US4560513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of lecithin
Assignee: Cargill Texturizing Solutions Deutschland GmbH and Co KG
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Filing: 1983-07-22
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Granted: 1985-12-24
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Expires: 2003-07-22
Abstract
Abstract A process for the recovery of lecithin from mucilaginous substances obtained in the production of vegetable fats and oils by extraction with a solvent which is gaseous under normal conditions. The mucilaginous substances are extracted at a pressure from 2×p k to 500 bar and at a temperature from 0° C. to <T k for a period from 15 to 60 minutes to form a charged compressed solvent phase containing extracted substances and an extraction residue containing insoluble lecithin. Then, the charged, compressed solvent phase is separated from the insoluble lecithin. Thereafter the extracted substances are separated from the charged, compressed solvent phase and the gaseous solvent is returned to the extraction stage. The lecithin is removed from the extraction stage and is obtained in solid form by evaporating the solvent.
Inventors
- 👤 Hubert Coenen
- 👤 Rudolf Eggers
- 👤 Rainer Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:23
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0403; B01D11/0407; A; A23; A23J; A23J7/00; A23V; A23V2002/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
163 words
Process for the recovery of lecithin from mucilaginous substances obtained in the production of vegetable fats and oils by extraction of the mucilaginous substances with a solvent which is gaseous under normal conditions, comprising: extracting the mucilaginous substances in an extraction stage with a solvent at a pressure of from twice the critical pressure to 500 bar and at a temperature greater than or equal to 0° C. but less than the critical temperature for a period of from 15 to 60 minutes to form a charged, compressed solvent phase containing extracted substances and an extraction residue containing insoluble lecithin; thereafter separating the charged, compressed solvent phase from the insoluble lecithin; then separating the extracted substances from the charged, compressed solvent phase by the reduction of pressure or the reduction of pressure and increase of temperature; returning the gaseous solvent to the extraction stage; and removing the lecithin from the extraction stage and obtaining it in solid form by evaporating any solvent therefrom.
Claim 2
Dependent Claim
163 words
Process for the recovery of lecithin from mucilaginous substances obtained in the production of vegetable fats and oils by extraction of the mucilaginous substances with a solvent which is gaseous under normal conditions, comprising: extracting the mucilaginous substances in an extraction stage with a solvent at a pressure of from twice the critical pressure to 500 bar and at a temperature greater than or equal to 0° C. but less than the critical temperature for a period of from 15 to 60 minutes to form a charged, compressed solvent phase containing extracted substances and an extraction residue containing insoluble lecithin; thereafter separating the charged, compressed solvent phase from the insoluble lecithin; then separating the extracted substances from the charged, compressed solvent phase by the reduction of pressure or the reduction of pressure and increase of temperature; returning the gaseous solvent to the extraction stage; and removing the lecithin from the extraction stage and obtaining it in solid form by evaporating any solvent therefrom.
Claim 3
Dependent Claim
50 words
Process as defined in claim 1, wherein the solvent is at least one compound selected from the group consisting of carbon dioxide, ethane, ethene and a mixture of one or a plurality of these compounds with at least one compound selected from the group consisting of methane, propane, and propene.
Claim 4
Dependent Claim
12 words
Process as defined in claim 1, wherein the solvent contains an entrainer.
Claim 5
Dependent Claim
11 words
Process as defined in claim 3, wherein the entrainer is ethanol.
Claim 6
Dependent Claim
67 words
Process as defined in claim 1, wherein the mucilaginous substances are extracted with ethane at a pressure of from 250 to 350 bar and at a temperature of from 1° to 15° C. and the separation of the extracted substances from the charged, compressed solvent phase takes place at a pressure of from 30 to 40 bar and at a temperature of from 20° to 40° C.
Claim 7
Dependent Claim
68 words
Process as defined in claim 1, wherein the mucilaginous substances are extracted with carbon dioxide at a pressure of from 300 to 500 bar and at a temperature of from 5° to 29° C. and the separation of the extracted substances from the charged, compressed solvent phase takes place at a pressure of from 10 to 30 bar and at a temperature of from 5° to 30° C.
Claim 8
Dependent Claim
12 words
Process as defined in claim 2, wherein the solvent contains an entrainer.
Claim 9
Dependent Claim
11 words
Process as defined in claim 7, wherein the entrainer is ethanol.
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) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |