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Matches 701 - 750 out of 6,376

Document Document Title
WO/1998/033756A1
A process is disclosed for producing the hydrofluorocarbon CF�3?CH�2?CHF�2?. The process involves dehydrofluorinating CF�3?CH�2?CF�3? at an elevated temperature in the vapor phase over a catalyst of (1) aluminum fluoride, (2)...  
WO/1998/032521A1
A method is proposed to recover and concentrate perfluorinated compounds and hydrofluorocarbon gases from effluent gases in manufacturing processes. The method involves contacting the gas with a membrane module equipped with inorganic, m...  
WO/1998/031649A1
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 involves contacting a corr...  
WO/1998/031650A1
In order to isomerize a hydrofluorocarbon with a certain thermodynamic stability (HFC 1) into hydrofluorocarbon with greater thermodynamic stability (HFC 2), the hydrofluorocarbon HFC1 is subjected to a thermal treatment in the presence ...  
WO/1998/028247A1
The invention provides a process for production of 1,1,1,2,3,3,3-heptafluoropropane, HFC-227ea. In particular, the invention provides an inexpensive process for producing HFC-227ea in good yield by reacting 1,1,1,3,3,3-hexafluoropropane,...  
WO/1998/027145A1
The invention relates to novel mixtures containing 50-99 wt. % 1,1,1,3,3-pentafluorobutane and 1 to 5o wt. % of at least one fluorohydrocarbon selected from a group consisting of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane, 1...  
WO/1998/021171A1
A process for the catalytic fluorination of hydrochlorocarbons and hydrochlorofluorocarbons in the liquid phase. The process is useful for fluorinating hydrochloropropanes, hydrochlorofluoropropanes, hydrochloropropenes and hydrochlorofl...  
WO/1998/019981A1
Disclosed is a process for the production of a highly fluorinated fluorocarbon comprising PFC-116, comprising the steps of contacting HF, an effective amount of chlorine, and a chlorofluorocarbon precursor selected from the group consist...  
WO/1998/019982A1
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 hydrocarbons, chlorocarbons and alcohols.  
WO/1998/012161A1
A method for the preparation of 1,1,1,3,3-pentafluoropropane (HFC-245fa) and 1-chloro-3,3,3-trifluoropropene (HCFC-1233). 1,1,1,3,3-pentachloropropane (HCC-240fa) is fluorinated with HF in a vapor phase in the presence of a vapor phase c...  
WO/1998/010862A1
A chromia-based fluorination catalyst in which the chromia is at least partially crystalline and which may contain a zinc or a compound thereof, the production of the catalyst by sintering amorphous chromia and its use in fluorination pr...  
WO/1998/008790A1
A process for refining difluoromethane by removing water which is contained in difluoromethane and has been believed to be difficult to remove, which process comprises distilling difluoromethane containing water to recover a distillate c...  
WO/1998/008789A1
A process for refining difluoromethane by removing hydrogen fluoride which is contained in difluoromethane and has been believed to be difficult to remove, which process comprises distilling a mixture of difluoromethane with hydrogen flu...  
WO/1998/006685A1
Process for removing water from compositions containing water, organics and hydrogen fluoride (e.g. product stream from vapour phase hydrofluorination processes, e.g. manufacture of HFA 134a, HFA 125 or HFA 32) by phase separation and pu...  
WO/1998/005610A2
A process is disclosed for preparing fluorine-containing compounds by reacting a compound which contains a halogen that can be replaced by fluorine with a fluoride or a mixture of fluorides of general formula (I): MeF, in the presence of...  
WO/1998/003498A1
Novel thienylcyclohexane derivatives of general formula (I), wherein R' is the 2-thienyl or 3-thienyl radical, R is the cyano radical or a radical of formula -C(O)A, and R2' is a saturated or unsaturated optionally cyclic hydrocarbon rad...  
WO/1998/001407A1
The preparation of 1,2-dichloroethane (EDC) is carried out by feeding ethylene and chlorine into circulating EDC (direct chlorination) such that the reaction mixture boils and the heat of the reaction is led away from the gas space.  
WO/1998/000380A1
The invention provides a process for the separation of azeotropic mixtures of fluorocarbons from hydrogen fluoride. The most preferred fluorocarbon for this invention is 1,1,1,3,3-pentafluoropropane, which is also known as HFC-245fa. The...  
WO/1998/000381A1
Provided are azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluoropropane (HFC-245fa) and hydrogen fluoride. Such are useful as an intermediate in the production of HFC-245fa. The latter is useful as a nontoxic, zero ozone depl...  
WO/1997/049656A1
A method for purifying 1,1,1,3,3-pentafluoropropane (HFC-245fa) by bringing at least one extractant selected from the group consisting of: (a) compounds represented by general formula (I): CxFyHz, compounds represented by general formula...  
WO/1997/047574A1
The present invention relates to mixtures of difluoromethane ("HFC-32") and chlorine. More particularly, the invention provides azeotrope-like compositions of HFC-32 and chlorine.  
WO/1997/045388A1
A process for preparing 1,1,1,3,3-pentafluoropropane by reacting at least one member selected among chlorofluororopropanes and chloropropanes represented by the general formula CX3CH2CHX2 (wherein X represents a fluorine atom or a chlori...  
WO/1997/043208A1
A method for separating hydrogen fluoride from a chemical mixture is provided. In the process of the invention, hydrogen fluoride is separated from a chemical mixture containing hydrogen fluoride by contacting the chemical mixture with a...  
WO/1997/038958A1
A process for producing a substantially pure polyfluorinated aliphatic hydrocarbon from a crude reaction solution thereof containing unsaturated hydrocarbon and halogenated saturated and unsaturated aliphatic hydrocarbon impurities is di...  
WO/1997/038959A1
Disclosed is a process for the separation of tar and non-volatile reagents from a reaction mixture formed when chlorinated carbon compounds are allowed to react with anhydrous hydrogen fluoride in a liquid phase to form fluorinated carbo...  
WO/1997/037955A1
1-Chloro-3,3,3-trifluoropropene (R-1233zd) or other olefin impurities are removed from 1,1,1,3,3-pentafluoropropane (R-245fa) by contacting the R-245fa in the liquid or vapor phase with chlorine in the presence of ultraviolet light provi...  
WO/1997/037956A1
A process is disclosed for producing a compound of the formula: CF3CHXCF3-zYz where X and Y are independently selected from the group consisting of H and Cl, and z is 0 or 1. The process involves (1) contacting CCl3CHXCC3-zYz,CCl2-zYz=CX...  
WO/1997/035820A1
Processes involving certain nickel metallacycles with phosphite ligands are disclosed as useful for the manufacture of selected substituted hydrocarbons. Also disclosed are selected compounds including both nickel and phosphite ligands.  
WO/1997/032835A1
A process for producing benzyl fluoride derivatives represented by general formula (II), wherein R1 represents hydrogen, lower alkyl, etc.; R2 represents hydrogen, piperazinyl, piperidyl, pyrrolidinyl, morpholinyl, amino or heteroaryl; a...  
WO/1997/031881A1
A process is disclosed for the preparation of 1,1,1,3,3,3-hexafluoropropanes including one or more of 1,1,1,3,3,3-hexafluoropropane, 2-bromo-1,1,1,3,3,3-hexafluoropropane, or 2,2-dibromo-1,1,1,3,3,3-hexafluoropropane wherein malononitril...  
WO/1997/031989A1
This invention relates to compositions of cyclopentane, and a compound selected from the group consisting of hydrofluorocarbons, hydrofluoroethers, or fluorinated sulfur compounds. Specifically these compounds may be selected from the gr...  
WO/1997/032238A1
This invention relates to a solvent system and process for cleaning cellulose triacetate polymer camera film. The solvent system comprises n-propyl bromide and a mix of an alkyl bromide in which the alkyl group contains 4 to 7 carbon ato...  
WO/1997/029162A1
A refrigerant mixture which scarcely effects the ozonosphere in the stratosphere, is less likely to cause global warming, and can be used as such together with conventional compressor lubricating oils other than ester oil in a convention...  
WO/1997/027163A1
An azeotrope consisting substantially of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride, and a method for separating R-245fa and/or HF from a mixture containing R-245fa and HF without the step of cleaning with water. This method comp...  
WO/1997/025304A1
This invention is a process for the selective preparation of fluorinated hydrocarbons from chlorinated hydrocarbons while minimizing formation of oligomeric and polymeric by-products. The process comprises providing a liquid phase contai...  
WO/1997/025301A1
This invention is a process for the selective and high yield preparation of 1,1-difluoroethane (CHF2-CH3, HFC-152a) from chloroethene while minimizing formation of oligomeric and polymeric byproducts. This process comprises providing a l...  
WO/1997/025300A1
A process for the selective and high yield preparation of 1,1-difluoroethane (CHF2-CH3, HFC-152a) for chloroethene and anhydrous hydrogen fluoride is disclosed. The process involves the reaction of chloroethene with anhydrous hydrogen fl...  
WO/1997/025142A1
Hydrogenation catalyst comprising palladium and an alkali metal, especially potassium, and its use in the production of hydrofluoroalkanes by hydrogenation of a halofluorocarbon or hydrohalofluorocarbon.  
WO/1997/024306A1
A process and a system uses a direct chlorination reactor for producing ethylene dichloride by direct chlorination, without the need for an oxychlorination unit. This ethylene dichloride may be used to make vinyl chloride monomer. In the...  
WO/1997/024307A1
A process for producing 1,1,1,3,3-pentafluoropropane which involves the first step of reacting in a gas phase 1,1,1,3,3-pentachloropropane with hydrogen fluoride to thereby give 1,1,1-trifluoro-3-chloro-2-propene; and the second step of ...  
WO/1997/023641A1
A process for the preparation of compounds of formula (II) wherein R1 is lower alkoxy, lower alkylamino, di-(loweralkyl)amino, or the monovalent radical A-NR3, wherein A is lower alkyl or A is R4R5NC(O)CH2 wherein, for example, R4 is hyd...  
WO/1997/021655A1
Chlorodifluoromethane is pyrolysed in the presence of pentafluoroethane to give tetrafluoroethylene which is then reacted with HF to produce pentafluoroethane.  
WO/1997/019903A1
A process for producing chloro-2,2,2-trifluoroethane as a co-product of the production of 1,1,1,2-tetrafluoroethane by hydrofluorination of trichloroethylene which comprises (i) treating the 1,1,1,2-tetrafluoroethane product stream conta...  
WO/1997/016501A1
An azeotrope-like composition comprising: (A) 1,1,1,2-tetrafluoroethane and (B) n-pentane. Also described is a heat transfer device comprising the azeotrope-like composition.  
WO/1997/013737A1
A process for producing 1,1,1,3,3-pentafluoropropane (HFC-245fa) which comprises reacting a halogenated propane represented by the following general formula, such as 1,1,1,3,3-pentachloropropane: CX3CH2CHX2 wherein X represents fluoro (F...  
WO/1997/013719A1
A process for separating and recovering hydrogen fluoride from a mixture with an organic compound especially a fluorine-containing compound by extraction with a solution of an alkali metal fluoride in hydrogen fluoride, phase separation ...  
WO/1997/012852A1
The invention concerns semi-fluorinated alkanes of the general formulae RFRH and RFRHRF, RF being a linear or branched perfluoroalkyl group and RH being a linear or branched saturated (hydrocarbon)-alkyl group.  
WO/1997/011042A1
A method for continuously preparing heptafluoropropane by converting hexafluoropropene with HF in the presence of a liquid hydrofluoride of a nitrogenous organic base of formula [B x nHF], where B is a nitrogenous organic base and n is a...  
WO/1997/011043A1
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 selectively.  
WO/1997/010192A1
The present invention provides the novel chlorofluorohydrocarbon 1,1-difluoro-1,4-dichlorobutane, and a process for its preparation by reacting 1,1,1,4-tetrachlorobutane with hydrogen fluoride in the liquid phase. The product has useful ...  

Matches 701 - 750 out of 6,376