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7405334 |
Process for the reduction of acidic contaminates in fluorinated hydrocarbons
The present invention relates to processes for reducing the concentration of acidic impurities HF, HCl, HBr, HI, HNO 3 and H 2 SO 4 in fluorinated hydrocarbons. The process involves: (i)...
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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...
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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...
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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...
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7074434 |
Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions
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...
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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,...
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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...
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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...
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6437168 |
Method for production of aromatic fluorine compound
A method for efficiently extracting a reaction product containing a target aromatic fluorine compound formed by the halogen exchange reaction of an aromatic chlorine compound with a fluorinating...
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6403849 |
Method for purifying perfluorocarbons
A method for obtaining purified perfluorocarbon compositions, and purified compositions containing such perfluorocarbons.
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6399841 |
Method for separating hydrogen fluoride from its mixtures with 1,1,1,3,3-pentafluorobutane and method for making 1,1,1,3,3-pentafluorobutane
Hydrogen fluoride is separated from its mixtures with 1,1,1,3,3-pentafluorobutane by extraction using an organic solvent containing a 1,1,1,3,3-chloro(fluoro)butane.
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6328907 |
Azeotrope comprising pentafluoropropane and hydrogen fluoride and method for separating and purifying pentafluoropropane
There is provided an azeotropic mixture consisting substantially of 1,1,1, 3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or...
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6307115 |
Method for purifying pentafluoroethane
The invention relates to the purification of pentafluoroethane (F125) containing chloropentafluoroethane (F115) by liquid/liquid extraction or by extractive distillation. Perchloroethylene is used...
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6303838 |
Separating 1,1,1,3,3-pentafluoropropane from hydrogen fluoride
Disclosed are processes for separating 1,1,1,3,3-pentafluoropropane (HFC-245fa) from hydrogen fluoride (HF) by distillation, wherein hydrocarbons, chloroflurocarbons, hydrochlorofluorocarbons and...
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6297412 |
Process for purifying difluoromethane
A process for purifying difluoromethane, which comprises subjecting a mixture comprising difluoromethane and hydrogen fluoride to extraction treatment with at least one extractant selected from the...
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6294055 |
Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms
Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms, by extraction using an organic solvent.
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6191328 |
Method for 1, 1, 1, 3, 3-pentafluoropropane
HFC-245fa is effectively separated from the mixture comprising 1,1,1,3,3-pentafluoropropane (HFC-245fa) and HF through a purification process comprising contacting at least one extraction agent...
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6175045 |
Process for the preparation of pentafluoroethane
There is provided a process of effectively separating pentafluoroethane (HFC-125) from a mixture of HFC-125 and chloropentafluoroethane (CFC-115). When the mixture of HFC-125 and CFC-115 is...
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6156944 |
Extraction of hydrogen fluoride from a halocarbon/hydrogen fluoride azeotropic mixture
A process for the separation of mixtures containing halocarbons and hydrogen fluoride. Either water alone or a blend comprising water and hydrogen fluoride is added to a mixture comprising a...
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6013846 |
Azeotrope of HF and 1233zd
An azeotrope containing HF and 1233zd is provided, as are methods for separating this azeotrope from mixtures of HF and 1233zd which are HF-rich or 1233zd-rich and methods for making use of the...
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5973215 |
Process for separating and recovering hydrogen fluoride from mixtures
A process is disclosed for the liquid phase separation and recovery of hydrogen fluoride from a mixture comprising hydrogen fluoride and a fluorinated organic hydrocarbon. The process requires that...
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5874658 |
Purification of organic fluorine compounds
A method is disclosed for separating a mixture of at least one hydrofluorocarbon from hydrogen fluoride. The method comprising treating said mixture with a compound selected from the group...
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5874657 |
Process for the purification of 1,1-difluoroethane
The present invention relates to processes for separating 1,1-difluoroethane (HFC-152a) from vinyl chloride by using extractive distillation with an extractive agent selected from the aliphatic...
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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...
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5744669 |
Process for the conversion of a halogenated organic stream containing trace quantities of organic nitrates
A process for the conversion of a halogenated organic stream containing trace quantities of organic nitrates to produce a stream comprising hydrogenated hydrocarbonaceous compounds free from...
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5744662 |
Separation of R-12 and R-134a by a liquid-liquid extraction technique
A process for separating and purifying dichlorodifluoromethane and 1,1,1,2 tetrafluoroethane from a feed of their mixtures by liquid-liquid extraction with extracting solvent containing paraffinic...
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5696309 |
Purification of halogenated carbon compounds
Disclosed is a method of chlorinating vinylidene chloride contained in a solution 1,1 -dichloro-1-fluoroethane to provide a chlorinated compound having a boiling point different from the...
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5600041 |
Process for the selective removal of organic nitrates from a halogenated organic stream containing trace quantities of organic nitrates
A process for treating a stream containing halogenated organic compounds and having trace quantities of organic nitrates to produce a stream comprising halogenated organic compounds free from...
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5560899 |
Process for separating HF from its mixtures with hydrochlorofluorocarbons 123 and/or 124
The invention relates to a process for separating HF contained in liquid mixtures comprising HCFC 123 and/or 124. The mixtures, enriched in C 2 Cl 4 up to a content of such compound of 20-75% by...
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5426254 |
Process for the separation of hydrogen fluoride from its mixtures with 1,1,1-trifluoro-2-chloroethane
The invention relates to the separation of hydrogen fluoride (HF) from its mixtures with 1,1,1-trifluoro-2-chloroethane (F133a). By settling of the mixture of HF and F133a in the presence of...
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5175380 |
Process for removing impurities from perfluorinated alkyl bromides or alkylene dibromides
Mixtures of perfluorinated alkyl bromides or alkylene dibromides containing perfluorinated iodine compounds are irradiated with electromagnetic radiation in the wavelength range from 230 to 500 nm...
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5166453 |
Method for purification of ethylene compounds having fluorine-containing organic group
A purification method of a fluorine-containing alkylethylene comprises reacting the fluorine-containing alkylethylene with powdered metallic zinc in the presence of an aqueous acetic acid solution....
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5132474 |
Method of recovering hydrocarbon halide
The present invention provides a method of effectively recovering a hydrocarbon halide and the use of a specific aprotic polar compound for said method. Thus, the present invention provides a...
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5099082 |
Solvent extraction of I-141B from I-365
Partial or total separation of a mixture of 1,1,1,3,3-pentafluorobutane and 1,1-dichloro-1-fluoroethane by liquid-liquid extraction with solvents containing ethylene glycol, 2-butene-1,4-diol,...
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5099081 |
Solvent extraction of I-365 from I-141b
Partial or total separation of a mixture of 1,1,1,3,4-pentafluorobutane and 1,1-dichloro-1-fluoroethane by liquid-liquid extraction with methanol based solvent mixtures, such as methanol with...
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5095158 |
Solvent extraction of VDC from I-141b
Partial or total separation of a mixture of vinylidene chloride and 1,1-dichloro-1-fluoroethane by liquid-liquid extraction with solvents having a Hansen solubility parameter of about 30.8-32.0,...
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4910352 |
Method of preparing 1,1,1-trifluoro-2,2-dichloroethane from trifluorotrichloroethane
CF 3 CHCl 2 is easily obtained at good yield by reduction of CF 3 CCl 3 in an aqueous solution of Na 2 SO 3 and an acid acceptor such as hydroxide, carbonate or acetate of an alkali metal or...
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4766261 |
Purification of fluorocarbons
Fluorocarbons are purified and toxicity substantially reduced by contact with a substantially dry, strongly basic and strongly nucleophilic alkali or alkaline earth metal compound, and separating...
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4585567 |
Purification of fluorinated lubricants free from hydrogen
There is proposed a process for the purification of fluorinated lubricants, free from hydrogen, such as perfluorinated ethers or chlorofluorocarbons, whose elimination can be dangerous for the...
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4249917 |
Sterilization gas separation process
A process for the separation of a second mixture consisting essentially of ethylene oxide and dichlorodifluoromethane from a first mixture comprising ethylene oxide, dichlorodifluoromethane, and...
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4209470 |
Process for the separation of hydrogen fluoride from its mixtures with 1-chloro-1,1-difluoroethane
Process for the separation of hydrogen fluoride from its mixtures with 1-chloro-1,1-difluoroethane, such as those obtained in the manufacture of the latter. An auxiliary solvent, chosen from among...
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4137055 |
Process for separating tetrafluoroethylene from nitrogen and carbon monoxide
Tetrafluoroethylene, often obtained in industrial processes in admixture with nitrogen and/or carbon monoxide can be separated practically quantitatively by absorption in aliphatic hydrocarbons or...
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4042634 |
Fluorocarbon separation process
A process for removing the vapors of certain fluoro(alkyl vinyl ethers) from a mixture with the vapor of tetrafluoroethylene by contacting the mixture of vapors with a chilled aqueous liquid...
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3947558 |
Method of recovering HF from mixtures containing C.sub.1 -C.sub.3 halocarbon compounds
Hydrogen fluoride can be separated from an organic mixture of fluorinated C 1 -C 3 compounds and recovered for reuse by selectively absorbing the HF in a glycol in which the HF is soluble, but...
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3624166 |
PROCESS FOR THE SOLVENT EXTRACTION OF HALOALKANES
This invention relates to an improved method of separating haloalkanes from alkanes or other haloalkanes of lower halogen to carbon ratio by extraction with dialkyl sulfoxides, cyclic lactams or...
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3442961 |
SEPARATION OF HYDROGEN CHLORIDE FROM VINYLIDENE FLUORIDE
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3429937 |
FLUOROCARBON DERIVATIVES OF PARAFFIN WAX
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3347021 |
Separation of hydrogen chloride from higher boiling haloalkanes
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3236030 |
Process for preferentially absorbing and recovering a fluorinated hydrocarbon
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3230692 |
Separation of vinyl fluoride and acetylene
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