277 results about "Pentafluoroethane" patented technology

A lubricating oil for compression-type refrigerators using a refrigerant containing pentafluoroethane which lubricating oil comprises a polyvinyl ether compound having (a) a constituting unit represented by general formula (I):or a polyvinyl ether compound having constituting unit (a) and (b) a constituting unit represented by general formula (I'):(wherein R represents a hydrocarbon group which has 1 to 3 carbon atoms and may have ether bond in the group, and R' represents a hydrocarbon group which has 3 to 20 carbon atoms and may have ether bond in the group) as the main component. The above lubricating oil shows excellent compatibility with hydrofluorocarbon refrigerants containing pentafluoroethane which can replace chlorofluorocarbons causing environmental pollution, has a high volume intrinsic resistance, and exhibits excellent stability and lubricating property.

The invention relates the multicomponent mixed working substance used for preparing dual-temperature by single-machine vapor compression refrigerator. The low temperature is between -60- -40Deg.C and the high temperature is between -25- 10Deg.C. The multicomponent mixed working substance comprises lower boiling working substance and high boiling working substance. The lower boiling working substance comprises tetrafluoromethane, ethylene, ethane, fluoroethylene, trifluoromethane, fluoromethane, hydrofluoeic ether, carbon dioxide, difluoromethane and penfluoroethane; the high boiling working substance comprises trifluoro-thane, hydrofluoeic ether, propylene, propane, perfluoropropylamine, propadiene, cyclopropane, difluo-monochloromethane, penta-monochloroethane, perfluoroethane, difluoroethane, isobutene, butane, butylenes, isobutylene, sevofluoropropane, hexafluoropropane, penfluoropropane and tetrachloromonofluoroethane.

A composition useful as a blowing agent having no flash point or reduced combustibility comprising 2-chloropropane and a gas selected from the group consisting of a fluorohydrocarbon, perfluorocarbons, fluoroethers, hydrofluoropolyethers and mixtures thereof is disclosed. A polyisocyanurate foam or a polyurethane modified polyisocyanurate foam having a mainly closed cell structure and also a method for preparing this foam, the latter comprising closed cells wherein a foam blowing agent consisting of a mixture of 2-chloropropane and one or more HFC compounds including pentafluoropropane, pentafluorobutane, heptafluoropropane, hexafluoropropane or pentafluoroethane are disclosed. Pentanes can be added if desired. Azeotropic mixtures in which 2-chloropropane is an ingredient are disclosed.

The present invention provides a refrigerant composition that is nonflammable, and ensures low LCCP and less burden on the environment. More specifically, the present invention relates a refrigerant composition containing difluoromethane (HFC32), pentafluoroethane (HFC125), and 2,3,3,3-tetrafluoropropene (HFO1234yf), the ratio of HFC32/HFC125/HFO1234yf being in a range surrounded by points (0/21/79 mass %), (16.6/25.3/58.1 mass %), and (0/28.4/71.6 mass %) in a ternary diagram of a refrigerant composition containing HFC32, HFC125, and HFO1234yf, and the composition essentially containing HFC32.

The preservation performance of a nonaqueous electrolyte secondary cell charged to high potential is improved while the initial capacity and the cycle property of the cell are also improved. The nonaqueous electrolyte secondary cell includes: a positive electrode having lithium phosphate and a positive electrode active material containing lithium cobalt compound oxide and lithium manganese nickel compound oxide having a layer structure, the lithium cobalt compound oxide having at least zirconium and magnesium added in LiCoO₂; a negative electrode having a negative electrode active material; and a nonaqueous electrolyte having a nonaqueous solvent and an electrolytic salt. The potential of the positive electrode is more than 4.3 V and 5.1 V or less based on lithium. The nonaqueous electrolyte contains vinylene carbonate as the nonaqueous solvent and, as the electrolytic salt, at least one of lithium bis(pentafluoroethane sulfonyl)imide and lithium bis(trifluoromethane sulfonyl)imide at 0.1 M or more and 0.5 M or less. The nonaqueous electrolyte contains 1,3-dioxane.

To provide a working medium for a heat pump which has less influence over global warming, which has favorable flame retardancy as compared with a working medium consisting solely of 1,1,2-trifluoroethylene, and with which a heat pump system stably exhibiting heat pump performance even at a higher working temperature can be obtained.

A working medium for a heat pump, which comprises 1,1,2-trifluoroethylene, at least one member selected from the group consisting of 1,1,1,2-tetrafluoroethane and pentafluoroethane, and at least one member selected from the group consisting of 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene and 3,3,3-trifluoropropene.

A non-flammable refrigerant mixture is disclosed. The non-flammable refrigerant mixture may include from 20 weight percent to 25.5 weight percent HFO-1234yf, (b) from 20 weight percent to 24.5 weight percent HFC-32, (c) from 24.5 weight percent to 30 weight percent HFC-125, (d) from 25.5 weight percent to 30 weight percent HFC-134a, and optionally (e) from about 0.0001 weight percent to 10 weight percent trans-HFO-1234ze. These refrigerant mixtures are useful as components in compositions also containing non-refrigerant components (e.g., lubricants), in processes to produce cooling, in methods for replacing refrigerants R-404A, R-507, R-407A, R-407C, R-407F and/or R-22, and in refrigeration apparatuses.

A binary refrigerating apparatus employs a refrigerant composition that has a small global-warming potential (GWP) to be earth friendly, can be used as a refrigerant capable of achieving a low temperature of −80° C., and is excellent in refrigerating capacity and other performance. A refrigerant composition used as a low-temperature-side refrigerant is a refrigerant mixture including a non-azeotropic mixture in which 20% by mass or less of carbon dioxide (R744) is mixed to difluoroethylene (R1132a). A refrigerant composition used as a high-temperature-side refrigerant is a combination of: a non-azeotropic mixture comprising the refrigerant group of difluoromethane (R32), pentafluoroethane (R125), 1,1,1,2-tetrafluoroethane (R134a) and 1,1,3-trifluoro ethane (R143a); and 1,1,1,2,3-pentafluoropentene (HFO-1234ze), having a global-warming potential (GWP) of 1500 or less.

Disclosed herein is a composition comprising (a) from 1 to 29 weight percent difluoromethane; (b) from 1 to 19 weight percent pentafluoroethane; (c) from 9 to 42 weight percent 1,1,2,2-tetrafluoroethane, 1,1,1,2-tetrafluoroethane, or a mixture thereof; and (d) from 34 to 68 weight percent 2,3,3,3-tetrafluoropropene, E-1,3,3,3-tetrafluoropropene or mixture thereof; wherein when the composition contains 2,3,3,3-tetrafluoropropene, the composition also contains at least some 1,1,2,2-tetrafluoroethane; wherein the ratio of component (a) to component (b) is at most 1.5:1; and wherein the ratio of component (c) to component (d) is at least 0.04:1. The compositions are useful in methods for producing cooling and heating, methods for producing air conditioning, methods for replacing HCFC-22, R-410A, R-407C, HFC-134a, CFC-12, HCFC-22 and HCFC-124 and in heat transfer systems including heat pumps and air conditioners.

The invention provides a refrigerant composition capable of being directly filled for replacing R22 in systems such as a household air conditioner/ heat pump and the like. The refrigerant comprises pentafluoroethane (R125), 1,1,1,2- tetrafluoroethane (R134a) and dimethyl ether (DME or RE170); and the preparation method of the refrigerant comprises the following step of physically mixing all the components under a liquid phase in the corresponding proportions. The refrigerant completely meets the requirement of environment protection and has the ODP (Ozone Destruction Potential) value of zero and low GWP (Global Warming Potential) value; the thermodynamic engineering performance and the parameters of the refrigerant are very close to R22; the pressure and the exhausting temperature of a compressor are lower than those of R22; any parts and the lubricating oil of the traditional R22 system do not need to be changed or replaced when R22 is replaced with the refrigerant; the refrigerant can be filled directly and has good cycle performance same as or slightly higher than R22.

Refrigerant composition are disclosed which comprises: (a) pentafluoroethane, 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.

The invention relates to a non-combustible mixing refrigerant suitable for deep refrigeration temperature of minus 80 DEG C to minus 100 DEG C. The non-combustible mixing refrigerant comprises five groups of materials, where the first group of material is tetrafluoromethane; the second group of material is trifluoromethane, hexafluoroethane or a mixture of the trifluoromethane and the hexafluoroethane; the third group of material is pentafluoroethane, trifluoroethane, perfluoropropane, difluoromethane or a mixture of two, three or multiple of the pentafluoroethane, the trifluoroethane, the perfluoropropane and the difluoromethane; the fourth group of material is iodotrifluoromethane, 1, 1, 2, 2-tetrafluoroethane, 1,1-difluoroethane, 2, 3, 3, 3-tetrafluoropropene, 1, 3, 3, 3-tetrafluoropropene or a mixture of two, three or multiple of the iodotrifluoromethane, the 1, 1, 2, 2-tetrafluoroethane, the 1,1-difluoroethane, the 2, 3, 3, 3-tetrafluoropropene and the 1, 3, 3, 3-tetrafluoropropene; the fifth group of material is perfluoro-n-butane, 1, 1, 1, 3, 3-perfluoropropane or a mixture of the perfluoro-n-butane and the 1, 1, 1, 3, 3-perfluoropropane; the molar concentrations of the five groups of materials are respectively 25-50%, 15-40%, 10-30%, 5-20% and 10-25%; and the non-combustible mixing refrigerant is safe in a back-heating type throttling refrigeration system, can realize the refrigeration in the temperature range of minus 80 DEG C to minus 100 DEG C and has low whole green house effect without ozone depletion effect.

Compositions are disclosed which contain a refrigerant component consisting essentially of at least one refrigerant having an OEL less than 400; and a combination of refrigerants, each having an OEL greater than 400, consisting essentially of HFC-134a; HFC-32; trans-HFO-1234ze; and optionally at least one refrigerant selected from the group consisting of HFC-134 and HFC-125; provided that HFC-134a is not greater than 26 weight percent of the refrigerant component and the total of HFC-134a and HFC-134 is not less than 20 weight percent of the refrigerant component; and optionally a non-refrigerant component; wherein the refrigerant component has an overall OEL of at least 400 and wherein components the refrigerant component is non-flammable. These compositions are useful in processes to produce refrigeration, in methods for replacing refrigerant R-404A or R-507A, and in refrigeration apparatus.

The invention provides a novel environmentally friendly mixed refrigerant, 1,1,2-trifluoroethylene and the substances like 1,1-difluoroethylene, 1,1,2,3,3,3-hexafluoropropylene and 1,1-difluoromethaneare added in trifluoropropene or tetrafluoropropene, so that the direct filling performance of the mixed refrigerant in an air conditioner system is improved. In addition, the invention further provides the novel environmentally friendly mixed refrigerant, nonflammable halogenated substances with more iodine or fluorine atoms like 1,1,2,2-tetrafluoroethane, 1,1,1,2-tetrafluoroethane, 1,1,1,2,2-pentafluoroethane, 1,1,1,2,3,3,3-heptafluoropropane and iodotrifluoromethane are added in to the mixture, so that the flammability of the refrigerant is reduced.

A process comprising bringing crude pentafluoroethane containing at least one compound selected from the group consisting of hydrofluorocarbons containing one carbon atom, hydrochlorofluorocarbons containing one carbon atom and hydrochlorocarbons containing one carbon atom, into contact with an adsorbent comprising a zeolite having an average pore size of 3 to 6 Å and a silica/aluminum ratio of 2.0 or less and/or a carbonaceous adsorbent having an average pore size of 3.5 to 6 Å, to reduce the content of the compound. The purified gas can be used as a low temperature refrigerant or an etching gas.

A method of charging and recharging a refrigerant loop with a ternary refirgerant composition, wherein substantially equal proportions of difluoromethane and pentafluoroethane are added to the loop in substantially equal proportion by mass, during the step of charging and recharging.

A process for producing 1,1,1,2,2-pentafluoroethane by fluorinating with hydrogen fluoride at least one of 2,2-dichloro-1,1,1-trifluoroethane and 2-chloro-1,1,1,2-tetrafluoroethane as a starting material, the process being characterized by separating the reaction mixture resulting from the fluorination into a product portion A mainly containing 1,1,1,2,2-pentafluoroethane and a product portion B mainly containing 2,2-dichloro-1,1,1-trifluoroethane, 2-chloro-1,1,1,2-tetrafluoroethane and hydrogen fluoride, removing a fraction mainly containing 2,2-dichloro-1,1,1,2-tetrafluoroethane from the product portion B, and recycling the rest of the product portion B as part of feedstocks for fluorination.According to the process of the invention, the amount of CFC-115 contained in the target HFC-125 can be remarkably reduced through a simplified procedure.

The invention discloses a device and a method for purifying trifluoromethane. The device comprises a rectification device and an adsorption device connected with the rectification device, wherein the rectification device comprises a first-stage rectification device, a second-stage rectification device and a third-stage rectification device which are connected in sequence; the adsorption device comprises a low-temperature adsorption device and a filling device which are connected in sequence; the low-temperature adsorption device of the adsorption device is connected with the rectification device. Compared with the prior art, the purity of trifluoromethane purified by adopting the device is relatively high, the device is easy to operate, and a purification process is complete, reliable and good in repeatability. The removal of conventional impurities is considered, difficultly removed carbon dioxide, monochlorodifluoromethane, pentafluoroethane, water and particles are removed to be in a qualified range, and the product purity is 99.999% and meets the use requirements of the semiconductor industry.

Hydrofluorocarbon refrigerant compositions enable the use of existing compressor technologies in heat pump water heaters in a reliable (low discharge temperatures and pressures) and efficient (high capacity and efficiency) manner. The refrigerant comprises blends of pentafluoroethane (HFC-125), difluoromethane (HFC-32), tetrafluoroethane (HFC-134a) and tetrafluoropropene (HFO-1234ze).