Abstract:
Disclosed herein are fluoroether refrigerant or heat transfer fluid compositions that are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor systems that employ two-stage compressors or single slab.single pass heat exchangers.
Abstract:
Disclosed herein are 1,1,1,3,3-pentafluorobutane refrigerant or heat transfer fluid compositions further comprising hydrofluorocarbon, , N-(difluoromethyl)-N,N-dimethylamine, 1,1,1,2,2-pentafluoro-2-[(pentafluoroethyl)thio]ethane or mixtures thereof, which are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage compressors or single slab.single pass heat exchangers.
Abstract:
The present invention relates to compositions for use in refrigeration and air-conditioning systems comprising 1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane and at least one chlorocarbon, alcohol, ketone, ether, ester, N-(difluoromethyl)-N,N-dimethylamine, or mixtures thereof. Further, the present invention relates to compositions for use in refrigeration and air-conditioning systems employing a centrifugal compressor comprising 1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane and at least one chlorocarbon, alcohol, ketone, ether, ester, N-(difluoromethyl)-N,N-dimethylamine, or mixtures thereof. The compositions of the present invention may be azeotropic or near-azeotropic and are useful in processes for producing cooling or heat or as heat transfer fluids.
Abstract:
Present invention relates to novel fluorinated ethers and to a process for producing such fluorinated ethers. Such fluorinated ethers find use in as solvents, anesthetics, refrigerants, cleaning compositions, dry cleaning compositions, blowing agents, flame retardants, formulations of dyes used in optical recording media, microemulsions, and heat transfer compositions. The fluorinated ethers have the formula R-O-R 1 wherein R = CF 3 -CXH-CYZ wherein each of X, Y and Z are independently H or halogen; and R 1 is a C 1 to C 16 alkyl group or a halogen substituted C 1 to C 16 alkyl group.
Abstract:
Disclosed herein are fluoroether refrigerant or heat transfer fluid compositions that are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor systems that employ two-stage compressors or single slab.single pass heat exchangers.
Abstract:
Disclosed herein are hydrofluorocarbon refrigerant or heat transfer fluid compositions that are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage compressors or single slab.single pass heat exchangers.
Abstract:
Refrigerant compositions are disclosed which comprise: (a) pentafluoroethane, octafluoropropane, trifluoromethoxydifluoromethane or hexafluoro-cyclopropane, or a mixture of two or more thereof, in an amount from 5 to 60 % based on the weight of the composition, (b) pentafluoroethane, 1,1,1,2- or 1,1,2,2-tetrafluoroethane, 1,1-difluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3,3-heptafluoropropane or 1,1,1,2,2,3,3-heptafluoropropane, or a mixture of two or more thereof, in an amount from 30 to 94 % by weight based on the weight of the composition and (c) an unsubstituted hydrocarbon of the formula CnHm in which n is at least 4 and m is at least 2n-2, other than methyl propane, in an amount from 1 to 10 % by weight based on the weight of the composition.
Abstract translation:公开了制冷剂组合物,其包含:(a)五氟乙烷,八氟丙烷,三氟甲氧基二氟甲烷或六氟环丙烷,或其两种或多种的混合物,其量为组合物重量的5-60%,(b)五氟乙烷, 1,1,1,2-或1,1,2,2-四氟乙烷,1,1-二氟乙烷,三氟甲氧基五氟乙烷,1,1,1,2,3,3,3-七氟丙烷或1,1,1,2 ,2,3,3-七氟丙烷或其两种或多种的混合物,其量为组合物重量的30至94重量%,和(c)式C n H m的未取代的烃,其中n为 基于组合物的重量,至少4和m至少为2n-2,除了甲基丙烷,其量为1至10重量%。
Abstract:
The present invention provides binary azeotropic composition consisting essentially of C3F7-OCH3 and a second component selected from the group consisting of an unsubstituted alkane having 5 to 7 carbon atoms, methyl formate, acetone, methanol, 1,1,1,3,3,3-hexafluoro-2-propanol, methylene chloride and trans-1,2-dichloroethylene. The present invention also discloses tertiary azeotropic composition consisting essentially of C3F7-OCH3, a second component selected from the group consisting of methanol and 1,1,1,3,3,3-hexafluoro-2-propanol and a third component selected from the group consisting of methylene chloride and trans-1,2-dichloroethylene. The azeotropic composition of this invention may be used in various applications and in particular as refrigerant, in cleaning applications, in heat transfer applications, in coating applications, and the like.
Abstract:
A group of refrigerant fluids that may be combined in novel ways to produce several excellent "drop-in" substitutes for R-134a refrigerant. Performance is increased by constructing a zeotropic mixture of refrigrants, such that a single boiling point (of R-134a) is replaced by a "temperature glide" between the mixture's "bubble point" and "dew point". The temperature glide causes the phase change area in the condenser to be larger than with a single component refrigerant such as R-134a, thereby increasing heat rejection of the condenser, which lowers head pressures, and increases capacities and efficiencies compared to R-134a. Components are also selected to attempt to reduce the overall critical temperature of the mixture of refrigerants, also increasing performance and lowering head pressures under hot conditions with undersized condensers. Finally, a small amount of a mineral oil miscibility improver may be added, not to return mineral oil from the evaporator as in R-12 systems, but to keep waxes, tars, and other contaminates in the system that may have arisen from the manufacturing process (such as wax coatings on the motor windings in a hermetic compressor, or "tar" from valve packing) soluble.