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US4507244A
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Method for crystallizing a substance from a solution
Assignee: Walter Rau Lebensmittelwerke GmbH
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Filing: 1982-06-02
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Granted: 1985-03-26
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Expires: 2002-06-02
Abstract
Abstract In the crystallization of a substance from a solution, in particular the crystallization of fats from a mother liquor containing solvents, the solution is rapidly cooled (I) to a temperature below the crystallization temperature. This supercooled and hence supersaturated solution begins to crystallize only after ca. 60 to 90 seconds, so that during this interval (II) it may be transferred to a retention tank in which crystallization takes place (III). This method may be carried out either quasi-continuously or continuously.
Inventors
- 👤 Gerhard von Rappard
- 👤 Jurgen Grundmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:16
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0018; B01D9/0022
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A method for crystallizing a substance from a solution by cooling, including the steps of: (a) rapidly cooling the solution at a rate of at least 500° C. per hour by evaporation cooling at reduced pressure to a temperature below the crystallization temperature, the solution being a mother liquor containing solvents and the substance including fats, (b) transferring the supercooled, and hence supersaturated but not yet crystallizing, solution to a retention tank within approximately the first 60 to 90 l seconds from the time the solution reaches the below crystallization temperature, and (c) subsequently adiabatically crystallizing the solution in the retention tank.
Claim 2
Independent Claim
102 words
A method for crystallizing a substance from a solution by cooling, including the steps of: (a) rapidly cooling the solution at a rate of at least 500° C. per hour by evaporation cooling at reduced pressure to a temperature below the crystallization temperature, the solution being a mother liquor containing solvents and the substance including fats, (b) transferring the supercooled, and hence supersaturated but not yet crystallizing, solution to a retention tank within approximately the first 60 to 90 l seconds from the time the solution reaches the below crystallization temperature, and (c) subsequently adiabatically crystallizing the solution in the retention tank.
Claim 3
Dependent Claim
20 words
A method according to claim 1, wherein cooling is carried out at a rate of ca. 750° C. per hour.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein the solution is cooled to a temperature approximately 2° to 10° C. below the crystallization temperature.
Claim 5
Dependent Claim
21 words
A method according to claim 1, wherein the solution is cooled to a temperature approximately 5° C. below the crystallization temperature.
Claim 6
Dependent Claim
23 words
A method according to claim 2, wherein said solution is cooled to a temperature approximately 2° to 10° C. below the crystallization temperature.
Claim 7
Dependent Claim
21 words
A method according to claim 2, wherein the solution is cooled to a temperature approximately 5° C. below the crystallization temperature.
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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |