Patent US3073874A successfully refreshed from Google Patents.
US3073874A
Expired / Lapsed
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Method of separation of isobutylene from mixtures of hydrocarbons
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1959-03-25
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Granted: 1963-01-15
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Expires: 1979-03-25
Abstract
No abstract record available.
Inventors
- 👤 Valet Andre
- 👤 Jean J Bellec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:13
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C7/148; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A METHOD FOR THE SEPARATION AND REMOVAL OF ISOBUTYLENE POLYMERS FORMED IN AN ISOBUTYLENE EXTRACTION SYSTEM IN WHICH ISOBUTYLENE IS EXTRACTED FROM A MIXTURE OF HYDROCARBONS BY SULFURIC ACID TO PRODUCE AN EXTRACTION MIXTURE INCLUDING ISOBUTYLENE AND TERTIARY BUTANOL AND SAID SULFURIC ACID ALONG WITH SAID POLYMERS, THE STEPS WHICH COMPRISE SEPARATING SAID EXTRACTION MIXTURE BY DISTILLATION INTO SULFURIC ACID AND A DISTILLATE PHASE INCLUDING ALL OTHER SAID COMPONENTS OF SAID MIXTURE, THEREAFTER RECOVERING SUBSTANTIALLY PURE ISOBUTYLENE FROM SAID DISTILLATE PHASE BY CONDENSATION AND RECTIFICATION LEAVING A RESIDUAL
Claim 2
Dependent Claim
89 words
IN A METHOD FOR THE SEPARATION AND REMOVAL OF ISOBUTYLENE POLYMERS FORMED IN AN ISOBUTYLENE EXTRACTION SYSTEM IN WHICH ISOBUTYLENE IS EXTRACTED FROM A MIXTURE OF HYDROCARBONS BY SULFURIC ACID TO PRODUCE AN EXTRACTION MIXTURE INCLUDING ISOBUTYLENE AND TERTIARY BUTANOL AND SAID SULFURIC ACID ALONG WITH SAID POLYMERS, THE STEPS WHICH COMPRISE SEPARATING SAID EXTRACTION MIXTURE BY DISTILLATION INTO SULFURIC ACID AND A DISTILLATE PHASE INCLUDING ALL OTHER SAID COMPONENTS OF SAID MIXTURE, THEREAFTER RECOVERING SUBSTANTIALLY PURE ISOBUTYLENE FROM SAID DISTILLATE PHASE BY CONDENSATION AND RECTIFICATION LEAVING A RESIDUAL
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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |