TFE is reduced. In the process for producing a TFE mixture as an intended mixture...
|
|
|
6844474 |
Process for the production of difluoromethane
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...
|
|
|
6794550 |
Method of making an aqueous dispersion of fluoropolymers
The invention provides a process for removing steam-volatile fluorinated emulsifiers in their free acid form, from aqueous fluoropolymer dispersions. The process comprises adding a nonionic...
|
|
|
6759381 |
Azeotrope-like compositions of 1-chloro-1,3,3,3-tetrafluoropropane and 1,2-dichloro-3,3,3-trifluoropropene
Provided are azeotropic and azeotrope-like mixtures of 1-chloro-1,3,3,3-tetrafluoropropane and 1,2-dichloro-3,3,3-trifluoropropene that are useful as an intermediate in the production of HFC-245fa....
|
|
|
6676809 |
Process for removal of hydrogen fluoride
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...
|
|
|
6660130 |
Apparatus for vaporization of liquids
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...
|
|
|
6646171 |
Process for the crystallization of sterically hindered compounds
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...
|
|
|
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...
|
|
|
6605193 |
Recovery of HFC-32
A method for isolating 32 from a crude mixture containing HCl and an azeotropic mixture of 32 and HF is provided without the need to isolate any HF azeotrope.
|
|
|
6552238 |
Separation of heavy ends from streams of halogenated alkanes
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...
|
|
|
6540882 |
Processes for the synthesis of pentafluorobutane and the separation of hydrogen fluoride and pentafluorobutane mixtures
The invention relates to a process of separation of mixtures containing HFC-365mfc/HF azeotropic compositions by two distillations at different pressures, as well as to a process of synthesis of...
|
|
|
6527917 |
Process for preparing pentafluoroethane
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...
|
|
|
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...
|
|
|
6488817 |
Purification of hydrofluorocarbons
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...
|
|
|
6458249 |
Process for purifying perfluorinated products
Nitrogen trifluoride (NF 3 ) containing less than 10 parts-per-million molar impurities, e.g., tetrafluoromethane (PFC-14), is disclosed. Azeotropic and extractive distillation processes using...
|
|
|
6414203 |
Method of treating 1,1,1,3,3-pentafluoropropane
A method for reducing the content of unsaturated impurities contained in 1,1,1,3,3-pentafluoropropane (R245fa), while maintaining the loss of R245fa at a minimum level. R245fa containing...
|
|
|
6407297 |
Preparation of fluorine-containing organic compounds
Preparation of a fluorine-containing organic compound by reacting a haloalkene with hydrogen fluoride wherein both the fluorine-containing organic compound and the haloalkene separately form...
|
|
|
6403849 |
Method for purifying perfluorocarbons
A method for obtaining purified perfluorocarbon compositions, and purified compositions containing such perfluorocarbons.
|
|
|
6375808 |
Process for producing difluoromethane
A process for refining difluoromethane by removing hydrogen fluoride, which is contained in difluoromethane difficult to remove. The process involves distilling a mixture of difluoromethane with...
|
|
|
6340781 |
Purification of pentafluoroethane
A process for the removal of chloroalkane, chlorofluoroalkane and/or hydrofluoroalkane impurities from pentafluoroethane which comprises contacting the impure pentafluoroethane with hydrogen at...
|
|
|
6333440 |
Process for perfluorocyclobutane purification
A process is disclosed for obtaining octafluorocyclobutane of increased purity from a mixture comprising (a) octafluorocyclobutane and (b) at least one halocarbon impurity which is difficult to...
|