Patent US3666632A successfully refreshed from Google Patents.
US3666632A
Expired / Lapsed
US
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Method for the separation of acrylic acid from aqueous solution containing acrylic acid and acetic acid
Assignee: Asahi Kasei Corp
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Filing: 1969-10-02
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Granted: 1972-05-30
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Expires: 1989-10-02
Abstract
Abstract IN THE PROCESS FOR SEPARATING ACRYLIC ACID FROM AQUEOUS SOLUTION CONTAINING ACRYLIC ACID AND ACETIC ACID, THE IMPROVEMENT WHHICH COMPRISES SUBJECTING THE SAID AQUEOUS SOLUTION TO AN AZEOTROPIC DISTILLATION IN THE PRESENCE OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF BUTYL ACETATE, ETHYL BUTYRATE, ETHYL ISOBUTYRATE, ETHYL METHACRYLATE, PROPYL ACRYLATE AND PROPYL PROPIONATE AS AN ENTRAINER, DISTILLING OFF ACETIC ACID AND WATER FROM THE COLUMN HEAD AND SEPARATING ACRYLIC ACID FROM THE COLUMN BOTTOM.
Inventors
- 👤 Makoto Honda
- 👤 Yasuhiro Kubota
- 👤 Atsushi Aoshima
- 👤 Tokuichi Hisamatsu
- 👤 Minoru Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:25
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/46; Y; Y10; Y10S; Y10S203/00; Y10S203/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |