Patent US4457371A successfully refreshed from Google Patents.
US4457371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for demulsification of bitumen emulsions
Assignee: Texaco Inc
•
Filing: 1981-12-02
•
Granted: 1984-07-03
•
Expires: 2001-12-02
Abstract
Abstract A process for recovering bitumen from oil-in-water (O/W) emulsions is disclosed wherein water soluble demulsifiers are used. These demulsifiers are polymers of specific quaternary ammonium monomers or co-polymers of these quaternary ammonium monomers wth other types of monomers wherein the greater portion of the co-polymer is comprised of the quaternary ammonium monomers. To resolve the bituminous petroleum emulsions, the process is carried out between 25° and 160° C. wherein the demulsifier of the invention is contacted with the bituminous emulsion.
Inventors
- 👤 David R. McCoy
- 👤 Edward E. McEntire
- 👤 Robert M. Gipson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:02
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/04; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; E; E21; E21B; E21B43/00; E21B43/34; E21B43/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A process for recovering petroleum from O/W bitumen emulsions by demulsifying said emulsions by adding thereto demulsifiers comprising co-polymers of monomers having the general structure ##STR5## where=H or lower alkyl, X=NH or O, n=>1, R 1 and R 2 =alkyl, R 3 =alkyl, alkenyl, alkylaryl, or hydroxyalkyl, and Y=an anion wherein the co-polymer contained about 60% or greater of said monomer.
Claim 2
Dependent Claim
61 words
A process for recovering petroleum from O/W bitumen emulsions by demulsifying said emulsions by adding thereto demulsifiers comprising co-polymers of monomers having the general structure ##STR5## where=H or lower alkyl, X=NH or O, n=>1, R 1 and R 2 =alkyl, R 3 =alkyl, alkenyl, alkylaryl, or hydroxyalkyl, and Y=an anion wherein the co-polymer contained about 60% or greater of said monomer.
Claim 3
Dependent Claim
71 words
A process for recovering petroleum from O/W bitumen emulsions by demulsifying said emulsions by adding thereto demulsifiers comprising co-polymers of monomers having the general structure ##STR6## where R=CH 3 , X=NH or O, n has a value from 2 to 3, and R 1 and R 2 =CH 3 , R 3 =alkyl, alkenyl, alkylaryl or hydroxyalkyl and Y=an anion wherein the co-polymer contained about 60% or greater of said monomer.
Claim 4
Dependent Claim
71 words
A process for recovering petroleum from O/W bitumen emulsions by demulsifying said emulsions by adding thereto demulsifiers comprising co-polymers of monomers having the general structure ##STR6## where R=CH 3 , X=NH or O, n has a value from 2 to 3, and R 1 and R 2 =CH 3 , R 3 =alkyl, alkenyl, alkylaryl or hydroxyalkyl and Y=an anion wherein the co-polymer contained about 60% or greater of said monomer.
References Cited (Backward Citations)
US2995512A
Cited
US2915476A
Cited
US3691086A
Cited
US4154698A
Cited
US4127170A
Cited
US4160742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |