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5635099 Near-azeotropic blends for use as refrigerants with pentafluoroethane, trifluoroethane, and tetrafluoroethane
PatentsALERT
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5635098 AZEOTROPIC AND AZEOTROPE-LIKE COMPOSITIONS OF A HEXAFLUOROPROPANE AND C5 HYDROCARBON Lunger Brooks S; Shealy Glenn S Newark, DE, UNITED STATES assigned to E I Du Pont de Nemours and Company This invention relates to compositions that include at least one hydrocarbon and at least one fluorinated species. Such compositions may be used as refrigerants, cleaning agents, expansion agents for foams such as polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, displacement drying agents, among others.
l-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,l -trifluoroethane and 1,2,2,2-tetrafluoroethane, propane and pentafluoroethane, or 1,1,I-trifluoroethane and octafluoropropane; and pentafluoroethane with fluoroethane and 1,2,2,2-tetrafluoroethane, along with their use as refrigerants.
5636526 APPARATUS AND METHOD FOR AUTOMATICALLY PURGING AN ABSORPTION COOLING SYSTEM Plzak William J; Jandal Daoud A, Seewald Jeffrey S Crescent, MN, UNITED STATES assigned to Gas Research Institute
5635099 NEAR-AZEOTROPIC BLENDS FOR USE AS REFRIGERANTS WITH PENTAFLUOROETHANE, TRIFLUOROETHANE, AND TETRAFLUOROETHANE Bivens Donald B; Shiflett Mark B; Yokozeki Akin-&hi Kennett Square, PA, UNITED STATES assigned to E I Du Pont de Nemours and Company Near-Azeotropic blends of: pentafluoroethane and l,l,l-trifluoroethane with one or more of chlorodifluoromethane, 1,2,2,2-tetmfluoroethane, 1,1,2,2-tetrafluoroethane, 1-chloro1,1,2,2-tetrafluoroethane,
A purge apparatus and method are disclosed for automatically purging an absorption cooling system. Noncondensible gas is drawn out of the absorber of the absorption cooling system by an eductor. The eductor entrains the gas in the fluid flow to the high pressure side of the system. The gas is drawn out of the high pressure side by a separate purge refrigeration system. The evaporator of the purge refrigeration system is located in a purge tank that is in free flow communication with the condenser of the absorption cooling system; Refrigerant vapor and intermixed noncondensible gas flow into the purge tank and the refrigerant vapor condenses on the purge refrigeration system evaporator. The condensed absorption refrigerant is returned to the absorption cooling system. The noncondensible gas collects in the purge tank and blankets the evaporator of the purge refrigeration system, causing the temperature of the purge refrigerant to decrease. At a specified temperature, a temperature sensor initiates a pump out of the noncondensible gas in the purge tank.
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5635098 AZEOTROPIC AND AZEOTROPE-LIKE COMPOSITIONS OF A HEXAFLUOROPROPANE AND C5 HYDROCARBON Lunger Brooks S; Shealy Glenn S Newark, DE, UNITED STATES assigned to E I Du Pont de Nemours and Company This invention relates to compositions that include at least one hydrocarbon and at least one fluorinated species. Such compositions may be used as refrigerants, cleaning agents, expansion agents for foams such as polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, displacement drying agents, among others.
l-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,l -trifluoroethane and 1,2,2,2-tetrafluoroethane, propane and pentafluoroethane, or 1,1,I-trifluoroethane and octafluoropropane; and pentafluoroethane with fluoroethane and 1,2,2,2-tetrafluoroethane, along with their use as refrigerants.
5636526 APPARATUS AND METHOD FOR AUTOMATICALLY PURGING AN ABSORPTION COOLING SYSTEM Plzak William J; Jandal Daoud A, Seewald Jeffrey S Crescent, MN, UNITED STATES assigned to Gas Research Institute
5635099 NEAR-AZEOTROPIC BLENDS FOR USE AS REFRIGERANTS WITH PENTAFLUOROETHANE, TRIFLUOROETHANE, AND TETRAFLUOROETHANE Bivens Donald B; Shiflett Mark B; Yokozeki Akin-&hi Kennett Square, PA, UNITED STATES assigned to E I Du Pont de Nemours and Company Near-Azeotropic blends of: pentafluoroethane and l,l,l-trifluoroethane with one or more of chlorodifluoromethane, 1,2,2,2-tetmfluoroethane, 1,1,2,2-tetrafluoroethane, 1-chloro1,1,2,2-tetrafluoroethane,
A purge apparatus and method are disclosed for automatically purging an absorption cooling system. Noncondensible gas is drawn out of the absorber of the absorption cooling system by an eductor. The eductor entrains the gas in the fluid flow to the high pressure side of the system. The gas is drawn out of the high pressure side by a separate purge refrigeration system. The evaporator of the purge refrigeration system is located in a purge tank that is in free flow communication with the condenser of the absorption cooling system; Refrigerant vapor and intermixed noncondensible gas flow into the purge tank and the refrigerant vapor condenses on the purge refrigeration system evaporator. The condensed absorption refrigerant is returned to the absorption cooling system. The noncondensible gas collects in the purge tank and blankets the evaporator of the purge refrigeration system, causing the temperature of the purge refrigerant to decrease. At a specified temperature, a temperature sensor initiates a pump out of the noncondensible gas in the purge tank.