Patent US2756266A successfully refreshed from Google Patents.
US2756266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon separation
Assignee: ExxonMobil Oil Corp
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Filing: 1953-03-19
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Granted: 1956-07-24
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Expires: 1973-03-19
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:09
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
THE PROCESS FOR SEPARATING A STRAIGHT CHAIN OLEFIN FROM A HYDROCARBON MIXTURE CONTAINING THE SAME AND AT LEAST ONE HYDROCARBON OTHER THAN THE OLEFIN, SAID OLEFIN HAVING FROM TWO TO ABOUT EIGHT CARBON ATOMS PER MOLECULE, WHICH COMPRISES: CONTACTING SAID MIXTURE, AT A TEMPERATURE BETWEEN ABOUT -40* C. AND ABOUT +25* C., WITH SULFURIC ACID IN ADMIXTURE WITH AN ORGANIC DILUENT THEREFOR, WHEREUPON SAID OLEFIN IS PREFERENTIALLY EXTRACTED FROM SAID HYDROCARBON MIXTURE; SAID ORGANIC DILUENT BEING ONE WHICH MIXES WITH SULFURIC ACID WITHOUT APPRECIABLE HEAT FORMATION AND WHICH IS IMMISCIBLE WITH PARAFFINS AT TEMPERATURES OF THE ORDER OF 0* C., AND SAID ADMIXTURE CONTAINING FROM ABOUT TEN PERCENT TO ABOUT FIFTY PERCENT BY WEIGHT OF SULFURIC ACID HAVING BEFORE DILUTION WITH SAID DILUENT A SPECIFIC GRAVITY OF NOT LESS THAN 1.82, THE TOTAL AMOUNT OF WATER IN SAID ADMIXTURE BEING NO MORE THAN TEN PERCENT OF THE SULFURIC ACID PRESENT.
Claim 2
Dependent Claim
150 words
THE PROCESS FOR SEPARATING A STRAIGHT CHAIN OLEFIN FROM A HYDROCARBON MIXTURE CONTAINING THE SAME AND AT LEAST ONE HYDROCARBON OTHER THAN THE OLEFIN, SAID OLEFIN HAVING FROM TWO TO ABOUT EIGHT CARBON ATOMS PER MOLECULE, WHICH COMPRISES: CONTACTING SAID MIXTURE, AT A TEMPERATURE BETWEEN ABOUT -40* C. AND ABOUT +25* C., WITH SULFURIC ACID IN ADMIXTURE WITH AN ORGANIC DILUENT THEREFOR, WHEREUPON SAID OLEFIN IS PREFERENTIALLY EXTRACTED FROM SAID HYDROCARBON MIXTURE; SAID ORGANIC DILUENT BEING ONE WHICH MIXES WITH SULFURIC ACID WITHOUT APPRECIABLE HEAT FORMATION AND WHICH IS IMMISCIBLE WITH PARAFFINS AT TEMPERATURES OF THE ORDER OF 0* C., AND SAID ADMIXTURE CONTAINING FROM ABOUT TEN PERCENT TO ABOUT FIFTY PERCENT BY WEIGHT OF SULFURIC ACID HAVING BEFORE DILUTION WITH SAID DILUENT A SPECIFIC GRAVITY OF NOT LESS THAN 1.82, THE TOTAL AMOUNT OF WATER IN SAID ADMIXTURE BEING NO MORE THAN TEN PERCENT OF THE SULFURIC ACID PRESENT.
Claim 3
Dependent Claim
60 words
A SOLUTION CHARACTERIZED BY A HIGH SELECTIVITY FOR OLEFINS AS OPPOSED TO PARAFFINS, CONSISTING ESSENTIALLY OF: FROM ABOUT TWENTY TO ABOUT THIRTY PERCENT BY WEIGHT OF SULFURIC ACID HAVING A SPECIFIC GRAVITY OF NOT LESS THAN 1.82, AND DIMETHYL SULFATE, THE TOTAL AMOUNT OF WATER IN SAID SOLUTION BEING NO MORE THAN ABOUT TEN PERCENT OF THE SULFURIC ACID PRESENT.
Claim 4
Dependent Claim
60 words
A SOLUTION CHARACTERIZED BY A HIGH SELECTIVITY FOR OLEFINS AS OPPOSED TO PARAFFINS, CONSISTING ESSENTIALLY OF: FROM ABOUT TWENTY TO ABOUT THIRTY PERCENT BY WEIGHT OF SULFURIC ACID HAVING A SPECIFIC GRAVITY OF NOT LESS THAN 1.82, AND DIMETHYL SULFATE, THE TOTAL AMOUNT OF WATER IN SAID SOLUTION BEING NO MORE THAN ABOUT TEN PERCENT OF THE SULFURIC ACID PRESENT.
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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) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |