Patent US4468930A successfully refreshed from Google Patents.
US4468930A
Expired / Lapsed
US
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Freeze crystallization subassembly
Assignee: CONCENTRES Inc
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Filing: 1982-04-26
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Granted: 1984-09-04
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Expires: 2002-04-26
Abstract
Abstract The invention is directed to a freeze crystallization subassembly having means for continuously removing crystals formed on a heat transfer surface from the surface. A scraper shuttle is moved across the heat transfer surface by a fluid being refrigerated to remove crystals from the surface. The crystals are carried to a mixer where they are mixed with incoming feed until a circulating slurry is produced. Means is provided to remove slurry from the mixer.
Inventors
- 👤 Wallace E. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:07
CPC Classifications
F; F28; F28G; F28G1/00; F28G1/12; F28G1/125; F25; F25C; F25C1/00; F25C1/12; F25C1/14; F28F; F28F19/00; F28F19/008
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A process for producing a slurry containing concentrated mother liquor and ice crystals from a water solution feedstream comprising the steps of: (a) supplying said feedstream to a slurry reservoir; (b) circulating slurry from said reservoir through a crystallizer where ice is deposited on heat exchange surfaces of the crystallizer; (c) providing scrapers immersed in said slurry for removing the ice from said heat exchange surfaces; (d) utilizing the pressure of circulating slurry to reciprocate said scrapers across the surfaces of said walls; and (e) removing slurry from said reservoir.
Claim 2
Dependent Claim
90 words
A process for producing a slurry containing concentrated mother liquor and ice crystals from a water solution feedstream comprising the steps of: (a) supplying said feedstream to a slurry reservoir; (b) circulating slurry from said reservoir through a crystallizer where ice is deposited on heat exchange surfaces of the crystallizer; (c) providing scrapers immersed in said slurry for removing the ice from said heat exchange surfaces; (d) utilizing the pressure of circulating slurry to reciprocate said scrapers across the surfaces of said walls; and (e) removing slurry from said reservoir.
Claim 3
Dependent Claim
18 words
A process as defined in claim 1 where 10% of the slurry is continuously removed from the reservoir.
Claim 4
Dependent Claim
20 words
A process as defined in claim 1 where up to 25% of the slurry is continuously removed from the reservoir.
Claim 5
Dependent Claim
24 words
A process as defined in claim 1 wherein the pressure for moving said shuttles is varied inversely as the volume flowing in the crystallizer.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |