US3344178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic acid concentration by extraction and distillation with a solvententrainer
Assignee: Distillers Co Yeast Ltd
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Filing: 1964-05-11
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Granted: 1967-09-26
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Expires: 1984-05-11
Abstract
No abstract record available.
Inventors
- 👤 Brown Christopher John
- 👤 Newman Frank Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR THE CONCENTRATION OF AQUEOUS ACRYLIC ACID SOLUTIONS WHICH COMPRISES EXTRACTING THE AQUEOUS ACRYLIC ACID WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ETHYL ACRYLATE AND ETHYL ACETATE WHEREBY THE ACRYLIC ACID IS EXTRACTED INTO THE ESTER PHASE, FRACTIONALLY DISTILLING THE ESTER PHASE UNDER REDUCED PRESSURE TO SEPARATE THE ESTER AS AN OVERHEAD AZEOTROPIC FRACTION WITH SUBSTANTIALLY ALL OF THE WATER, RECOVERING DRY CONCENTRATED ACRYLIC ACID FROM THE BASE OF THE COLUMN, AND MAINTAINING SUFFICIENT ESTER IN THE COLUMN TO ENSURE THAT SUBSTANTIALLY ALL OF THE WATER IS REMOVED IN THE OVERHEAD FRACTION.
Claim 2
Dependent Claim
96 words
A PROCESS FOR THE CONCENTRATION OF AQUEOUS ACRYLIC ACID SOLUTIONS WHICH COMPRISES EXTRACTING THE AQUEOUS ACRYLIC ACID WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ETHYL ACRYLATE AND ETHYL ACETATE WHEREBY THE ACRYLIC ACID IS EXTRACTED INTO THE ESTER PHASE, FRACTIONALLY DISTILLING THE ESTER PHASE UNDER REDUCED PRESSURE TO SEPARATE THE ESTER AS AN OVERHEAD AZEOTROPIC FRACTION WITH SUBSTANTIALLY ALL OF THE WATER, RECOVERING DRY CONCENTRATED ACRYLIC ACID FROM THE BASE OF THE COLUMN, AND MAINTAINING SUFFICIENT ESTER IN THE COLUMN TO ENSURE THAT SUBSTANTIALLY ALL OF THE WATER IS REMOVED IN THE OVERHEAD FRACTION.
References Cited (Backward Citations)
US1668380A
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US1915002A
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US2159146A
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US2269163A
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US2333756A
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US3264347A
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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) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |