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Matches 551 - 600 out of 3,487

Document Document Title
WO/1999/019285A1
A process for the preparation of 1,1,1,2,2-pentafluoroethane by fluorinating a halohydro-carbonaceous feedstock containing 2-chloro-1,1,1,2-tetrafluoroethane with hydrogen fluoride in a gas phase, characterized in that: (i) a chromium fl...  
WO/1999/019284A1
Disclosed herein is a telomerization process for preparing fluorinated alkyl iodide telomers, comprising telomerizing a starting polyfluoroalkyl iodide with a terminally unsaturated perfluoro olefin or monochlorofluoro olefin.  
WO/1999/007659A1
The invention concerns a method for obtaining halogenated hydrocarbons comprising at least 3 carbon atoms which consists in reacting a haloalkane with a halogenated olefin in the substantial absence of nitrile and in introducing the reag...  
WO/1999/007660A1
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), 1,1,1-trifluoroethane (HFC-143a), chloropentafluo...  
WO/1999/006342A1
A process for the preparation of 1,1,1,2,3,3,3-heptafluoropropane (HFC 227ea) by reacting hydrogen fluoride with hexafluoropropane (HFP) in the vapour phase over a fluorination catalyst using a molar ratio of HF:HFP is at least 3.5:1. Th...  
WO/1999/002642A1
This invention provides a stabilized alkyl bromide based solvent system that is useful for cleaning and degreasing a wide variety of metal objects. The solvent is stabilized with a stabilizer system that includes a dialkyl carbonate such...  
WO/1999/001412A1
The invention relates to a continuous method for producing pentafluoroethyl iodine, iodine pentafluoride and tetrafluoroethylene, characterized in that the iodine is dissolved in iodine pentafluoride and the solution obtained is continuo...  
WO/1999/000897A1
Novel structures and methods for forming useful high temperature superconducting devices, most particularly resonators, are provided. Structures resulting in reduced peak current densities relative to known structures achieve numerous de...  
WO/1999/000344A1
A process for producing a hydrofluorocarbon (HFC) comprising: (a) providing a fluoropolymer-lined reactor; (b) adding a chlorinated organic compound in liquid phase and a fluorination agent to the reactor; and (c) reacting at least a por...  
WO/1999/000345A1
The invention provides a process for the preparation of 1,1,2,3,3,4-hexafluorobutane by telomerization of chlorotrifluoroethylene to produce 1,1,3,4-tetrachlorohexafluorobutane followed by reduction of that compound to 1,1,2,3,3,4-hexafl...  
WO/1998/056742A1
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/1998/054117A1
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/1998/052889A1
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/1998/051650A1
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/1998/051651A1
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/1998/051649A1
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/1998/050329A1
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/1998/050330A1
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/1998/050331A1
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/1998/042645A1
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/1998/040334A1
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/1998/040335A1
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/1998/037043A2
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/1998/037046A1
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/1998/037044A1
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/1998/033756A1
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/1998/008789A1
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/1998/008790A1
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/1998/006685A1
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/1998/000381A1
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/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/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/1997/038959A1
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/1997/038958A1
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...  

Matches 551 - 600 out of 3,487