US3716474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure thermal treatment of waste oil-containing sludges
Assignee: Texaco Inc
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Filing: 1970-10-22
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Granted: 1973-02-13
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Expires: 1990-10-22
Abstract
Abstract Oil-water emulsion-type sludges, in particular refinery pit sludges are thermally treated at a temperature of at least 750* F under pressure of at least 3,000 psi to give a gas phase containing saturated hydrocarbons, suitable as fuel or cracking stock, a usable oil fraction, a water phase and a useful siltcoke phase.
Inventors
- 👤 H Hess
- 👤 E Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:22
CPC Classifications
C; C10; C10G; C10G33/00; C02; C02F; C02F11/00; C02F11/12; C02F11/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
In a sludge treatment process, the steps of: heat treating an oil-containing emulsified sludge in a coking zone at a temperature of between about 750* F and 850* F under a pressure of 3000 to 6,500 psi to form a gas phase, an oil fraction, an aqueous phase and a silt-coke phase; allowing said products to cool; separating said silt-coke phase from said other products; separating said aqueous phase from said gas phase and said oil phase and recovering said oil and said gas from their respective phases.
Claim 2
Dependent Claim
88 words
In a sludge treatment process, the steps of: heat treating an oil-containing emulsified sludge in a coking zone at a temperature of between about 750* F and 850* F under a pressure of 3000 to 6,500 psi to form a gas phase, an oil fraction, an aqueous phase and a silt-coke phase; allowing said products to cool; separating said silt-coke phase from said other products; separating said aqueous phase from said gas phase and said oil phase and recovering said oil and said gas from their respective phases.
Claim 3
Dependent Claim
31 words
The process as defined in claim 1, wherein said silt-coke phase is removed from said coking zone by being blown down as a water slurry and said slurry is flash evaporated.
Claim 4
Dependent Claim
21 words
The process as defined in claim 1, wherein said sludge is preheated by heat exchange with products from said heat treating.
Claim 5
Dependent Claim
26 words
The process as defined in claim 1, wherein said gas phase, said oil phase and said aqueous phase are depressured prior to separation from one another.
Claim 6
Dependent Claim
40 words
The process as defined in claim 1, wherein said coking zone includes an insulated portion in which said sludge is retained and a non-insulated portion depending from said insulated portion and adapted to receive said silt-coke phase as it forms.
Claim 7
Dependent Claim
21 words
The process as defined in claim 1, wherein said heat treating is continued for about 10 minutes to about 120 minutes.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |