How to Chlorofluorocarbon?

Method for producing fluorinated organic compounds,Preparation of fluorinated olefins via catalytic dehydrohalogenation of halogenated hydrocarbons,Apparatus and method for point-of-use treatment of effluent gas streams,Lubricating oil for compression-type refrigerators containing pentafluoroethane and a polyvinyl ether,Novel catalytic method for the production of fluoroalkylenes from chlorofluorohydrocarbons

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198 results about "Chlorofluorocarbon" patented technology

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Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are fully or partly halogenated paraffin hydrocarbons that contain only carbon (C), hydrogen (H), chlorine (Cl), and fluorine (F), produced as volatile derivative of methane, ethane, and propane. They are also commonly known by the DuPont brand name Freon. The most common representative is dichlorodifluoromethane (R-12 or Freon-12). Many CFCs have been widely used as refrigerants, propellants (in aerosol applications), and solvents. Because CFCs contribute to ozone depletion in the upper atmosphere, the manufacture of such compounds has been phased out under the Montreal Protocol, and they are being replaced with other products such as hydrofluorocarbons (HFCs) (e.g., R-410A) and R-134a.

Method for producing fluorinated organic compounds

ActiveUS20070197842A1Preparation by hydrogen halide split-offPreparation by halogen replacementPtru catalystDistillation

Disclosed are processes for the production of fluorinated olefins, preferably adapted to commercialization of CF3CF═CH2 (1234yf). Three steps may be used in preferred embodiments in which a feedstock such as CCl2═CClCH2Cl (which may be purchased or synthesized from 1,2,3-trichloropropane) is fluorinated (preferably with HF in gas-phase in the presence of a catalyst) to synthesize a compound such as CF3CCl═CH2, preferably in a 80-96% selectivity. The CF3CCl═CH2 is preferably converted to CF3CFClCH3 (244-isomer) using a SbCl5 as the catalyst which is then transformed selectively to 1234yf, preferably in a gas-phase catalytic reaction using activated carbon as the catalyst. For the first step, a mixture of Cr2O3 and FeCl3 / C is preferably used as the catalyst to achieve high selectivity to CF3CCl═CH2 (96%). In the second step, SbCl5 / C is preferably used as the selective catalyst for transforming 1233xf to 244-isomer, CF3CFClCH3. The intermediates are preferably isolated and purified by distillation and used in the next step without further purification, preferably to a purity level of greater than about 95%.

Owner:HONEYWELL INT INC

Preparation of fluorinated olefins via catalytic dehydrohalogenation of halogenated hydrocarbons

ActiveUS20090043136A1Physical/chemical process catalystsPreparation by hydrogen halide split-offHalohydrocarbonHydrogen atom

A process for making a fluorinated olefin having the step of dehydrochlorinating a hydrochlorofluorocarbon having at least one hydrogen atom and at least one chlorine atom on adjacent carbon atoms, preferably carried out in the presence of a catalyst selected from the group consisting of (i) one or more metal halides, (ii) one or more halogenated metal oxides, (iii) one or more zero-valent metals / metal alloys, (iv) a combination of two or more of the foregoing.

Owner:HONEYWELL INT INC

Apparatus and method for point-of-use treatment of effluent gas streams

InactiveUS20040213721A1Highly efficient mannerReduce foaming in the scrubbing systemProcess control/regulationHydrogenSilanesChlorofluorocarbon

A system for abating undesired component(s) from a gas stream containing same, such as halocompounds, acid gases, silanes, ammonia, etc., by scrubbing of the effluent gas stream with an aqueous scrubbing medium. Halocompounds, such as fluorine, fluorides, perfluorocarbons, and chlorofluorocarbons, may be scrubbed in the presence of a reducing agent, e.g., sodium thiosulfate, ammonium hydroxide, or potassium iodide. In one embodiment, the scrubbing system includes a first acid gas scrubbing unit operated in cocurrent gas / liquid flow, and a second "polishing" unit operated in countercurrent gas / liquid flow, to achieve high removal efficiency with low consumption of water. The scrubbing system may utilize removable insert beds of packing material, packaged in a foraminous containment structure. The abatement system of the invention has particular utility in the treatment of semiconductor manufacturing process effluents.

198 results about "Chlorofluorocarbon" patented technology

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