Patent US3000794A successfully refreshed from Google Patents.
US3000794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation of vinyl acetylene in the purification of butadiene
Assignee: Petro Tex Chemical Corp
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Filing: 1958-05-19
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Granted: 1961-09-19
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Expires: 1978-05-19
Abstract
No abstract record available.
Inventors
- 👤 Lloyd D Tschopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:15
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD FOR PREPARING HIGH PURITY BUTADIENE CONTAINING A SMALL AMOUNT OF VINYL ACETYLENE WHICH COMPRISES FRACTIONALLY DISTILLING IN A FRACTIONAL DISTILLATION ZONE A MIXTURE OF HYDROCARBONS CONTAINING A SUBSTANTIAL PORTION OF BUTADIENE AND VINYL ACETYLENE AS AN IMPURITY, WITHDRAWING A SIDE STREAM FROM SAID FRACTIONAL DISTILLATION ZONE OF SAID HYDROCARBON MIXTURE CONTAINING A HIGHER CONCENTRATION OF VINYL ACETYLENE THAN THE VINYL ACETYLENE CONTENT OF THE TOTAL HYDROCARBON MIXTURE BEING FRACTIONALLY DISTILLED, EXTRACTIVELY DISTILLING SAID SIDE STREAM WITH A POLAR SOLVENT FOR THE VINYL ACETYLENE UNDER CONDITIONS SUCH THAT AT LEAST A PORTION OF SAID VINYL ACETYLENE IS EXTRACTED FROM THE HYDROCARBON MIXTURE, AND RETURNING THE OVERHEAD, WHICH IS THE EXTRACTIVELY DISTILLED HYDROCARBON MIXTURE, CONTAINING REDUCED VINYL ACETYLENE TO SAID FRACTIONAL DISTILLATION ZONE AND REMOVING THE BUTADIENE 1.3 OVERHEAD FROM SAID FRACTIONAL DISTILLATION ZONE.
Claim 2
Independent Claim
134 words
A METHOD FOR PREPARING HIGH PURITY BUTADIENE CONTAINING A SMALL AMOUNT OF VINYL ACETYLENE WHICH COMPRISES FRACTIONALLY DISTILLING IN A FRACTIONAL DISTILLATION ZONE A MIXTURE OF HYDROCARBONS CONTAINING A SUBSTANTIAL PORTION OF BUTADIENE AND VINYL ACETYLENE AS AN IMPURITY, WITHDRAWING A SIDE STREAM FROM SAID FRACTIONAL DISTILLATION ZONE OF SAID HYDROCARBON MIXTURE CONTAINING A HIGHER CONCENTRATION OF VINYL ACETYLENE THAN THE VINYL ACETYLENE CONTENT OF THE TOTAL HYDROCARBON MIXTURE BEING FRACTIONALLY DISTILLED, EXTRACTIVELY DISTILLING SAID SIDE STREAM WITH A POLAR SOLVENT FOR THE VINYL ACETYLENE UNDER CONDITIONS SUCH THAT AT LEAST A PORTION OF SAID VINYL ACETYLENE IS EXTRACTED FROM THE HYDROCARBON MIXTURE, AND RETURNING THE OVERHEAD, WHICH IS THE EXTRACTIVELY DISTILLED HYDROCARBON MIXTURE, CONTAINING REDUCED VINYL ACETYLENE TO SAID FRACTIONAL DISTILLATION ZONE AND REMOVING THE BUTADIENE 1.3 OVERHEAD FROM SAID FRACTIONAL DISTILLATION ZONE.
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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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |