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Matches 551 - 600 out of 3,458

Document Document Title
WO/1998/056742
A method for isolating and purifying 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride from a mixture of them, characterized by distilling an azeotropic mixture of 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride from a mixt...  
WO/1998/054117
A compound having the formula: CF¿3?CH¿2-w?(H¿1-x?CH¿2-y?R¿m?R'¿n?CH¿1-z?)¿p?H¿2-q ?CF¿3? wherein w=0, 1 or 2; x=0 or 1; y=0, 1 or 2; m=0, 1 or 2; n=0 or 1; z=0 or 1; p=1 or 2; and q=0, 1 or 2; with the provisos that 1$m(F)w+x$...  
WO/1998/052889
A method by which pentafluoroethane (HFC-125) can be efficiently separated from a mixture of HFC-125 with chloropentafluoroethane (CFC-115). The process for preparing high-concentration HFC-125 by the extractive distillation of a mixture...  
WO/1998/051650
Compositions comprising linear or cyclic fluorinated, saturated hydrocarbons of the following general formulae (I): Rf�1?-R�1?-Rf�2? and (II): Rf�1?-R�2?-Rf�2?. Each composition comprises more than 10 molar % and less than 95...  
WO/1998/051651
Incombustible fluorinated hydrocarbons excellent in detergency and stabilities to alkalis, water and heat; and polymer-containing fluids obtained by dissolving or dispersing a film-forming polymer, preferably a fluoropolymer in a solvent...  
WO/1998/051649
Compositions comprising linear or cyclic fluorinated, saturated hydrocarbons of the following general formula (I) Rf�1?-R�1?-Rf�2? and (II) Rf�1?-R�2?-Rf�2, and the use thereof. Each composition comprises more than 10 molar %...  
WO/1998/050329
The invention concerns a method for obtaining 1,1,1,3,3-pentachlorobutane which consists in reacting carbon tetrachloride with 2-chloroprop-1-ene in the presence of a copper (I) or (II) compound as telomerisation catalyst. Advantageously...  
WO/1998/050330
The invention concerns a method for obtaining halogenated hydrocarbons containing at least 3 carbon atoms by reacting a haloalkane with an olefin in the presence of a copper organic compound as catalyst, of a solvent and/or a co-catalyst...  
WO/1998/050331
A process for removing carbon dioxide from a fluorocarbon carbon dioxide mixture in which the fluorocarbon carbon dioxide mixture is contacted with a semipermeable polyimide membrane to form at least one exit stream having an increased c...  
WO/1998/042645
A process is disclosed for forming adducts of the formula: RR?1�R?2�CCR?1�R?2�F or (FR?1�R?2�CCRR?2�CH�2?)�2? where R is CH�3?, CH�2?F, C�2?H�4?F or F(CF�2?)�n?CH�2?CH�2? (where n is an integer from 1 to...  
WO/1998/040334
The present invention provides a process for the preparation of chlorofluorohydrocarbon 1,1-difluoro-1,4-dichlorobutane by reacting 1,1,1,4-tetrachlorobutane or 1,1,4-trichlorobut-1-ene with hydrogen fluoride in the vapour phase. The pro...  
WO/1998/040335
A tetrahalogenopropane as a starting material is chlorofluorinated by reacting it preferably with chlorine and hydrofluoric acid in the presence of a catalyst to thereby obtain 1,1,1,3,3-pentafluoropropane. Thus, 1,1,1,3,3-pentafluoropro...  
WO/1998/037043
A process is disclosed for producing the pentafluoropropenes of the formula CF�3?CX=CF�2?, where X is H or Cl. The process involves hydrodehalogenating CF�3?CCl�2?CF�3? with hydrogen at an elevated temperature in the vapor phas...  
WO/1998/037046
A process for producing n-propyl bromide during the bromination of bis- of trisphenols uses non-aqueous n-propanol as the bromination solvent, providing salable yields of n-propyl bromide to accompany the brominated bisphenol or trisphenol.  
WO/1998/037044
The invention relates to a method for cleaning methyl chloride contaminated with C�1?-C�3? hydrocarbons and/or isobutane. The invention relates in particular to a method for removing impurities from methyl chloride used in the produc...  
WO/1998/033756
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/1998/032521
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/1998/031649
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/1998/031650
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/1998/028247
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/1998/027145
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/1998/021171
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/1998/019981
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/1998/019982
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/1998/012161
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/1998/010862
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/1998/008789
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/1998/008790
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/1998/006685
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/1998/005610
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/1998/003498
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/1998/001407
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/1998/000381
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/1998/000380
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/1997/049656
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/1997/047574
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/1997/045388
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/1997/043208
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/1997/038959
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/1997/038958
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/1997/037956
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/1997/037955
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/1997/035820
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/1997/032835
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/1997/031881
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/1997/032238
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/1997/031989
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/1997/029162
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/1997/027163
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/1997/025142
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.  

Matches 551 - 600 out of 3,458