US4517097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for diluting aqueous polymer solutions
Assignee: Marathon Oil Co
•
Filing: 1984-02-16
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Granted: 1985-05-14
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Expires: 2004-02-16
Abstract
Abstract A process for preventing, or at least substantially reducing, scaling in an aqueous polymer dilution apparatus by injecting carbon dioxide gas into the solution to maintain the pH of the solution in a range which tends to hold scale forming substances in solution.
Inventors
- 👤 LaVaun S. Merrill, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:26
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; Y; Y10; Y10S; Y10S422/00; Y10S422/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A process for preventing, or at least substantially reducing, scaling in apparatus used for diluting an aqueous solution of a partially hydrolyzed polyacrylamide which solution contains scale forming substances, comprising the step of introducing carbon dioxide gas into the solution in an amount sufficient to maintain the pH of the solution at a level which acts to keep scale forming substances in solution during dilution.
Claim 2
Dependent Claim
65 words
A process for preventing, or at least substantially reducing, scaling in apparatus used for diluting an aqueous solution of a partially hydrolyzed polyacrylamide which solution contains scale forming substances, comprising the step of introducing carbon dioxide gas into the solution in an amount sufficient to maintain the pH of the solution at a level which acts to keep scale forming substances in solution during dilution.
Claim 3
Dependent Claim
27 words
A process according to claim 1 wherein the carbon dioxide gas is injected into the diluent employed to dilute the aqueous solution of the partially hydrolyzed polyacrylamide.
Claim 4
Dependent Claim
11 words
A process according to claim 2 wherein the diluent is water.
Claim 5
Dependent Claim
23 words
A process according to claim 1 wherein the carbon dioxide gas is injected directly into the aqueous solution of the partially hydrolyzed polyacrylamide.
Claim 6
Dependent Claim
22 words
A process according to claim 1 wherein sufficient carbon dioxide gas is introduced to at least saturate the partially hydrolyzed polyacrylamide solution.
Claim 7
Dependent Claim
34 words
A process according to claim 1 wherein sufficient carbon dioxide gas is introduced to maintain the pH of the solution at a level of about 6.5 to about 8.5 during dilution of the solution.
Claim 8
Dependent Claim
25 words
A process according to claim 1 wherein the solution is maintained at a pH of about 6 to about 7 during dilution of the solution.
References Cited (Backward Citations)
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Cited
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US3218241A
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JPS5232088A
Cited
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US4402916A
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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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |