摘要:
Methods and apparatus for a refrigeration heat exchanger section useful in circulating a substantially non-HCFC refrigerant mixture which comprises: a compressor means, an auxiliary condenser, a first condenser, a second condenser, a third condenser, a subcooler and a liquid/gas separator, wherein a subcooled refrigerant liquid mixture taken as bottoms from the liquid/gas separator is distributed and expanded by a first expansion means and a second expansion means to form first and second expanded streams, respectively, such that the first expanded stream is returned to the auxiliary condenser and compressor in order to avoid overheating of the compressor.
摘要:
Refrigerant composition are disclosed which comprises: (a) pentafluorethane, trifluoromethoxydifluoromethane or hexafluorocyclopropane, or a mixture of two or more thereof, in an amount of at least 75% based on the weight of the composition, (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluoropropane or a mixture of two or more thereof, in an amount of from 10 to 20 % by weight based on the weight of the composition and (c) an ethylenically unsaturated or saturated hydrocarbon, optionally containing one or more oxygen atoms, with a boiling point from -50 °C to +35 °C, or a mixture thereof in an amount from 1 % to 4 % by weight based on the weight of the composition the weight ratio of component (a): component (b) being at least 4:1.
摘要:
The invention concerns 1,1,1,3,3-pentafluorobutane which forms azeotropic or pseudo-azeotropic compositions with alkanes having 5 or 6 carbon atoms. These compositions are used in particular as foaming agents in polymeric cell-closed foams.
摘要:
Azeotrope or azeotrope-like compositions useful as refrigerants consist essentially of HFC-32, HFC-125 and at least one C 3 to C 9 hydrocarbon present in an amount of greater than 0 wt.% to less than 10 wt.% wherein after 50 wt.% of said composition is removed, such as by evaporation or boiling off, the difference in the original composition and the composition remaining is less than 10 wt.%. One suitable refrigerant is a ternary mixture of 28 wt.% HFC-32, 70 wt.% of HFC-125 and 2 wt.% isobutane.
摘要:
The present invention provides hydrofluorocarbon compositions suitable for use in a wide range of applications. The compositions of the present invention tend to be soluble in hydrocarbon lubricating oils, and thus, are especially useful in replacing CFC and HCFC compositions in refrigeration applications.
摘要:
Near-Azeotropic blends of: pentafluoroethane and 1,1,1-trifluoroethane with one or more of chlorodifluoromethane, 1,2,2,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, 1-chloro-1,1,2,2-tetrafluoroethane, 1-chloro-1,2,2,2-tetrafluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,2,3,3-heptafluoropropane, and perfluorocyclopropane; chlorodifluoromethane and pentafluoroethane with one or more of ethane, butane, isobutane, dimethyl ether, propylene, and difluoromethane; chlorodifluoromethane with 1,1,1-trifluoroethane and 1,2,2,2-tetrafluoroethane, propane and pentafluoroethane, or 1,1,1-trifluoroethane and octafluoropropane; and pentafluoroethane with fluoroethane and 1,2,2,2-tetrafluoroethane, along with their use as refrigerants.
摘要:
Provided are methods of introducing environmentally desirable refrigerants into refrigeration systems. The present methods involve recharging a refrigerant system that contains a chlorine-containing refrigerant and a lubricant comprising the steps of (a) removing the chlorine-containing refrigerant from the refrigeration system while retaining a substantial portion of the lubricant in said system; and (b) introducing to said system a composition comprising: (i) a refrigerant; (ii) a surfactant; and (iii) a solubilizing agent.
摘要:
A refrigerant composition comprising 1,1,1,2-tetrafluoroethane (R134a) and pentane wherein the weights of pentane and R134a are in the range: Pentane 1-5 %; R134a 99-95 %.
摘要:
A refrigerant composition is described which comprises:
(a) octafluopropane and, optionally, pentafluoroethane, 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 50 to 94% by weight based on the weight of the composition (c) an unsubstituted hydrocarbon of the formula C n H m 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.
摘要翻译:描述了一种制冷剂组合物,其包含:(a)基于组合物的重量,5-40%的八氟丙烷和任选的五氟乙烷,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,( 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(c)重量的50至94重量%,式C n的未取代的烃 H m,其中n为至少4,m为至少2n-2,甲基丙烷除外,其量为组合物重量的1至10重量%。