US3376217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing thiophenes from light oil with sulfuric acid
Assignee: United States Steel Corp
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Filing: 1965-02-10
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Granted: 1968-04-02
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Expires: 1985-02-10
Abstract
No abstract record available.
Inventors
- 👤 Grange Charles J De
- 👤 Steven F Gobla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:20
CPC Classifications
C; C10; C10G; C10G17/00; C10G17/02; C10G17/04; C10G17/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A METHOD OF SUBSTANTIALLY REMOVING THIOPHENES FROM LIGHT OIL PRODUCED IN COAL DISTILLATION AND HAVING ABOUT 5000-7000 PARTS PER MILLION OF THIOPHENE, WHICH METHOD COMPRISES THE STEPS OF: (A) INTIMATELY MIXING SAID LIGHT OIL WITH BETWEEN ABOUT 3.25 AND 4.5, BY VOLUME OF SAID LIGHT OIL OF CONCENTRATED SULPHURIC ACID AND WITH BETWEEN ABOUT 0.1 AND 1.0% BY VOLUME OF SAID LIGHT OIL OF A CRUDE SOLVENT NAPHTHA FRACTION HAVING A BOILING RANGE BETWEEN ABOUT 160*C. AND 205*C., (1) SAID FRACTION CONTAINING INDENE IN THE RANGE BETWEEN ABOUT 0.035% AND .450% BY WEIGHT OF SAID LIGHT OIL. (B) CONTINUALALY MIXING SAID LIGHT OIL, SAID SULPHURIC ACID AND SAID FRACTION FOR A PERIOD BETWEEN ABOUT 1.5 AND 4.25 HOURS AT A TEMPERATURE IN THE RANGE OF ABOUT 15*C. AND 60*C., (C) ALLOWING SAID MIXTURE TO SEPARATE INTO AN ACID LAYER AND AN OIL LAYER, AND (D) SEPARATING SAID ACID FROM SAID OIL LAYER AND THEREBY RECOVERING LIGHT OIL HAVING A THIOPHENE CONTENT OF LESS THAN ABOUT 30.4 P.P.M. SAID LIGHT OIL.
Claim 2
Independent Claim
170 words
A METHOD OF SUBSTANTIALLY REMOVING THIOPHENES FROM LIGHT OIL PRODUCED IN COAL DISTILLATION AND HAVING ABOUT 5000-7000 PARTS PER MILLION OF THIOPHENE, WHICH METHOD COMPRISES THE STEPS OF: (A) INTIMATELY MIXING SAID LIGHT OIL WITH BETWEEN ABOUT 3.25 AND 4.5, BY VOLUME OF SAID LIGHT OIL OF CONCENTRATED SULPHURIC ACID AND WITH BETWEEN ABOUT 0.1 AND 1.0% BY VOLUME OF SAID LIGHT OIL OF A CRUDE SOLVENT NAPHTHA FRACTION HAVING A BOILING RANGE BETWEEN ABOUT 160*C. AND 205*C., (1) SAID FRACTION CONTAINING INDENE IN THE RANGE BETWEEN ABOUT 0.035% AND .450% BY WEIGHT OF SAID LIGHT OIL. (B) CONTINUALALY MIXING SAID LIGHT OIL, SAID SULPHURIC ACID AND SAID FRACTION FOR A PERIOD BETWEEN ABOUT 1.5 AND 4.25 HOURS AT A TEMPERATURE IN THE RANGE OF ABOUT 15*C. AND 60*C., (C) ALLOWING SAID MIXTURE TO SEPARATE INTO AN ACID LAYER AND AN OIL LAYER, AND (D) SEPARATING SAID ACID FROM SAID OIL LAYER AND THEREBY RECOVERING LIGHT OIL HAVING A THIOPHENE CONTENT OF LESS THAN ABOUT 30.4 P.P.M. SAID LIGHT OIL.
References Cited (Backward Citations)
US2376644A
Cited
US3265754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |