Patent US3995097A successfully refreshed from Google Patents.
US3995097A
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Prevention of fouling in polymerization reactors
Assignee: Phillips Petroleum Co
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Filing: 1975-09-15
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Granted: 1976-11-30
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Expires: 1995-09-15
Abstract
Abstract An olefin is polymerized in a hydrocarbon diluent in a turbulent reaction zone to produce particles of polymer which are substantially insoluble in the diluent. Fouling of the reactor by adherence of polymer particles to the walls of the reactor is reduced by adding to the reaction medium a composition which comprises a mixture of an aluminum or chromium salt of an alkyl salicylic acid and an alkali metal alkyl sulfosuccinate.
Inventors
- 👤 Terry D. Brown
- 👤 Marion T. O'Shaughnessy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:40
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/1812; B01J19/1837; B01J19/0006; B01J19/002; C; C08; C08F; C08F10/00; C08F2/00; C08F2/002; C08F2/005; C08F2/04; C08F2/06; B01J2208/00; B01J2208/00008; B01J2208/00734; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00105; B01J2219/00114; B01J2219/00245; B01J2219/00254; C08F10/02; C08F110/00; C08F110/02; C08F210/00; C08F210/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
In a process in which at least one olefin is polymerized in a hydrocarbon diluent in a turbulent reaction zone to produce particles of polymer which are substantially insoluble in the diluent; the method of reducing adherence of polymer particles to the walls of the reaction zone which comprises adding to the reaction medium a composition comprising (1) at least one aluminum or chromium salt of an alkyl salicylic acid and (2) at least one alkali metal alkyl sulfosuccinate.
Claim 2
Dependent Claim
79 words
In a process in which at least one olefin is polymerized in a hydrocarbon diluent in a turbulent reaction zone to produce particles of polymer which are substantially insoluble in the diluent; the method of reducing adherence of polymer particles to the walls of the reaction zone which comprises adding to the reaction medium a composition comprising (1) at least one aluminum or chromium salt of an alkyl salicylic acid and (2) at least one alkali metal alkyl sulfosuccinate.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said composition is added to the reaction medium in the range of about 0.1 to 100 parts per million by weight.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein the alkyl group of salicylic acid contains 10 to 18 carbon atoms and the alkyl group of the sulfosuccinate contains 8 to 18 carbon atoms.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein (1) is aluminum salts of mono- and dihexadecylsalicylic acid and (2) is sodium dioctylsulfosuccinate.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein (1) and (2) are employed in a molar ratio of 10:1 to 1:10.
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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) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |