US5004559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxyalkylene-polysiloxane block copolymers as demulsifiers for water-containing oil
Assignee: Evonik Operations GmbH
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Filing: 1988-11-16
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Granted: 1991-04-02
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Expires: 2008-11-16
Abstract
Abstract To demulsify water-containing crude oil, selected polyoxyalkylene-polysiloxane block copolymers are described. The demulsifiers are used in amounts of less than 200 ppm based on the crude oil.
Inventors
- 👤 Gotz Koerner
- 👤 Dietmar Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:43
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/04; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; C08; C08G; C08G77/00; C08G77/42; C08G77/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A method of demulsifying water-containing crude oil emulsions, which comprises admixing the water-containing crude oil with an effective amount to demulsify of a polyoxyalkylene-polysiloxane mixed block polymer of the general formula ##STR6## wherein R 1 is alkyl with 6 to 28 carbon atoms; R 2 is a polyether of the general formula -M-(C.sub.2 H.sub.4 O).sub.x (C.sub.3 H.sub.6 O).sub.y R.sup.3 wherein M is an alkyleneoxy group with up to 4 carbon atoms or an oxygen atom, R 3 is hydrogen, alkyl with 1 to 4 carbon atoms, acyloxy or trimethylsilyl, x and y are whole numbers, which are selected so that the molecular weight of the R 2 group is not greater than 1,000, the ratio by weight of oxyethylene to oxypropylene groups being 100:0 to 50:50, m=0 to 20. n=10 to 50 and o=10 to 50.
Claim 2
Independent Claim
136 words
A method of demulsifying water-containing crude oil emulsions, which comprises admixing the water-containing crude oil with an effective amount to demulsify of a polyoxyalkylene-polysiloxane mixed block polymer of the general formula ##STR6## wherein R 1 is alkyl with 6 to 28 carbon atoms; R 2 is a polyether of the general formula -M-(C.sub.2 H.sub.4 O).sub.x (C.sub.3 H.sub.6 O).sub.y R.sup.3 wherein M is an alkyleneoxy group with up to 4 carbon atoms or an oxygen atom, R 3 is hydrogen, alkyl with 1 to 4 carbon atoms, acyloxy or trimethylsilyl, x and y are whole numbers, which are selected so that the molecular weight of the R 2 group is not greater than 1,000, the ratio by weight of oxyethylene to oxypropylene groups being 100:0 to 50:50, m=0 to 20. n=10 to 50 and o=10 to 50.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said effective amount is less than 200 ppm.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein said effective amount is between about 10-200 ppm.
References Cited (Backward Citations)
GB1194111A
Cited
GB1206698A
Cited
US4183820A
Cited
EP0059037A1
Cited
US4514319A
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EP0125779A2
Cited
EP0141585A2
Cited
US4596653A
Cited
EP0167361A2
Cited
US4711714A
Cited
US4854938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |