Patent CA721823A successfully refreshed from Google Patents.
Patent US2943703A successfully refreshed from Google Patents.
US2943703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetylene recovery
Assignee: Shell USA Inc
•
Filing: 1957-12-03
•
Granted: 1960-07-05
•
Expires: 1977-12-03
Abstract
No abstract record available.
Inventors
- 👤 David S Thayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:30
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A PROCESS FOR THE SEPARATION OF ACETYLENE FROM A GAS MIXTURE CONTAINING ACETYLENE AND TRACE AMOUNTS OF HIGHER ACETYLENES, THE IMPROVEMENT WHICH COMPRISES COMTACTING THE GAS MIXTURE IN AN ABSORPTION ZONE WITH A SUBSTANTIALLY WATER FREE, HIGH BOILING LIQUID ABSORBENT AND DISSOLVING THEREIN THE ACETYLENE AND HIGHER ACETYLENES WITH THE UNDISSOLVED PORTION OF THE MIXTURE LEAVING THE ZONE AS AN OFF GAS, SAID ABSORBENT HAVING A HIGH SOLUBILITY FOR THE VARIOUS ACETYLENE COMPOUNDS WITH ITS SOLUBILITY BEING APPRECIABLY DECREASED WITH AN INCREASE IN THE AMOUNT OF WATER PRESENT AND SAID ABSORBENT HAVING A BOILING TEMPERATURE MUCH IN EXCESS OF THE BOILING TEMPERATUES OF THE ACETYLENE AND OF WATER, RELEASING THE ACETYLENE FROM THE ABSORBENT BY HEATING WHILE RETAINING SUBSTANTIALLY ALL OF THE HIGHER ACETYLENES IN SOLUTION THEREWITH, DILUTING AT LEAST A PORTION OF THE HIGHER ACETYLENES RICH ABSORBENT WITH WATER TO FORM A PRECIPITATE CONTAINING THE HIGHER ACETYLENES, SEPARATING THE PRECIPITATE
Claim 2
Dependent Claim
152 words
IN A PROCESS FOR THE SEPARATION OF ACETYLENE FROM A GAS MIXTURE CONTAINING ACETYLENE AND TRACE AMOUNTS OF HIGHER ACETYLENES, THE IMPROVEMENT WHICH COMPRISES COMTACTING THE GAS MIXTURE IN AN ABSORPTION ZONE WITH A SUBSTANTIALLY WATER FREE, HIGH BOILING LIQUID ABSORBENT AND DISSOLVING THEREIN THE ACETYLENE AND HIGHER ACETYLENES WITH THE UNDISSOLVED PORTION OF THE MIXTURE LEAVING THE ZONE AS AN OFF GAS, SAID ABSORBENT HAVING A HIGH SOLUBILITY FOR THE VARIOUS ACETYLENE COMPOUNDS WITH ITS SOLUBILITY BEING APPRECIABLY DECREASED WITH AN INCREASE IN THE AMOUNT OF WATER PRESENT AND SAID ABSORBENT HAVING A BOILING TEMPERATURE MUCH IN EXCESS OF THE BOILING TEMPERATUES OF THE ACETYLENE AND OF WATER, RELEASING THE ACETYLENE FROM THE ABSORBENT BY HEATING WHILE RETAINING SUBSTANTIALLY ALL OF THE HIGHER ACETYLENES IN SOLUTION THEREWITH, DILUTING AT LEAST A PORTION OF THE HIGHER ACETYLENES RICH ABSORBENT WITH WATER TO FORM A PRECIPITATE CONTAINING THE HIGHER ACETYLENES, SEPARATING THE PRECIPITATE
References Cited (Backward Citations)
US1989273A
Cited
US2727587A
Cited
GB712544A
Cited
US2738860A
Cited
US2741332A
Cited
GB750323A
Cited
US2791290A
Cited
US2726734A
Cited
US2900044A
Cited
US2838133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |