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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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WO/1997/025304 |
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...
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WO/1997/025300 |
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...
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WO/1997/025301 |
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...
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WO/1997/024307 |
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 ...
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WO/1997/024306 |
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...
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WO/1997/023641 |
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...
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WO/1997/021655 |
Chlorodifluoromethane is pyrolysed in the presence of pentafluoroethane to give tetrafluoroethylene which is then reacted with HF to produce pentafluoroethane.
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WO/1997/019903 |
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...
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WO/1997/016501 |
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.
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WO/1997/013719 |
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 ...
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WO/1997/013737 |
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...
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WO/1997/012852 |
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.
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WO/1997/011042 |
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...
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WO/1997/011043 |
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.
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WO/1997/010192 |
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 ...
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WO/1997/009292 |
A process for the preparation of 4-bromo-1,1-difluorobut-1-ene comprising the step of reacting 2,4-dibromo-1,1,1-trifluorobutane with a defluorobrominating agent in a liquid reaction mass and recovering the desired product therefrom. The...
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WO/1997/008117 |
A process is disclosed for the preparation of a fluorinated aliphatic olefin having the formula: CHaF3-a-CH2-CHbF3-b, wherein a is 0 or the integer 1 or 2 and b is 0 or the integer 1, 2 or 3. In the first step of the process, a chlorinat...
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WO/1997/007052 |
A process is disclosed for recovering HF from a product mixture comprising HF and at least one compound having the formula CF3CCl2+xF1-x (where x is 0 or 1). The process includes the steps of distilling the product mixture to remove all ...
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WO/1997/007083 |
A process for the preparation of halogenated alkanes is provided . In particular, a process is provided for the highly selective preparation of haloalkanes, including 1,1,1,3,3-pentachloropropane, pentachlorobutane, and hepatchlorohexane...
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WO/1997/007084 |
This invention relates to a process for producing 1,1,1,2-tetrafluoroethane (HFC-134a). The process reacts, 1,1,1-trifluoro-2-chloroethane (HCFC-133a) and hydrogen fluoride in a first reactor. The product resulting from the first reactio...
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WO/1997/005090 |
A liquid phase process is disclosed for producing halogenated alkane adducts of the formula: CAR1R2CBR3R4 (where A, B, R1, R2, R3 and R4 are as defined in the specification) which involves contacting a corresponding halogenated alkane, A...
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WO/1997/005089 |
A liquid phase process is disclosed for producing halogenated alkane adducts of the formula: CAR1R2CBR3R4 (where A, B, R1, R2, R3, and R4 are as defined in the specification) which involves contacting a corresponding halogenated alkane, ...
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WO/1997/003936 |
A process is disclosed for removing chloropentafluoroethane (CFC-115) from a mixture comprising CFC-115, difluoromethane (HFC-32), pentafluoroethane (HFC-125), or from mixtures of these compounds, by azeotropic or extractive distillation.
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WO/1997/003036 |
A method for preparing 'alpha','omega'-bromochloroalkanes by hydrochlorinating a cyclic ether optionally mixed with water, and reacting the resulting phase with gaseous hydrobromic acid without prior purification or separation.
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WO/1997/003037 |
A method for preparing 'alpha','omega'-bromochloroalkanes by hydrobrominating a cyclic ether and reacting the resulting phase with thionyl chloride without prior purification or separation.
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WO/1997/002227 |
A process for the Lewis acid catalyzed addition of trifluoromethanes across the carbon-carbon double bond of fluoroolefins is disclosed. A process for isomerization of monohaloperfluoro alkanes is also disclosed.
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WO/1997/002226 |
This invention concerns processes for the preparation of fluoroolefins, including a process for the deiodofluorination of an iodine containing fluorocarbon comprising contacting said iodine containing fluorocarbon with a fluroolefin capa...
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