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Patent US2638439A successfully refreshed from Google Patents.
US2638439A
Expired / Lapsed
US
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Treatment of petroleum distillates
Assignee: Standard Oil Development Co
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Filing: 1951-04-18
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Granted: 1953-05-12
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Expires: 1971-04-18
Abstract
No abstract record available.
Inventors
- 👤 John G Browder
- 👤 Alvin R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:21
CPC Classifications
C; C10; C10G; C10G27/00; C10G27/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A METHOD FOR SWEETENING A SOUR PETROLEUM DISTILLATE CONTAINING MERCAPTANS AND HAVING A FINAL BOILING POINT NO GREATER THAN 750* F. WHICH COMPRISES ADDING TO SAID DISTILLATE A SMALL BUT EFFECTIVE CATALYTIC AMOUNT NO GREATER THAN 1% BY VOLUME OF SAID DISTILLATE OF AN ORGANIC FRACTION OBTAINED BY: ACIDIFYING A SOLUTION OF AN ALKALI METAL SALT OF CRUDE PETROLEUM PHENOLS TO AT LEAST 75% OF A METHYL ORANGE END POINT TO RELEASE AN ACIDIC FRACTION THEREFROM, DISCARDING SAID ACIDIC FRACTION AND RETAINING SAID SOLUTION FROM WHICH ACIDIC MATERIAL HAS BEEN RELEASED, ACIDIFYING THE RETAINED SOLUTION TO THE METHYL ORANGE END POINT TO RELEASE SAID ORGANIC FRACTION, AND THEN CONTACTING THE SOUR DISTILLATE CONTAINING THE ORGANIC FRACTION WITH A CATALYTIC AMOUNT NO MORE THANN 5% BY VOLUME OF A SOLUTION OF AN ALKALI METAL HYDROXIDE WHILE ADDING A SUFFICIENT AMOUNT OF A MILD OXIDIZING AGENT TO CONVERT THE MERCAPTANS TO DISULFIDES AND TO OBTAIN A SWEETENED DISTILLATE.
Claim 2
Independent Claim
156 words
A METHOD FOR SWEETENING A SOUR PETROLEUM DISTILLATE CONTAINING MERCAPTANS AND HAVING A FINAL BOILING POINT NO GREATER THAN 750* F. WHICH COMPRISES ADDING TO SAID DISTILLATE A SMALL BUT EFFECTIVE CATALYTIC AMOUNT NO GREATER THAN 1% BY VOLUME OF SAID DISTILLATE OF AN ORGANIC FRACTION OBTAINED BY: ACIDIFYING A SOLUTION OF AN ALKALI METAL SALT OF CRUDE PETROLEUM PHENOLS TO AT LEAST 75% OF A METHYL ORANGE END POINT TO RELEASE AN ACIDIC FRACTION THEREFROM, DISCARDING SAID ACIDIC FRACTION AND RETAINING SAID SOLUTION FROM WHICH ACIDIC MATERIAL HAS BEEN RELEASED, ACIDIFYING THE RETAINED SOLUTION TO THE METHYL ORANGE END POINT TO RELEASE SAID ORGANIC FRACTION, AND THEN CONTACTING THE SOUR DISTILLATE CONTAINING THE ORGANIC FRACTION WITH A CATALYTIC AMOUNT NO MORE THANN 5% BY VOLUME OF A SOLUTION OF AN ALKALI METAL HYDROXIDE WHILE ADDING A SUFFICIENT AMOUNT OF A MILD OXIDIZING AGENT TO CONVERT THE MERCAPTANS TO DISULFIDES AND TO OBTAIN A SWEETENED DISTILLATE.
References Cited (Backward Citations)
US2569370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |