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Patent US4612133A successfully refreshed from Google Patents.
US4612133A
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US
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Stable mixtures of chlorofluorocarbons and solvents and their use as heat transfer fluids
Assignee: Arkema France SA
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Filing: 1985-07-03
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Granted: 1986-09-16
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Expires: 2005-07-03
Abstract
Abstract Compositions for use as fluids in absorption heat pumps, which compositions comprise a chlorofluoro-hydrocarbon heat exchange fluid, an amide or glycol-ether solvent vehicle, and at least one metal salt of an alkylarylsulfonate which stabilizes the fluid against decomposition, together with use of the compositions in absorption heat pumps.
Inventors
- 👤 Rene Bertocchio
- 👤 Bernard Genest
- 👤 Henri Mathais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:32
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/047
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
A stable heat exchange medium for use in absorption type heat pumps, which medium comprises from ten to sixty percent by weight of the composition of a chlorofluoro-hydrocarbon heat exchange fluid, amide or glycol-ether solvent, and an from 0.05 to 2.5 percent of the weight of the solvent of at least one metal salt of an alkylarylsulfonate to stabilize the fluid against thermal decomposition.
Claim 2
Dependent Claim
64 words
A stable heat exchange medium for use in absorption type heat pumps, which medium comprises from ten to sixty percent by weight of the composition of a chlorofluoro-hydrocarbon heat exchange fluid, amide or glycol-ether solvent, and an from 0.05 to 2.5 percent of the weight of the solvent of at least one metal salt of an alkylarylsulfonate to stabilize the fluid against thermal decomposition.
Claim 3
Dependent Claim
71 words
A heat exchange medium according to claim 1 wherein the metal salt has the formula (R m -Ar-SO 3 ) n M, where R is a straight-or branched-chain alkyl group containing from one to 15 carbon atoms, m is one, two, or three, Ar is an aromatic group containing one or more aromatic rings, M is a metal atom, and n is an integer corresponding to the valence of the metal.
Claim 4
Dependent Claim
23 words
A heat exchange medium according to claim 2 wherein n is one or two and M is zinc or an alkaline earth metal.
Claim 5
Dependent Claim
22 words
A heat exchange medium according to claim 1 wherein the metal salt is calcium dodecylbenzene sulfonate or barium or zinc dinonylnaphthalene sulfonate.
Claim 6
Dependent Claim
27 words
A heat exchange medium according to claim 1 wherein the amount of the metal salt is from 0.5 to two percent of the weight of the solvent.
Claim 7
Dependent Claim
28 words
A heat exchange medium according to claim 1 wherein the chlorofluoro-hydrocarbon is chlorodifluoromethane, dichlorofluoromethane, chlorofluoromethane, 1,1-dichloro-2,2,2-trifluoroethane, 1-chloro-1,2,2,2-tetrafluoroethane, 1,1-dichloro-2,2-difluoroethane, 1-chloro-2,2,2-trifluoroethane, 1-chloro-2,2-difluoroethane, 1-chloro-1,2,2-trifluoroethane, or mixtures of two or more thereof.
Claim 8
Dependent Claim
33 words
A heat exchange medium according to claim 1 wherein the solvent is N,N-dimethylformamide, N,N-diethylformamide, N-methylpyrrolidone, N,N-dimethylpropionamide, the dimethylether of triethylene glycol, the dimethylether of tetraethylene glycol, or mixtures of two or more thereof.
Claim 9
Dependent Claim
20 words
A heat exchange medium according to claim 1 wherein the chlorofluoro-hydrocarbon is 1-chloro-2,2,2-trifluoroethane or 1-chloro-1,2,2,2-tetrafluoroethane and the solvent is N-methylpyrrolidone.
Claim 10
Independent Claim
145 words
A method for transferring heat in absorption type heat pump systems which comprises using as the heat exchange medium a chlorofluoro-hydrocarbon heat exchange fluid, an amide or glycolether solvent, and an amount of at least one metal salt of an alkylarylsulfonate to stabilize the fluid against thermal decomposition, the metal salt having the formula (R m -Ar-SO 3 ) n M, where R is a straight- or branched-chain alkyl group containing from one to 15 carbon atoms, m is one, two, or three, Ar is an aromatic group containing one or more aromatic rings, M is a metal atom, and n is an integer corresponding to the valence of the metal wherein the chlorofluoro-hydrocarbon fluid is from ten to sixty percent by weight of the composition and the amount of the metal salt is from 0.05 to 2.5 percent of the weight of the solvent.
Claim 11
Independent Claim
145 words
A method for transferring heat in absorption type heat pump systems which comprises using as the heat exchange medium a chlorofluoro-hydrocarbon heat exchange fluid, an amide or glycolether solvent, and an amount of at least one metal salt of an alkylarylsulfonate to stabilize the fluid against thermal decomposition, the metal salt having the formula (R m -Ar-SO 3 ) n M, where R is a straight- or branched-chain alkyl group containing from one to 15 carbon atoms, m is one, two, or three, Ar is an aromatic group containing one or more aromatic rings, M is a metal atom, and n is an integer corresponding to the valence of the metal wherein the chlorofluoro-hydrocarbon fluid is from ten to sixty percent by weight of the composition and the amount of the metal salt is from 0.05 to 2.5 percent of the weight of the solvent.
Claim 12
Dependent Claim
26 words
A method according to claim 9 wherein the chlorofluoro-hydrocarbon is chlorodifluoromethane, dichlorofluoromethane, chlorofluoromethane, 1,1-dichloro-2,2,2-trifluoroethane, 1-chloro-1,2,2,2-tetrafluoroethane, 1,1-dichloro-2,2-difluoroethane, 1-chloro-2,2,2-trifluoroethane, 1-chloro-2,2-difluoroethane, 1-chloro-1,2,2-trifluoroethane, or mixtures of two or more thereof.
Claim 13
Dependent Claim
31 words
A method according to claim 9 wherein the solvent is N,N-dimethylformamide, N,N-diethylformamide, N-methylpyrrolidone, N,N-dimethylpropionamide, the dimethylether of triethylene glycol, the dimethylether of tetraethylene glycol, or mixtures of two or more thereof.
Claim 14
Dependent Claim
20 words
A method according to claim 9 the solvent is the dimethylether of triethylene glycol or the dimethylether of tetraethylene glycol.
Claim 15
Dependent Claim
28 words
A method according to claim 9 wherein the chlorofluoro-hydrocarbon is 1-chloro-1,2,2,2-tetrafluoroethane, the solvent is N-methylpyrrolidone, and the stabilizer is barium or zinc dinonylnaphthalene sulfonate or calcium dodecylbenzene sulfonate.
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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |