US3764627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of alcohols and ketones using methylene chloride and water
Assignee: Celanese Corp
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Filing: 1971-03-19
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Granted: 1973-10-09
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Expires: 1991-03-19
Abstract
Abstract A dual solvent extraction process for separating mixtures of aliphatic ketones and water soluble alcohols, such as mixtures of acetone and methanol, one phase of the dual solvent being water and the other being methylene chloride. The alcohols are preferentially dissolved into the water phase and the ketones into the methylene chloride phase.
Inventors
- 👤 R Prinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:31
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/86; C07C45/00; C07C45/78; C07C45/80
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
The process of claim 1 wherein said water soluble alcohol is methanol and wherein said ketone is acetone.
Claim 2
Dependent Claim
24 words
The process of claim 1 wherein said mixture contains by volume from about 50% to 92% water-soluble alcohol and 8% to 50% dialkyl ketone.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said water phase is treated so as to recover the water-soluble alcohols therefrom.
Claim 4
Dependent Claim
40 words
The process of claim 1 wherein there is provided to said extraction zone an amount of water such that there is from about 1.1 to 2.0 volumes of water present for each volume of the mixture of alcohols and ketones.
Claim 5
Dependent Claim
52 words
The process of claim 5 wherein said alcohol is methanol, wherein said ketone is acetone and wherein the intimate contact of said mixture with both phases of said dual solvent system is accomplished at temperatures within the range of about 15* C. to 40* C. and the pressure sufficient to prevent boiling.
Claim 6
Dependent Claim
16 words
The process of claim 6 wherein the methanol is recovered from said water phase by distillations.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |