US3738915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating vinyl acetate from liquid mixtures with plural distillations and side stream phase separation
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1971-06-18
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Granted: 1973-06-12
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Expires: 1991-06-18
Abstract
Abstract VINYL ACETATE IS SEPARATED FROM MIXTURES ALSO CONTAINING METHYL ACETATE AND WATER, BY FEEDING THE MIXTURES TO AN INTERMEDIATE POSITION OF A FRACTIONAL DISTILLATION COLUMN, DRAWING OFF AN AQUEOUS PHASE A OVE THAT POSITION AND SEPARATING IT INTO AN AQUEOUS AND A ORGANIC PHASE, RETURNING THE ORGANIC FRACTION TO THE COLUMN AT A POINT BETWEEN THE MIXTURE FEED POINT AND THE POINT AT WHICH THE AQUEOUS PHASE IS DRAWN OFF, AND REMOVING LIGHT PRODUCTS AT THE TOP OF THE COLUMN AND VINYL ACETATE, WITH HEAVY PRODUCTS, AT THE BOTTOM FOR SUBSEQUENT FRACTIONATION. D R A W I N G
Inventors
- 👤 Fiore L Di
- 👤 C Divo
- 👤 M Ghirga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:51
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/52; C07C67/54; B; B01; B01D; B01D3/00; B01D3/14; Y; Y10; Y10S; Y10S203/00; Y10S203/10
Claims Analysis
Total Claims: 0
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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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |