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US5138075A
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Extractive separation method
Assignee: Kuraray Co Ltd
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Filing: 1990-08-27
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Granted: 1992-08-11
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Expires: 2010-08-27
Abstract
Abstract The present invention provides an extractive separation method in which a solute contained in a medium can be efficiently extracted and separated with a lower consumption of energy under the remarkably gentle operating conditions. This method consists in that a medium containing a solute consisting of organic substances is brought into contact with a solvent consisting of organic substances or inorganic substances, which have the critical temperature of 5° to 152° C. and are gaseous at an atmospheric temperature and an atmospheric pressure, to extract the solute from the medium and then the solute is separated from a mixture of extracts, said solute and said solvent being selected from a group consisting of the combinations forming a mixture system having an additional gas-liquid coexistence region, the extraction being carried out by bringing said medium into contact with said solvent in the sub-critical phase of said solvent, and the subsequent separation being carried out by heating said mixture of extracts to temperatures higher than the critical temperature of said solvent and higher the contact temperature by 5° to 30° C. This method is suitably applicable in particular to the separation of tocopherol from tocopherol-containing vegetable fats and oils with carbon dioxide as the solvent.
Inventors
- 👤 Kazunari Ohgaki
- 👤 Takashi Katayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0403; B01D11/0407; C; C11; C11B; C11B1/00; C11B1/10; C11B1/104; C11B3/00; C11B3/006; C11B3/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
An extractive separation method comprising: (a) contacting a medium that includes a solute with a solvent so as to extract a mixture of extracts, said medium including the solute comprising vegetable fats and oils containing tocopherol, wherein (1) said solute and said solvent are selected from combinations that form a mixture system whose phase equilibrium diagram has an additional gas-liquid coexistence region; (2) said solvent has a critical temperature in the range of from 5° to 152° C. and is gaseous at atmospheric pressure and atmospheric temperature; (3) said mixture of extracts comprises at least said solute; and (4) said medium contacts said solvent in the sub-critical phase of said solvent; and (b) separating said solute from said mixture of extracts by heating said mixture to a temperature higher than the critical temperature of said solvent and higher than the contact temperature by 5° to 30° C.
Claim 2
Dependent Claim
147 words
An extractive separation method comprising: (a) contacting a medium that includes a solute with a solvent so as to extract a mixture of extracts, said medium including the solute comprising vegetable fats and oils containing tocopherol, wherein (1) said solute and said solvent are selected from combinations that form a mixture system whose phase equilibrium diagram has an additional gas-liquid coexistence region; (2) said solvent has a critical temperature in the range of from 5° to 152° C. and is gaseous at atmospheric pressure and atmospheric temperature; (3) said mixture of extracts comprises at least said solute; and (4) said medium contacts said solvent in the sub-critical phase of said solvent; and (b) separating said solute from said mixture of extracts by heating said mixture to a temperature higher than the critical temperature of said solvent and higher than the contact temperature by 5° to 30° C.
Claim 3
Dependent Claim
16 words
An extractive separation method as set forth in claim 1, wherein said solvent is carbon dioxide.
Claim 4
Dependent Claim
25 words
An extractive separation method as set forth in claim 1, wherein said solvent is recovered and recirculated to use for the extraction of the solute.
Claim 5
Dependent Claim
30 words
An extractive separation method as set forth in claim 2, wherein said sub-critical phase exists at temperatures lower than the critical temperature of carbon dioxide by 5° to 10° C.
Claim 6
Dependent Claim
98 words
An extractive separation method as set forth in claim 2, wherein deodorized vegetable fats and oils are recovered in the form of extraction residue, a mixture of extracts being separated into an extract containing tocopherol as the main ingredient and the solvent containing free acids by heating to temperatures higher than the critical temperature of carbon dioxide, and then said solvent fraction is held at pressures lower than the pressure in the above described separation by 0.5 to 5 MPa to further separate said free acids from said solvent fraction, and said solvent is recycled for the extraction.
Claim 7
Dependent Claim
18 words
An extractive separation method as set forth in claim 1, wherein said solvent is ethane, propane, or propylene.
Claim 8
Dependent Claim
39 words
An extractive separation method as set forth in claim 1, wherein said mixture of extracts is heated to a temperature higher than the critical temperature of said solvent and higher than said contact temperature by 7° to 20° C.
Claim 9
Dependent Claim
34 words
An extractive separation process as set forth in claim 1, wherein said contact temperature of said solvent and said medium is lower than the critical temperature of said solvent by 5° to 20° C.
Claim 10
Dependent Claim
102 words
An extractive separation method, wherein a medium comprising vegetable fats and oils and a solute comprising tocopherol is brought into contact with a solvent comprising carbon dioxide to extract said solute from said medium, and thereafter said solute is separated from the resulting mixture of extracts, wherein said solute and said solvent form a mixture system having an additional gas-liquid coexistence region in a binary solute-solvent phase equilibrium diagram, the extraction being carried out by heating said mixture of extracts to a temperature higher than the critical temperature of said solvent and higher than the contact temperature by 5° to 30° C.
Claim 11
Dependent Claim
102 words
An extractive separation method, wherein a medium comprising vegetable fats and oils and a solute comprising tocopherol is brought into contact with a solvent comprising carbon dioxide to extract said solute from said medium, and thereafter said solute is separated from the resulting mixture of extracts, wherein said solute and said solvent form a mixture system having an additional gas-liquid coexistence region in a binary solute-solvent phase equilibrium diagram, the extraction being carried out by heating said mixture of extracts to a temperature higher than the critical temperature of said solvent and higher than the contact temperature by 5° to 30° C.
References Cited (Backward Citations)
GB634128A
Cited
US3344151A
Cited
US4260639A
Cited
US3879569A
Cited
GB1446638A
Cited
US4124528A
Cited
US4147624A
Cited
EP0010636A1
Cited
GB2059787A
Cited
GB2090836A
Cited
GB2091292A
Cited
GB2110678A
Cited
GB2117381A
Cited
US4559179A
Cited
US4578445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |