Patent US3616271A successfully refreshed from Google Patents.
US3616271A
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Separation of chloroform and/or ethyl acetate from vinyl acetate by extractive distillation
Assignee: EIDP Inc
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Filing: 1968-10-25
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Granted: 1971-10-26
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Expires: 1988-10-25
Abstract
Abstract An extractive distillation method of separating chloroform, and/or ethyl acetate from vinyl acetate, particularly when such materials are present as impurities in vinyl acetate. The method involves using a hydrocarbon, e.g., an acyclic aliphatic, an alkyl aromatic, or a cycloaliphatic hydrocarbon having a boiling point of at least 100* C., e.g., 100*-250* C., as the extraction solvent.
Inventors
- 👤 Harry B Copelin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:36
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/04; C07C67/05; C07C67/055; C07C17/00; C07C17/38; C07C67/48; C07C67/52; C07C67/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
The process of claim 1 wherein the hydrocarbon extraction solvent boils at 100* - 250* C.
Claim 2
Dependent Claim
15 words
The process of claim 1 wherein the hydrocarbon extraction solvent boils at 125* -200* C.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the hydrocarbon extraction solvent is a paraffinic hydrocarbon cut having a boiling range of about 170* - 175* C.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the hydrocarbon extraction solvent is pentamethylheptane.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the hydrocarbon extraction solvent is kerosene.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the hydrocarbon extraction solvent is pinene.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the hydrocarbon extraction solvent is trimethyl cyclohexane.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |