279 results about "Pentafluoroethane" patented technology

The present invention relates to heat transfer compositions comprising 2,3,3,3-tetrafluoropropene, difluoromethane, pentafluoroethane, and 1,1,1,2-tetrafluoroethane for use in refrigeration, air-conditioning, heat pump systems, and other heat transfer applications. The inventive heat transfer compositions can possess reduced global warming potential while providing good capacity and performance.

Provided are: a working medium for a heat cycle, said working medium containing 1,2-difluoroethylene and exhibiting high stability, reduced environmental impact, and cycle performance that can replace that of R410A (a pseudo-azeotropic mixed refrigerant including difluoromethane and pentafluoroethane at a mass ratio of 1:1) and 1,1,1,2-tetrafluoroethane; a composition for heat cycle system, said composition using the medium; and a heat cycle system using the composition. The working medium for a heat cycle is characterized by the inclusion of 1,2-difluoroethylene and at least two types of hydrofluorocarbon selected from the group of hydrofluorocarbons that include a carbon-carbon double bond other than a saturated hydrofluorocarbon and 1,2-difluoroethylene.

To provide a working fluid for heat cycle containing 1,2-difluoroethylene, which has high stability, and which has cycle performance sufficient as an alternative to R410A (a pseudoazeotropic mixture refrigerant of difluoromethane and pentafluoroethane in a mass ratio of 1:1) or 1,1,1,2-tetrafluoroethane while the influence over global warming is suppressed, a composition for a heat cycle system comprising it, and a heat cycle system employing the composition.A working fluid for heat cycle, which contains at least two members selected from a saturated hydrofluorocarbon and a hydrofluorocarbon having a carbon-carbon double bond other than 1,2-difluoroethylene, and 1,2-difluoroethylene.

A method of preparing pentafluoroethane wherein chlorine-containing carbon compounds are fluorinated in the presence of chromium catalysts that are in an amorphous state and wherein the main component is chromium compounds with the addition of at least one metal element selected from the group composed of indium, gallium, cobalt, nickel, zinc and aluminum and the average valence of the chromium in said chromium compounds is not less than +3.5 but not more than +5.0. And said chromium catalysts and a preparation method thereof.A method of preparing pentafluoroethane wherein the total yield of chlorofluoroethane by-products can be decreased without significantly deteriorating the generation activity of the pentafluoroethane and compounds which can be recycled in the reaction system. And to provide catalysts for this fluorination and a preparation method thereof.

The invention relates to a ternary composition comprising: from 5 to 50% of difluoromethane;—from 2 to 20% of pentafluoroethane; and—from 30 to 90% of tetrafluoropropeae. The tetrafluoropropeae may be 1,3,3,3-tetrafluoropropene or 2,3,3,3-tetrafluoropropene. This composition can he used as a heat-transfer fluid in vapor compression circuit.

Refrigerant compositions are provided which include:(a) pentafluoroethane or trifluoromethoxydifluoromethane or hexafluorocyclopropane or mixtures thereof, in an amount from about 60 to about 70% by weight based on the weight of the composition;(b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane or trifluoromethoxypentafluoroethane or 1,1,1,2,3,3-heptafluoropropane or mixtures thereof, in an amount from about 26 to 36% by weight based on the weight of the composition; and(c) an ethylenically unsaturated or saturated hydrocarbon, optionally containing one or more oxygen atoms, having a boiling point from −12° C. to +10° C., or a mixture thereof, or a mixture of one or more of the hydrocarbons with one or more other hydrocarbons or ethers, said mixture having a bubble point from −12° C. to +10° C., in an amount from about 1% to 4% by weight based on the weight of the composition. Also provided is a process of refrigeration using the refrigerant compositions and a refrigeration apparatus containing the refrigerant compositions.

A method of preparing pentafluoroethane wherein chlorine-containing carbon compounds are fluorinated in the presence of chromium catalysts that are in an amorphous state and wherein the main component is chromium compounds with the addition of at least one metal element selected from the group composed of indium, gallium, cobalt, nickel, zinc and aluminum and the average valence of the chromium in said chromium compounds is not less than +3.5 but not more than +5.0. And said chromium catalysts and a preparation method thereof.A method of preparing pentafluoroethane wherein the total yield of chlorofluoroethane by-products can be decreased without significantly deteriorating the generation activity of the pentafluoroethane and compounds which can be recycled in the reaction system. And to provide catalysts for this fluorination and a preparation method thereof.

The present invention relates to a refrigerant mixture for substituting R502, R22 or R12 used in a vapor compression refrigerator or air conditioner and a refrigeration system using the same. More specifically, the present invention relates to a refrigerant mixture comprising a combination of two or three components, which is capable of being used without causing ozone layer destruction and global warming and at the same time, without replacement of the existing refrigeration system, wherein the components are selected from the group consisting of propylene, propane, 1,1,1,2-tetrafluoroethane, pentafluoroe thane, 1,1,1-trifluoroethane, 1,1-difluoroethane, dimethylether and isobutane; and a refrigeration system using the same.

Disclosed are working fluid compositions for heat transfer apparatuses, such as refrigeration systems, that include a refrigerant and an ester based lubricant. The working fluid may comprise ≦50% by weight of the ester based lubricant composition and ≧50% by weight of one or more refrigerant compounds. The ester based lubricant comprises an additive selected from the group consisting of: diaryl sulfides, arylalkyl sulfides, dialkyl sulfides, diaryl disulfides, arylalkyl disulfides, dialkyl disulfides, diaryl polysulfides, arylalkyl polysulfides, dialkyl polysulfides, dithiocarbamates, derivatives of 2-mercaptobenzothiazole, derivatives of 2,5-dimercapto-1,3,4-thiadiazole, and combinations thereof. The refrigerants may be C3-C8 hydrocarbons, trichlorofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), saturated hydrofluorocarbons, difluoromethane (HFC-32), 1,1,2,2-tetrafluoroethane (HFC-134), difluoroethane (HFC-152a), fluoroethane (HFC-161), R410A (a near-azeotropic mixture of difluoromethane (HFC-32) and pentafluoroethane (HFC-125)), 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), 1,1,1,3,3,3-hexafluoropropane (HFC-236fa), 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,1,1,3,3-pentafluorobutane (HFC-365mfc), hydrofluoroolefins, dimethyl ether, carbon dioxide, bis(trifluoromethyl)sulfide, and trifluoroiodomethane and combinations thereof.

The invention relates to a ternary composition comprising: from 5 to 50% of difluoromethane;—from 2 to 20% of pentafluoroethane; and—from 30 to 90% of tetrafluoropropeae. The tetrafluoropropeae may be 1,3,3,3-tetrafluoropropene or 2,3,3,3-tetrafluoropropene. This composition can be used as a heat-transfer fluid in vapor compression circuit.

In accordance with the present invention refrigerant compositions are disclosed. The refrigerant compositions contain comprise 11-28 weight percent difluoromethane; 34-59 weight percent pentafluoroethane; and 21-38 weight percent 2,3,3,3-tetrafluoropropene. The refrigerant compositions are useful in processes to produce cooling, in methods for replacing refrigerant R-404A or R-507A, and in refrigeration systems. These inventive refrigerant compositions can be used in stationary and mobile refrigeration equipment, and are particularly useful for transport refrigeration units.