Patent US3796060A successfully refreshed from Google Patents.
US3796060A
Expired / Lapsed
US
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Process for purification by crystallization
Assignee: Union Carbide Corp
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Filing: 1971-02-22
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Granted: 1974-03-12
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Expires: 1991-02-22
Abstract
Abstract A process and apparatus are disclosed for the purification of multi-component liquid feed material having a crystallizable component employing a centrally-fed purification column substantially free of internal obstructions, a freezing chamber in communication with one end of the purification column, a melting chamber in communication with the other end of the purification column, and displacement means in the freezing chamber for passing frozen crystallizable component from the freezing chamber to the purification chamber and melting chamber.
Inventors
- 👤 C Moyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:54
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
Process in accordance with claim 1, wherein said controlled reflux rate of crystallizable component through said purification zone is maintained so as to provide total reflux.
Claim 2
Dependent Claim
156 words
Process for continuous purification of multi-component feed material having a crystallizable component comprising: providing spaced freezing and melting zones, each of said zones being jacketed, a purification zone intermediate of said freezing and melting zones, and porous piston means positioned and operative to displace crystalline phase material from said freezing zone to said purification zone; continuously introducing liquid feed material into said purification zone; maintaining temperature balance on both said freezing and melting zones to produce a controlled reflux rate of crystallizable component through said purification zone; continuously separating said crystalline phase material from the other liquid phase components of said multi-component liquid feed in said purification zone; and continuously withdrawing highly purified crystallizable component from said melting zone and the other components of said multi-component liquid from said freezing zone at rates coordinated with the rate of continuous introduction of said liquid feed material and the temperature balance maintained in said freezing and melting zones.
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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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |