US4448669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon recovery from diatomite
Assignee: Phillips Petroleum Co
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Filing: 1983-03-16
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Granted: 1984-05-15
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Expires: 2003-03-16
Abstract
Abstract Supercritical extraction of diatomaceous earth results in a much more significant improvement in hydrocarbon recovery over Fischer retorting than achievable with tar sands. Process and apparatus for supercritical extraction of diatomaceous earth are disclosed.
Inventors
- 👤 James Scinta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:50
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; B; B01; B01D; B01D11/00; B01D11/02; B01D11/0203; Y; Y10; Y10S; Y10S208/00; Y10S208/952
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
57 words
Process for recovering hydrocarbon values comprising (a) subjecting a mixture of diatomaceous earth containing hydrocarbons and solvent to supercritical conditions with respect to the solvent, (b) separating a fluid phase comprising at least a portion of said solvent and some of said hydrocarbon values from a solid phase comprising at least some of the remaining diatomaceous earth.
Claim 2
Dependent Claim
57 words
Process for recovering hydrocarbon values comprising (a) subjecting a mixture of diatomaceous earth containing hydrocarbons and solvent to supercritical conditions with respect to the solvent, (b) separating a fluid phase comprising at least a portion of said solvent and some of said hydrocarbon values from a solid phase comprising at least some of the remaining diatomaceous earth.
Claim 3
Dependent Claim
29 words
Process in accordance with claim 1 further comprising (c) separating said fluid phase into a solvent stream containing predominantly said solvent and a hydrocarbon stream containing predominantly said hydrocarbons.
Claim 4
Dependent Claim
22 words
Process in accordance with claim 1 wherein said solvent is substantially a hydrocarbon material having 3 to 12 carbon atoms per molecule.
Claim 5
Dependent Claim
81 words
Process in accordance with claim 2 wherein said separation is carried out at least in part by either raising the temperature of at least a portion of the fluid phase or reducing the pressure of at least a portion of the fluid phase or both to thereby cause the establishment of at least two fluid phases and the phase separation of two fluid phases into a solvent phase and a hydrocarbon phase, and separating said solvent phase from said hydrocarbon phase.
Claim 6
Dependent Claim
40 words
Process in accordance with claim 1 wherein said mixture is circulated under supercritical conditions in a loop reactor and wherein a mixture of said fluid phase and diatomaceous earth solids is periodically removed from said loop reactor for further processing.
Claim 7
Dependent Claim
15 words
Process in accordance with claim 5 wherein said mixture is introduced continuously into said loop.
Claim 8
Dependent Claim
33 words
Process in accordance with claim 5 wherein said mixture in said loop contains substantially less diatomaceous earth solids than the mixture introduced into the loop and than the mixture withdrawn from said loop.
Claim 9
Dependent Claim
20 words
Process in accordance with claim 1 wherein said mixture is passed under supercritical conditions through a series of stirred contactors.
Claim 10
Dependent Claim
40 words
Process in accordance with claim 1 wherein said mixture is separated into a solid rich phase and into an essentially liquid phase by passing the mixture through a solid/liquid separation means while under supercritical conditions with respect to the solvent.
Claim 11
Dependent Claim
24 words
A process in accordance with claim 9 wherein said solid/liquid separation means are selected from the group consisting of settlers, cyclones, centrifuges and filters.
Claim 12
Dependent Claim
41 words
Process in accordance with claim 10 wherein at least a portion of the solid rich phase from said solid/liquid separation means is passed through fluid hydrocarbon recovery means yielding a substantially hydrocarbon free diatomaceous earth stream and a recovered hydrocarbon stream.
Claim 13
Dependent Claim
44 words
A process in accordance with claim 11 wherein said fluid hydrocarbon recovery means is selected from the group consisting of a washing unit operated under supercritical conditions and a dryer operated under a pressure substantially below the operating pressure of the solid/liquid separating means.
Claim 14
Dependent Claim
33 words
Process in accordance with claim 11 wherein said recovered hydrocarbon stream is subjected to a separation step together with said liquid phase such as to recover a solvent stream and an extract stream.
Claim 15
Dependent Claim
40 words
Process in accordance with claim 13 wherein said solvent stream is recycled into contact with diatomaceous earth and wherein said extract stream is stripped to recover remaining solvent, which recovered remaining solvent is also recycled into contact with diatomaceous earth.
References Cited (Backward Citations)
GB1261707A
Cited
US4108760A
Cited
US4192731A
Cited
US4397736A
Cited
US4390411A
Cited
US4374023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |