US5080823A
Expired / Lapsed
US
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Azeotropic mixture with 1,1,1-trifluoroethane and propane a low boiling point and its applicatons as a refrigerant fluid, as an aerosol propellant, or as a blowing agent for plastic foams
Assignee: Arkema France SA
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Filing: 1991-04-02
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Granted: 1992-01-14
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Expires: 2011-04-02
Abstract
Abstract The invention relates to an azeotrope with a minimum boiling point, capable of being employed as a refrigerating fluid replacing trifluorobromomethane (Halon 1301) in industrial refrigeration systems at very low temperature with single-stage compression. The azeotrope according to the invention is a mixture of 1,1,1-trifluoroethane (HFA 143a) and of propane (R290). At the normal boiling point (approximately -53.4° C. at 1.013 bars), its 1,1,1-trifluoroethane content is approximately 70.6 mass % and that of propane 29.4 %. This azeotrope can also be employed as an aerosol propellant or as a blowing agent for plastic foams.
Inventors
- 👤 Didier Arnaud
- 👤 Jean C. Tanguy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:24
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C07; C07C; C07C19/00; C07C19/08; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C09K3/00; C09K3/30; C08J2207/00; C08J2207/04; C09K2205/00; C09K2205/10; C09K2205/12; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
44 words
Minimum boiling point azeotrope consisting of a mixture of about 50 to 80 mass% 1,1,1-trifluoroethane and the balance propane, propane and at its normal boiling point of approximately 70.6 mass% of 1,1,1-trifluoroethane and containing approximately 70.6 mass% of 1,1,1-trifluoroethane and 29.4 mass% of propane.
Claim 2
Dependent Claim
44 words
Minimum boiling point azeotrope consisting of a mixture of about 50 to 80 mass% 1,1,1-trifluoroethane and the balance propane, propane and at its normal boiling point of approximately 70.6 mass% of 1,1,1-trifluoroethane and containing approximately 70.6 mass% of 1,1,1-trifluoroethane and 29.4 mass% of propane.
Claim 3
Dependent Claim
13 words
A method of refrigeration comprising condensing and evaporating the azeotrope of claim 1.
Claim 4
Dependent Claim
15 words
A method of preparing an aerosol wherein the propellant is the azeotrope of claim 1.
Claim 5
Dependent Claim
16 words
A method of manufacturing plastic foams wherein the blowing agent is the azeotrope of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |