US5093002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membrane process for treating a mixture containing dewaxed oil and dewaxing solvent
Assignee: Texaco Inc
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Filing: 1991-07-05
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Granted: 1992-03-03
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Expires: 2011-07-05
Abstract
Abstract Charge containing dewaxed oil and dewaxing solvent (typically methyl ethyl ketone and toluene) is treated to separate dewaxing solvent by use of a separating elastomer membrane barrier of a polysiloxane which has been cross-linked as with toluene diisocyanate, adipoyl dichloride, a dialkoxy silane, or a diacetoxy silane.
Inventors
- 👤 Mordechai Pasternak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:18
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D71/00; B01D71/06; B01D71/70; B01D71/701; C; C08; C08G; C08G77/00; C08G77/48; C10; C10G; C10G31/00; C10G31/11
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
An elastomer membrane, which comprises a non-porous elastomer membrane layer of a polysiloxane which has been cross-linked with, as cross-linking agent, a polyisocyanate, (ii) a poly(carbonyl chloride), or (iii) a silane R 4-a Si(A) a wherein A is --OH, --NH 2 , --OR, or --OOCR, a is 2, 3, or 4, and R is hydrogen or an alkyl, aralkyl, cycloalkyl, aryl, or alkaryl group, in proportions sufficient for providing properties enabling effective separation of dewaxing solvent and dewaxed oil.
Claim 2
Dependent Claim
79 words
An elastomer membrane, which comprises a non-porous elastomer membrane layer of a polysiloxane which has been cross-linked with, as cross-linking agent, a polyisocyanate, (ii) a poly(carbonyl chloride), or (iii) a silane R 4-a Si(A) a wherein A is --OH, --NH 2 , --OR, or --OOCR, a is 2, 3, or 4, and R is hydrogen or an alkyl, aralkyl, cycloalkyl, aryl, or alkaryl group, in proportions sufficient for providing properties enabling effective separation of dewaxing solvent and dewaxed oil.
Claim 3
Dependent Claim
14 words
A membrane as claimed in claim 1 wherein said polysiloxane is a cyclic polysiloxane.
Claim 4
Dependent Claim
14 words
A membrane as claimed in claim 1 wherein said polysiloxane is a linear polysiloxane.
Claim 5
Dependent Claim
15 words
A membrane as claimed in claim 1 wherein said polysiloxane is a silanol-terminated linear polysiloxane.
Claim 6
Dependent Claim
22 words
A membrane as claimed in claim 1 wherein said polysiloxane is a silanol-terminated linear dimethyl siloxane of molecular weight Mn of 550-4,200.
Claim 7
Dependent Claim
16 words
A membrane as claimed in claim 1 wherein said polysiloxane said cross-linking agent is a polyisocyanate.
Claim 8
Dependent Claim
15 words
A membrane as claimed in claim 1 wherein said cross-linking agent is a toluene diisocyanate.
Claim 9
Dependent Claim
15 words
A membrane as claimed in claim 1 wherein said cross-linking agent is a poly(carbonyl chloride).
Claim 10
Dependent Claim
14 words
A membrane as claimed in claim 1 wherein said cross-linking agent is adipoyl dichloride.
Claim 11
Dependent Claim
40 words
A membrane as claimed in claim 1 wherein said cross-linking agent is R 4-a Si(A) wherein A is --OR or --OOCR, a is 2, 3, or 4, and R is hydrogen or an alkyl, aralkyl, cycloalkyl, aryl, or alkaryl group.
Claim 12
Dependent Claim
15 words
A membrane as claimed in claim 1 wherein said cross-linking agent is dimethyl diacetoxy silane.
References Cited (Backward Citations)
US4605526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |