US5792383A
Expired / Lapsed
US
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Reduction of enterfacial tension between hydrocarbon lubricant and immiscible liquid refrigerant
Assignee: Witco Corp
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Filing: 1994-09-07
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Granted: 1998-08-11
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Expires: 2014-09-07
Abstract
Abstract Fluid refrigeration compositions comprising a hydrocarbon lubricant, an immiscible refrigerant and an additive capable of reducing the interfacial tension between the hydrocarbon lubricant and refrigerant.
Inventors
- 👤 Jose L. Reyes-Gavilan
- 👤 Alan D. Eckard
- 👤 G. Thomas Flak
- 👤 Todd R. Tritcak
- 👤 Leonard Aconsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:22
CPC Classifications
C; C10; C10M; C10M129/00; C10M129/02; C10M129/04; C10M129/06; C10M129/08; C10M131/00; C10M131/02; C10M131/08; C10M131/10; C10M131/12; C10M169/00; C10M169/04; C10M171/00; C10M171/008; C10M2203/00; C10M2203/06; C10M2203/065; C10M2203/10; C10M2203/1006; C10M2203/102; C10M2203/1025; C10M2203/104; C10M2203/1045; C10M2203/106; C10M2203/1065; C10M2203/108; C10M2203/1085; C10M2205/00; C10M2205/02; C10M2205/0206; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/023; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/122; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/2835; C10M2207/286; C10M2207/30; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/04; C10M2211/044; C10M2211/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2219/08; C10M2219/082; C10M2219/085; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10M2223/043
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
102 words
A fluid refrigeration composition comprising a hydrocarbon lubricant, a fluorohydrocarbon refrigerant immiscible with the hydrocarbon lubricant which contains at least one carbon atom and all the halogen groups of the fluorohydrocarbon are fluorine, and an effective amount of additive which reduces the interfacial tension at the interface between the hydrocarbon lubricant and the refrigerant in liquid form to the point where the spreading coefficient(s) refrigerant liquid on steel is slightly positive enabling the refrigerant to displace hydrocarbon lubricant from steel wherein said additive is present in a concentration of 0.001 to 5 parts by weight per 100 parts by weight hydrocarbon lubricant.
Claim 2
Dependent Claim
102 words
A fluid refrigeration composition comprising a hydrocarbon lubricant, a fluorohydrocarbon refrigerant immiscible with the hydrocarbon lubricant which contains at least one carbon atom and all the halogen groups of the fluorohydrocarbon are fluorine, and an effective amount of additive which reduces the interfacial tension at the interface between the hydrocarbon lubricant and the refrigerant in liquid form to the point where the spreading coefficient(s) refrigerant liquid on steel is slightly positive enabling the refrigerant to displace hydrocarbon lubricant from steel wherein said additive is present in a concentration of 0.001 to 5 parts by weight per 100 parts by weight hydrocarbon lubricant.
Claim 3
Dependent Claim
14 words
The composition of claim 1, wherein the hydrocarbon lubricant comprises a paraffinic mineral oil.
Claim 4
Dependent Claim
13 words
The composition of claim 1, wherein the hydrocarbon lubricant comprises a naphthenic oil.
Claim 5
Dependent Claim
13 words
The composition of claim 1, wherein the hydrocarbon lubricant comprises an alkylbenzene oil.
Claim 6
Dependent Claim
12 words
The composition of claim 1, wherein the hydrocarbon lubricant comprises a polyalfaolefin.
Claim 7
Dependent Claim
25 words
The composition of claim 1, wherein the hydrocarbon lubricant comprises a major amount of naphthenic mineral oil and a minor amount of an alkylbenzene oil.
Claim 8
Dependent Claim
11 words
The composition of claim 1, wherein the fluorohydrocarbon comprises 1,1,1, 2-tetrafluoroethane.
Claim 9
Dependent Claim
10 words
The composition of claim 1, wherein the fluorohydrocarbon comprises pentafluoroethane.
Claim 10
Dependent Claim
11 words
The composition of claim 1, wherein said composition also comprises difluoromonochloromethane.
Claim 11
Dependent Claim
11 words
The composition of claim 1, wherein the additive comprises a surfactant.
Claim 12
Dependent Claim
10 words
The composition of claim 10, wherein the surfactant comprises 2,4,7,9-tetramethyl-5-decyne-4,7-diol.
Claim 13
Dependent Claim
11 words
The composition of claim 10, wherein the surfactant comprises a fluoroester.
Claim 14
Dependent Claim
21 words
The composition of claim 1, wherein the refrigerant is immiscible over the whole temperature range of -40° C. to 80° C.
Claim 15
Dependent Claim
102 words
A fluid refrigeration composition comprising a hydrocarbon lubricant comprising at least one member selected from the group consisting of paraffinic mineral oil, naphthenic mineral oil, alkylbenzene oil, and polyalfaolefin, a refrigerant immiscible with the hydrocarbon lubricant containing at least one carbon atom and one fluorine atom, and an effective amount of a surface active agent comprising at least one member selected from the group consisting of 2,4,7,9-tetramethyl-5-decyne-4, 7-diol and fluoroester which reduces the interfacial tension between the hydrocarbon lubricant and the refrigerant in liquid form such that the refrigerant can displace the lubricant from the inner surfaces of heat exchangers and lines.
Claim 16
Dependent Claim
102 words
A fluid refrigeration composition comprising a hydrocarbon lubricant comprising at least one member selected from the group consisting of paraffinic mineral oil, naphthenic mineral oil, alkylbenzene oil, and polyalfaolefin, a refrigerant immiscible with the hydrocarbon lubricant containing at least one carbon atom and one fluorine atom, and an effective amount of a surface active agent comprising at least one member selected from the group consisting of 2,4,7,9-tetramethyl-5-decyne-4, 7-diol and fluoroester which reduces the interfacial tension between the hydrocarbon lubricant and the refrigerant in liquid form such that the refrigerant can displace the lubricant from the inner surfaces of heat exchangers and lines.
Claim 17
Dependent Claim
21 words
The composition of claim 14, wherein the refrigerant comprises a fluorohydrocarbon wherein all the halogen groups of the fluorohydrocarbon are fluorine.
Claim 18
Dependent Claim
12 words
The composition of claim 15, wherein the surface active agent comprises 2,4,7,9-tetramethyl-5-decyne-4,7-diol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-10 | 2002-02-09 | 2002-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-10 | 2006-02-09 | 2006-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-10 | 2010-02-09 | 2010-08-11 | $7700.00 | Window Closed / Lapsed |