Patent US4383927A successfully refreshed from Google Patents.
US4383927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of oil from oily sludges
Assignee: ChampionX LLC
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Filing: 1982-03-08
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Granted: 1983-05-17
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Expires: 2002-03-08
Abstract
Abstract A process is provided for enhancing oil recovery from an oily sludge containing a solid phase, an oil phase and a water phase by adding a positively charged latex flocculant to such sludge and immediately thereafter adding a chemical emulsion breaker which is negatively charged or nonionic, while controlling the proportions of said flocculant and said emulsion breaker to cause the entrapped oil phase to detach from the floc surface of the adsorptive solids and go into the water phase, and mechanically separating the oil from the solids and water.
Inventors
- 👤 Sanjay R. Srivatsa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:59
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/04; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/547
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A process for enhancing oil recovery from an oily sludge containing a solid phase, an oil phase and a water phase which consists essentially in adding a positively charged latex flocculant to such sludge and immediately thereafter adding a chemical emulsion breaker which is negatively charged or nonionic, while controlling the proportions of said flocculant and said emulsion breaker to cause the entrapped oil phase to detach from the floc surface of the adsorptive solids and go into the water phase, and mechanically separating the oil from the solids and water.
Claim 2
Dependent Claim
91 words
A process for enhancing oil recovery from an oily sludge containing a solid phase, an oil phase and a water phase which consists essentially in adding a positively charged latex flocculant to such sludge and immediately thereafter adding a chemical emulsion breaker which is negatively charged or nonionic, while controlling the proportions of said flocculant and said emulsion breaker to cause the entrapped oil phase to detach from the floc surface of the adsorptive solids and go into the water phase, and mechanically separating the oil from the solids and water.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1 in which said flocculant is a copolymer of methacrylamide propyl dimethyl ammonium chloride and acrylamide.
Claim 4
Dependent Claim
19 words
A process as claimed in claim 1 in which said flocculant is a quaternary sulfate of dimethyl amino methacrylate.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 1 in which said emulsion breaker is an ethoxylated fatty alcohol sulfate.
Claim 6
Dependent Claim
15 words
A process as claimed in claim 1 in which said emulsion breaker is ethoxylated nonylphenol.
Claim 7
Dependent Claim
19 words
A process as claimed in claim 1 which is carried out at a temperature of at least 120° F.
Claim 8
Dependent Claim
21 words
A process as claimed in claim 1 in which the concentration of oil in the oily sludge is at least 20%.
Claim 9
Dependent Claim
32 words
A process as claimed in claim 1 in which the flocculant is a copolymer of methacrylamide propyl dimethyl ammonium chloride and acrylamide, and the emulsion breaker is an ethoxylated fatty alcohol sulfate.
Claim 10
Dependent Claim
29 words
A process as claimed in claim 1 in which the flocculant is a copolymer of methacrylamide propyl dimethyl ammonium chloride and acrylamide, and the emulsion breaker is ethoxylated nonylphenol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |