US4601906A
Expired / Lapsed
US
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Extraction process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1984-10-10
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Granted: 1986-07-22
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Expires: 2004-10-10
Abstract
Abstract An extraction vessel A is charged with a particulate solid, e.g. oilseed, and a transfer liquid, e.g. water, in an amount sufficient to pressurize vessel A to an elevated pressure. Extraction solvent, e.g. carbon dioxide, is introduced, preferably from a storage vessel B, to displace transfer liquid from vessel A. After extraction by the solvent, the latter may be displaced into vessel B by transfer liquid which is preferably stored under pressure in vessel B during the extraction. The extraction solvent is gaseous at ambient conditions but preferably is liquid or a supercritical fluid at the displacement conditions.
Inventors
- 👤 Brian D. Shindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:54
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0203
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
161 words
A process for the extraction of a material from a particulate solid comprising the steps of: (a) charging into an extraction vessel a particulate solid containing an extractable material and a transfer liquid for pressurizing the reaction vessel, the amount of transfer liquid being such that the vessel is pressurized to an elevated pressure, (b) displacing the transfer liquid from the extraction vessel by transferring into the extraction vessel, at said elevated pressure, an extraction solvent that is adapted to extracture material from particulate solid and is gaseous at ambient temperature and atmospheric pressure, the transfer liquid being liquid both at ambient temperature and atmospheric pressure and at the pressure and temperature at which the displacement is effected, (c) extracting the material from the particulate solid with the extraction solvent, (d) separating the extracted material from the extraction solvent, and (e) after extraction of the material from the particulate solid, discharging the residue of the particulate solid from the extraction vessel.
Claim 2
Dependent Claim
161 words
A process for the extraction of a material from a particulate solid comprising the steps of: (a) charging into an extraction vessel a particulate solid containing an extractable material and a transfer liquid for pressurizing the reaction vessel, the amount of transfer liquid being such that the vessel is pressurized to an elevated pressure, (b) displacing the transfer liquid from the extraction vessel by transferring into the extraction vessel, at said elevated pressure, an extraction solvent that is adapted to extracture material from particulate solid and is gaseous at ambient temperature and atmospheric pressure, the transfer liquid being liquid both at ambient temperature and atmospheric pressure and at the pressure and temperature at which the displacement is effected, (c) extracting the material from the particulate solid with the extraction solvent, (d) separating the extracted material from the extraction solvent, and (e) after extraction of the material from the particulate solid, discharging the residue of the particulate solid from the extraction vessel.
Claim 3
Dependent Claim
62 words
A process according to claim 1 wherein the extraction vessel is charged at atmospheric pressure with the particulate solid and a sufficient amount of the transfer liquid that the vessel is filled with the particulate solid and transfer liquid and then the pressure in the vessel is increased to the elevated pressure by pumping in a further quantity of the transfer liquid.
Claim 4
Dependent Claim
56 words
A process according to claim 1 wherein the particulate material is charged to the extraction vessel as a slurry in the transfer liquid by pumping the slurry into the extraction vessel containing extraction solvent at the elevated pressure, the extraction solvent being displaced from the extraction vessel into a storage vessel as the slurry is introduced.
Claim 5
Dependent Claim
34 words
A process according to claim 3 wherein the transfer liquid is displaced from the extraction vessel after charging the particulate solid thereto by transferring extraction solvent from the storage vessel into the extraction vessel.
Claim 6
Dependent Claim
44 words
A process according to claim 1 wherein the extraction of the material from the particulate solid with the extraction solvent is effected at an elevated pressure that is substantially equal to the pressure at which the transfer liquid is liquid by the extraction solvent.
Claim 7
Dependent Claim
40 words
A process according to claim 1 wherein the transfer liquid is displaced from the extraction vessel into a storage vessel containing extraction solvent at the elevated pressure by transferring the extraction solvent from the storage vessel into the extraction vessel.
Claim 8
Dependent Claim
50 words
A process according to claim 1 wherein, after the desired degree of extraction has taken place, extraction solvent is displaced from the extraction vessel with a transfer liquid, and then the transfer liquid and the residue of the particulate solid remaining after said extraction are discharged from the extraction vessel.
Claim 9
Dependent Claim
23 words
A process according to claim 7 wherein extraction solvent dissolved in the transfer liquid discharged from the extraction vessel is recovered for re-use.
Claim 10
Dependent Claim
43 words
A process according to claim 7 wherein the extraction solvent is displaced from the extraction vessel, after the extraction, into a storage vessel containing transfer liquid at the elevated pressure by transferring the transfer liquid from the storage vessel into the extraction vessel.
Claim 11
Dependent Claim
94 words
A process according to claim 7 wherein, after charging the extraction vessel with the particulate solid and the transfer liquid so that the extraction vessel is pressurised to the elevated pressure, the transfer liquid is displaced from the extraction vessel into a storage vessel containing extraction solvent at the elevated pressure by transferring the extraction solvent from the storage vessel into the extraction vessel and, after the extraction, the extraction solvent is displaced from the extraction vessel into the storage vessel by transferring the transfer liquid from the storage vessel into the extraction vessel.
Claim 12
Dependent Claim
36 words
A process according to claim 10 wherein at the pressure and temperature at which the transfer liquid is displaced from the extraction vessel, the transfer liquid has a density greater than that of the extraction solvent.
Claim 13
Dependent Claim
32 words
A process according to claim 1 wherein, at the pressure and temperature at which the transfer liquid is displaced from the extraction vessel, the extraction solvent is a liquid or supercritical fluid.
Claim 14
Dependent Claim
26 words
A process according to claim 1 for the extraction of oil from oilseed wherein the transfer liquid is water and the extraction solvent is carbon dioxide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |