Patent US3684783A successfully refreshed from Google Patents.
US3684783A
Expired / Lapsed
US
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Diluent recovery process
Assignee: JOHN D LAUCK
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Filing: 1970-11-05
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Granted: 1972-08-15
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Expires: 1990-11-05
Abstract
Abstract An improved process for separating a volatile organic diluent from a low density olefin polymer in solution of suspension comprises vaporizing the diluent with steam and water at an elevated temperature and separating a slurry of polymer and water; discharging a vapor stream containing a small amount of polymer particles into a cyclone vessel; withdrawing the vapors substantially free of polymer and recovering the diluent; and removing the separated particles from the cyclone with a flow of water at a downward velocity exceeding the rise velocity of the particles through the water to prevent agglomeration of the particles.
Inventors
- 👤 John D Lauck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:51
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/06; C08F; C08F6/00; C08F6/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
23 words
A process as in claim 1 wherein said olefin polymer has a specific gravity in the range from about 0.80 to about 0.98.
Claim 2
Dependent Claim
29 words
A process as in claim 1 wherein at least a portion of the aqueous slurry from said separation zone is recycled to the lower portion of said separating zone.
Claim 3
Dependent Claim
21 words
A process as in claim 1 wherein said volatile organic diluent is a hydrocarbon of about four to 10 carbon atoms.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |