US4711714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the separation of gas from oil
Assignee: BP PLC
•
Filing: 1985-06-21
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Granted: 1987-12-08
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Expires: 2005-06-21
Abstract
Abstract Water-insoluble polyoxyalkylene graft copolymers are effective anti-foam agents for reducing foaming in crude oil/gas separators. The copolymers are of formula: ##STR1## wherein R is an ethylene, propylene or butene group or a mixture thereof; R' is a hydrocarbyl group containing 1 to 8 carbon atoms; R" is a hydroxyl group, an alkoxy group or an alkyl group containing 1 to 8 carbon atoms; (a) is a number in the range 100 to 250; (b) is a number in the range 1 to 6; (c) is a number in the range 1 to 10; and (d) is a number in the range 10 to 100. They are particularly useful in breaking microgas dispersions and foams resulting from crude oils with a high gas to oil ratio.
Inventors
- 👤 Ian C. Callaghan
- 👤 Clive M. Gould
- 👤 Wojciech Grabowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:10
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A method for separating crude oil containing associated gas into liquid oil and free gas in the presence of an anti-foam agent characterised by the fact that the anti-foam agent is a water-insoluble polysiloxane polyoxyalkylene graft copolymer ##STR5## wherein R is an ethylene, propylene or butene group or a mixture thereof; R' is a hydrocarbyl group containing 1 to 8 carbon atoms; R" is a hydroxyl group, an alkoxy group or an alkyl group containing 1 to 8 carbon atoms; (a) is a number in the range of 100 to 250; (b) is a number in the range of 1 to 6; (c) is a number in the range of 1 to 10; and (d) is a number in the range 10 to 100.
Claim 2
Independent Claim
124 words
A method for separating crude oil containing associated gas into liquid oil and free gas in the presence of an anti-foam agent characterised by the fact that the anti-foam agent is a water-insoluble polysiloxane polyoxyalkylene graft copolymer ##STR5## wherein R is an ethylene, propylene or butene group or a mixture thereof; R' is a hydrocarbyl group containing 1 to 8 carbon atoms; R" is a hydroxyl group, an alkoxy group or an alkyl group containing 1 to 8 carbon atoms; (a) is a number in the range of 100 to 250; (b) is a number in the range of 1 to 6; (c) is a number in the range of 1 to 10; and (d) is a number in the range 10 to 100.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein the ratio of (a) to (d) is in the range 2:1 to 15:1.
Claim 4
Dependent Claim
12 words
A method according to claim 1 wherein R is an ethylene group.
Claim 5
Dependent Claim
12 words
A method according to claim 1 wherein R' is a methyl group.
Claim 6
Dependent Claim
12 words
A method according to claim 1 wherein R" is a hydroxyl group.
Claim 7
Dependent Claim
22 words
A method according to claim 5 wherein the ratio of silicon atoms to hydroxyl groups is in the range 2:1 to 16:1.
Claim 8
Dependent Claim
20 words
A method according to claim 1 wherein the siloxane content of the copolymer is in the range 30-70% by weight.
Claim 9
Dependent Claim
24 words
A method according to claim 1 wherein the copolymer is present in amount 0.1 to 20 ppm expressed on the basis of active ingredient.
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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) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |