WO1994000528A1 - Mixtures of pentafluoroethane and trifluoroethane - Google Patents
Mixtures of pentafluoroethane and trifluoroethane Download PDFInfo
- Publication number
- WO1994000528A1 WO1994000528A1 PCT/US1993/005721 US9305721W WO9400528A1 WO 1994000528 A1 WO1994000528 A1 WO 1994000528A1 US 9305721 W US9305721 W US 9305721W WO 9400528 A1 WO9400528 A1 WO 9400528A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- compositions
- weight percent
- pentafluoroethane
- trifluoroethane
- azeotropic
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 66
- GTLACDSXYULKMZ-UHFFFAOYSA-N pentafluoroethane Chemical compound FC(F)C(F)(F)F GTLACDSXYULKMZ-UHFFFAOYSA-N 0.000 title claims abstract description 26
- UJPMYEOUBPIPHQ-UHFFFAOYSA-N 1,1,1-trifluoroethane Chemical compound CC(F)(F)F UJPMYEOUBPIPHQ-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000009835 boiling Methods 0.000 claims description 20
- 238000005057 refrigeration Methods 0.000 claims description 13
- 238000001704 evaporation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 2
- 239000003507 refrigerant Substances 0.000 abstract description 10
- 239000003795 chemical substances by application Substances 0.000 abstract description 8
- 239000003989 dielectric material Substances 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract description 4
- 229920000098 polyolefin Polymers 0.000 abstract description 4
- 229920002635 polyurethane Polymers 0.000 abstract description 4
- 239000004814 polyurethane Substances 0.000 abstract description 4
- 239000003380 propellant Substances 0.000 abstract description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 9
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 7
- SGVQWMHGPNLWSW-UHFFFAOYSA-N chloro(difluoro)methane;1-chloro-1,1,2,2,2-pentafluoroethane Chemical compound FC(F)Cl.FC(F)(F)C(F)(F)Cl SGVQWMHGPNLWSW-UHFFFAOYSA-N 0.000 description 7
- 238000005204 segregation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005194 fractionation Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 1
- BHNZEZWIUMJCGF-UHFFFAOYSA-N 1-chloro-1,1-difluoroethane Chemical compound CC(F)(F)Cl BHNZEZWIUMJCGF-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- -1 heating applications Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000005437 stratosphere Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/30—Materials not provided for elsewhere for aerosols
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C19/00—Acyclic saturated compounds containing halogen atoms
- C07C19/08—Acyclic saturated compounds containing halogen atoms containing fluorine
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
- C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
- C09K5/044—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds
- C09K5/045—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds containing only fluorine as halogen
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
- C09K2205/22—All components of a mixture being fluoro compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
- C09K2205/32—The mixture being azeotropic
Definitions
- This invention relates to azeotropic compositions of pentafluoroethane and 1,1,1-trifluoroethane.
- chlorofluoro- carbons have come under scientific scrutiny, because it has been postulated that these materials because of their high stability are able to reach the stratosphere where under the influence of ultraviolet radiation release chlorine atoms which, in turn, undergo chemical reaction in the stratospheric ozone. Reduction of stratospheric ozone would increase the amount of ultraviolet radiation reaching the earth's surface.
- the present invention is directed to azeotropic compositions consisting essentially of about 5-45 weight percent, preferably about 4045 weight percent, pentafluoroethane, and 55-95 weight percent, preferably about 55-60 weight percent, 1,1,1-trifluoroethane, said composition boils at -16.9° C at about 51 psia.
- novel compositions of the present invention exhibit lower vapor pressures than either of its two fluorocarbon constituents.
- the compositions described herein resist component segregation which would seriously diminish their usefulness in the contemplated applications.
- the substantially constant boiling azeotropic compositions are especially useful as refrigerants, heating applications, aerosol propellants, gaseous dielectrics, fire extmguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.
- novel azeotropic compositions of the present invention exhibit dew and bubble points with small pressure differentials.
- the difference between dew point and bubble point pressures is an indication of the constant boiling or azeotropic behavior of mixtures.
- the pressure differentials demonstrated by the substantially constant boiling compositions of the present invention are very small when compared with those of several known nonazeotropic, binary compositions.
- compositions which contain the same components as the true azeotrope, which not only will exhibit substantially equivalent properties as the true azeotrope for refrigerant and other applications but which will also exhibit substantially equivalent properties to the true azeotropic compositions in terms of constant boiling characteristics or tendency not to segregate or fractionate on boiling at other temperatures and pressures.
- Additives that are frequently incorporated in fluorocarbon compositions that can be added to the present compositions include lubricants, corrosion inhibitors, stabilizers and dyes.
- novel substantially constant boiling azeotropic compositions of this invention are also useful as aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.
- the fluorocarbon compositions described herein can be used to produce refrigeration by condensing the constant boiling azeotropic compositions and thereafter evaporating the compositions, e.g., condensate, in the vicinity of a body to be cooled. Further, these fluorocarbon compositions described herein can also be used to produce heat by condensing the constant boiling azeotropic compositions in the vicinity of a body to be heated and thereafter evaporating the compositions.
- substantially constant boiling azeotropic compositions of this invention eliminates the problem of component fractionation and handling in system operations because fluorocarbon compositions behave substantially as a single substance.
- the fluorocarbon compositions of the present invention have zero ozone depletion potentials compared with Refrigerant 502, which has a 0.25 ozone depletion potential.
- EXAMPLE 2 Mixtures of from 5-45 weight percent pentafluoroethane (HFC- 125) and 55-95 weight percent 1,1,1-trifluoroethane are prepared and the vapor pressure at -16.9° C and 30° C is measured. The pressures generated by the compositions are given below in Table 2.
- novel azeotropic compositions of the instant invention constituting a rather broad range of compositions and exhibit dew and bubble points with virtually no pressure differentials.
- the difference between dew point and bubble point pressures is an indication of the azeotrope-like behavior of mixtures.
- the pressure differentials demonstrated by the azeotropic mixtures of the instant invention are very small when compared with those of several known nonazeotropic, binary compositions, namely, (50+50) weight percent mixtures of pentafluoroethane (HFC-125) and 1,1,1,2- tetrafluoroethane (HFC- 134a) and chlorodifluoromethane (HCFC-22) and 1- chloro-l,l-difluoroethane (HCFC-142b), respectively, illustrated below.
- HFC-125 pentafluoroethane
- HFC- 134a 1,1,1,2- tetrafluoroethane
- HCFC-22 chlorodifluoromethane
- HCFC-142b 1- chloro-l,l-difluoroethane
- Net refrigeration effect is intended to mean the change in enthalpy of the refrigerant in the evaporator, i.e., the heat removed by the refrigerant in the evaporator.
- Coefficient of performance is intended to mean the ratio of the net refrigeration effect to the compressor work. It is a measure of refrigerant energy efficiency.
- the COP of the HFC-125/HFC-143a azeotrope in the amounts shown in Table 4 is similar to the COP of Refrigerant 502, the industry refrigerant standard, and better than that of pentafluoroethane (HFC-125).
- azeotropic compositions can also be used, with Uttle or no modification to existing refrigeration equipment, which was designed originally for Refrigerant 502 use.
- the present invention also provides compositions which surprisingly also have refrigeration characteristics substantially better than that of pentafluoroethane (HFC-125), the refrigerant currently recognized by the industry as the most plausible substitute for Refrigerant 502.
- the novel azeotropic mixtures have zero ozone depletion potentials compared with Refrigerant 502, which has a 0.25 ozone depletion potential.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Detergent Compositions (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Azeotropic compositions of 5-45 weight percent pentafluoroethane and 55-95 weight percent 1,1,1-trifluoroethane boil at -16.9 °C and a pressure of about 51 psia. These compositions are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.
Description
TITLE
MIXTURES OF PENTAPLUOROETHANE
AND TRIFLUOROETHANE
BACKGROUND OF THE INVENTION This invention relates to azeotropic compositions of pentafluoroethane and 1,1,1-trifluoroethane.
Recently the long-term environmental effects of chlorofluoro- carbons have come under scientific scrutiny, because it has been postulated that these materials because of their high stability are able to reach the stratosphere where under the influence of ultraviolet radiation release chlorine atoms which, in turn, undergo chemical reaction in the stratospheric ozone. Reduction of stratospheric ozone would increase the amount of ultraviolet radiation reaching the earth's surface.
In view of the potential environmental problem associated with stratospheric ozone depletion, there is a need for new materials possessing properties which make them useful substitutes for applications in which chlorofluorocarbons have been used and are environmentally safe. There is a limit to the number of single fluorinated hydrocarbon substances which can be candidates as environmentally safe materials. Mixtures of known fluorinated hydrocarbons, however, might be used if the desired combination or properties could be found in a given mixture. Simple mixtures, however, create problems in design and operation of refrigeration and other equipment because of component segregation in both the vapor and liquid phases. To avoid component segregation problems, it is particularly desirable to discover new substantially constant boiling fluorocarbon blends. Such blends should not suffer from component segregation problems. Unfortunately, it is not possible to predict the formation of constant boiling compositions, thus complicating the search for novel constant boiling compositions which possess the desired combination of properties. There is a need for substantially constant boiling compositions that have properties which make them particularly useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extmguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids and that are potentially environmentally safe.
SUMMARY OF THE INVENTION The present invention is directed to azeotropic compositions consisting essentially of about 5-45 weight percent, preferably about 4045 weight percent, pentafluoroethane, and 55-95 weight percent, preferably about 55-60 weight percent, 1,1,1-trifluoroethane, said composition boils at -16.9° C at about 51 psia. An especially preferred azeotrope consists essentially of 30 weight percent pentafluoroethane (CF3CHF2, boiling point = -48.5° C) and 70 weight percent 1,1,1-trifluoroethane (CF3CH3, boiling point = -47.6° C) , boiling at -16.9° C at about 51 psia. The novel compositions of the present invention exhibit lower vapor pressures than either of its two fluorocarbon constituents. The compositions described herein resist component segregation which would seriously diminish their usefulness in the contemplated applications. The substantially constant boiling azeotropic compositions are especially useful as refrigerants, heating applications, aerosol propellants, gaseous dielectrics, fire extmguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The fluorinated compounds which comprise these mixtures are identified in the industry as HFC-125 (pentafluoroethane) and HFC-143a (1,1,1- trifluoroethane) respectively, in nomenclature conventional to the halocarbon field.
A phase study on various mixtures of pentafluoroethane and 1,1,1- trifluoroethane containing different amounts of the fluorocarbons indicate that at constant temperature an azeotrope is formed over the composition range studied. Further studies for the evaluation of substantially constant boiling compositions containing a wide range of proportions of the fluorocarbon components resulted in resistance to component fractionation of the mixture so that the compositions are substantially constant boiling at constant temperature. The insignificantly small change in vapor pressure at constant temperature illustrates that the amount of separation and loss of one fluorocarbon component in excess amount that would substantially change the boiling temperature of the mixture does not occur, which makes the compositions suitable for the contemplated uses, especially as a refrigerant.
In addition, studies have further indicated that the novel azeotropic compositions of the present invention exhibit dew and bubble points with small pressure differentials. As is well known in the art, the difference between dew point and bubble point pressures is an indication of the constant boiling or azeotropic behavior of mixtures. The pressure differentials demonstrated by the substantially constant boiling compositions of the present invention are very small when compared with those of several known nonazeotropic, binary compositions.
As is well recognized in this field of technology, there is a range of compositions which contain the same components as the true azeotrope, which not only will exhibit substantially equivalent properties as the true azeotrope for refrigerant and other applications but which will also exhibit substantially equivalent properties to the true azeotropic compositions in terms of constant boiling characteristics or tendency not to segregate or fractionate on boiling at other temperatures and pressures.
Additives that are frequently incorporated in fluorocarbon compositions that can be added to the present compositions include lubricants, corrosion inhibitors, stabilizers and dyes.
In addition to refrigeration applications, the novel substantially constant boiling azeotropic compositions of this invention are also useful as aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.
The fluorocarbon compositions described herein can be used to produce refrigeration by condensing the constant boiling azeotropic compositions and thereafter evaporating the compositions, e.g., condensate, in the vicinity of a body to be cooled. Further, these fluorocarbon compositions described herein can also be used to produce heat by condensing the constant boiling azeotropic compositions in the vicinity of a body to be heated and thereafter evaporating the compositions.
The use of substantially constant boiling azeotropic compositions of this invention eliminates the problem of component fractionation and handling in system operations because fluorocarbon compositions behave substantially as a single substance. The fluorocarbon compositions of the present invention have zero ozone depletion potentials compared with Refrigerant 502, which has a 0.25 ozone depletion potential.
The following Examples further illustrate the invention wherein parts and percentages are by weight unless otherwise indicated.
EXAMPLE 1 A phase study was made on pentafluoroethane and 1,1,1- trifluoroethane wherein the composition was varied and the vapor pressures measured at a constant temperature of -16.9° C. An azeotropic composition was obtained, as evidenced by the minimum vapor pressure observed, and was identified as follows:
TABLE 1 Pentafluoroethane = 30.5 _+ 5 weight percent 1,1,1-Trifluoroethane = 69.5.+ 5 weight percent Vapor pressure = 51.1 psia at -16.9° C
EXAMPLE 2 Mixtures of from 5-45 weight percent pentafluoroethane (HFC- 125) and 55-95 weight percent 1,1,1-trifluoroethane are prepared and the vapor pressure at -16.9° C and 30° C is measured. The pressures generated by the compositions are given below in Table 2.
The novel azeotropic compositions of the instant invention constituting a rather broad range of compositions and exhibit dew and bubble
points with virtually no pressure differentials. As is well known in the art, the difference between dew point and bubble point pressures is an indication of the azeotrope-like behavior of mixtures. The pressure differentials demonstrated by the azeotropic mixtures of the instant invention are very small when compared with those of several known nonazeotropic, binary compositions, namely, (50+50) weight percent mixtures of pentafluoroethane (HFC-125) and 1,1,1,2- tetrafluoroethane (HFC- 134a) and chlorodifluoromethane (HCFC-22) and 1- chloro-l,l-difluoroethane (HCFC-142b), respectively, illustrated below. These data, which are shown in Table 3, confirm the azeotropic behavior of the compositions claimed in this invention.
TABLE 3
A comparison of the refrigeration properties of the azeotropic composition of the invention with both Refrigerant 502 and pentafluoroethane (HFC- 125), respectively, is shown in Table 4. These data were generated on a one-ton basis, that is, on the removal of heat from a space at the rate of 12,000 BTU/hr. A liquid line/suction line heat exchanger was used, with a return gas temperature of 65° F ( 18.3° C).
TABLE 4
Comparison of Refrigeration Performances
Weight Percentages HFC-125 & HFC-143a Refrig. 502 HFC-125 (5+95) (30,5+69,5) (45+55)
Evaporator
Temp., °F -30.0 -30.0 -30.0 -30.0 -30.0
Evaporator
Pressure, psia 23.10 27.6 27.28 27.01 26.73 Condenser
Temp., °F 115.0 115.0 115.0 115.0 115.0
Condenser Pressure, psia 278.68 337.8 302.94 307.66 311.42
Coefficient of Performance 1.88 1.65 1.91 1.86 1.83
Net Refrigeration Effect. BTU/lb 47.23 37.12 59.52 53.56 50.55
Net refrigeration effect is intended to mean the change in enthalpy of the refrigerant in the evaporator, i.e., the heat removed by the refrigerant in the evaporator.
Coefficient of performance (COP) is intended to mean the ratio of the net refrigeration effect to the compressor work. It is a measure of refrigerant energy efficiency.
For a refrigeration cycle typified by the above conditions, the COP of the HFC-125/HFC-143a azeotrope in the amounts shown in Table 4 is similar to the COP of Refrigerant 502, the industry refrigerant standard, and better than that of pentafluoroethane (HFC-125).
Having refrigeration characteristics similar to that of Refrigerant 502 is particularly desirable because the herein described azeotropic compositions can also be used, with Uttle or no modification to existing refrigeration equipment, which was designed originally for Refrigerant 502 use. Further, the present invention also provides compositions which surprisingly also have refrigeration characteristics substantially better than that of pentafluoroethane (HFC-125), the refrigerant currently recognized by the industry as the most plausible substitute for Refrigerant 502.
The novel azeotropic mixtures have zero ozone depletion potentials compared with Refrigerant 502, which has a 0.25 ozone depletion potential.
Claims
1. Azeotropic compositions comprising 5-45 weight percent pentafluoroethane and 55-95 weight percent 1,1,1-trifluoroethane that have a boiling point of - 16.9° C at a vapor pressure of about 51 psia.
2. An azeotropic composition of Claim 1 comprising about 40-45 weight percent pentafluoroethane and about 55-60 weight percent 1,1,1- trifluoroethane.
3. An azeotropic composition of Claim 1 comprising about 30 weight percent pentafluoroethane and about 70 weight percent 1,1,1- trifluoroethane.
4. A process for producing refrigeration which comprises condensing the composition of Claims 1, 2 or 3 and thereafter evaporating the composition in the vicinity of a body to be cooled.
5. A process for producing heat which comprises condensing the composition of Claims 1, 2 or 3 in the vicinity of a body to be heated and thereafter evaporating the composition.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP93915364A EP0648253A1 (en) | 1992-06-29 | 1993-06-22 | Mixtures of pentafluoroethane and trifluoroethane |
| AU45372/93A AU4537293A (en) | 1992-06-29 | 1993-06-22 | Mixtures of pentafluoroethane and trifluoroethane |
| JP6502429A JPH07508519A (en) | 1992-06-29 | 1993-06-22 | Mixture of pentafluoroethane and trifluoroethane |
| BR9306782A BR9306782A (en) | 1992-06-29 | 1993-06-22 | Aeotropic compositions processes for the production of refrigeration and heat |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90542492A | 1992-06-29 | 1992-06-29 | |
| US07/905,424 | 1992-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1994000528A1 true WO1994000528A1 (en) | 1994-01-06 |
Family
ID=25420789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1993/005721 WO1994000528A1 (en) | 1992-06-29 | 1993-06-22 | Mixtures of pentafluoroethane and trifluoroethane |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0648253A1 (en) |
| JP (1) | JPH07508519A (en) |
| AU (1) | AU4537293A (en) |
| BR (1) | BR9306782A (en) |
| CA (1) | CA2138249A1 (en) |
| MX (1) | MX9303872A (en) |
| RU (1) | RU94046275A (en) |
| WO (1) | WO1994000528A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996023752A1 (en) * | 1995-02-01 | 1996-08-08 | E.I. Du Pont De Nemours And Company | SEPARATING AND REMOVING IMPURITIES FROM 1,1,1-TRIFLUOROETHANE (HFC-143a) BY USING EXTRACTIVE DISTILLATION |
| WO1997019144A1 (en) * | 1994-11-17 | 1997-05-29 | Exxon Chemical Patents Inc. | Refrigeration working fluid compositions for use in recompression type cooling systems |
| US5993814A (en) * | 1993-09-12 | 1999-11-30 | Imperial College Of Science, Technology & Medicine | Agents for inhibition of chemoattractant |
| WO2005047418A1 (en) * | 2003-11-12 | 2005-05-26 | Zhejiang Lantian Environmental Protection Hi-Tech Co., Ltd. | Environmental refrigerant instead of r502 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943388A (en) * | 1989-06-28 | 1990-07-24 | Allied-Signal Inc. | Azeotrope-like compositions of pentafluoroethane; 1,1,1-trifluoroethane; and chlorodifluoromethane |
| WO1992001762A1 (en) * | 1990-07-26 | 1992-02-06 | E.I. Du Pont De Nemours And Company | Near-azeotropic blends for use as refrigerants |
| EP0522511A2 (en) * | 1991-07-12 | 1993-01-13 | Matsushita Electric Industrial Co., Ltd. | Working fluid |
| EP0526745A1 (en) * | 1991-07-08 | 1993-02-10 | Daikin Industries, Limited | Maximum boiling azeotropic composition and azeotropelike compositions |
-
1993
- 1993-06-22 EP EP93915364A patent/EP0648253A1/en not_active Withdrawn
- 1993-06-22 AU AU45372/93A patent/AU4537293A/en not_active Abandoned
- 1993-06-22 WO PCT/US1993/005721 patent/WO1994000528A1/en not_active Application Discontinuation
- 1993-06-22 JP JP6502429A patent/JPH07508519A/en active Pending
- 1993-06-22 CA CA 2138249 patent/CA2138249A1/en not_active Abandoned
- 1993-06-22 RU RU94046275/04A patent/RU94046275A/en unknown
- 1993-06-22 BR BR9306782A patent/BR9306782A/en not_active Application Discontinuation
- 1993-06-28 MX MX9303872A patent/MX9303872A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943388A (en) * | 1989-06-28 | 1990-07-24 | Allied-Signal Inc. | Azeotrope-like compositions of pentafluoroethane; 1,1,1-trifluoroethane; and chlorodifluoromethane |
| WO1992001762A1 (en) * | 1990-07-26 | 1992-02-06 | E.I. Du Pont De Nemours And Company | Near-azeotropic blends for use as refrigerants |
| EP0526745A1 (en) * | 1991-07-08 | 1993-02-10 | Daikin Industries, Limited | Maximum boiling azeotropic composition and azeotropelike compositions |
| EP0522511A2 (en) * | 1991-07-12 | 1993-01-13 | Matsushita Electric Industrial Co., Ltd. | Working fluid |
Non-Patent Citations (4)
| Title |
|---|
| DATABASE WPI Week 8920, Derwent Publications Ltd., London, GB; AN 89-148305 * |
| DATABASE WPI Week 9136, Derwent Publications Ltd., London, GB; AN 91-262356 * |
| DATABASE WPI Week 9136, Derwent Publications Ltd., London, GB; AN 91-262358 * |
| DATABASE WPI Week 9321, Derwent Publications Ltd., London, GB; AN 93-175387 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5993814A (en) * | 1993-09-12 | 1999-11-30 | Imperial College Of Science, Technology & Medicine | Agents for inhibition of chemoattractant |
| WO1997019144A1 (en) * | 1994-11-17 | 1997-05-29 | Exxon Chemical Patents Inc. | Refrigeration working fluid compositions for use in recompression type cooling systems |
| WO1996023752A1 (en) * | 1995-02-01 | 1996-08-08 | E.I. Du Pont De Nemours And Company | SEPARATING AND REMOVING IMPURITIES FROM 1,1,1-TRIFLUOROETHANE (HFC-143a) BY USING EXTRACTIVE DISTILLATION |
| US5830325A (en) * | 1995-02-01 | 1998-11-03 | E. I. Du Pont De Nemours And Company | Separating and removing 1, 1, 1-trifluoroethane by using azeotropic distillation |
| WO2005047418A1 (en) * | 2003-11-12 | 2005-05-26 | Zhejiang Lantian Environmental Protection Hi-Tech Co., Ltd. | Environmental refrigerant instead of r502 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07508519A (en) | 1995-09-21 |
| AU4537293A (en) | 1994-01-24 |
| EP0648253A1 (en) | 1995-04-19 |
| CA2138249A1 (en) | 1994-01-06 |
| BR9306782A (en) | 1998-12-08 |
| MX9303872A (en) | 1993-12-01 |
| RU94046275A (en) | 1996-09-27 |
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