US3132078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of naphthalenic from nonnaphthalenic hydrocarbons
Assignee: Union Oil Company of California
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Filing: 1962-03-26
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Granted: 1964-05-05
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Expires: 1982-03-26
Abstract
No abstract record available.
Inventors
- 👤 Backlund Peter Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:47
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C10; C10G; C10G2300/00; C10G2300/10; C10G2300/1096; C10G2400/00; C10G2400/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A PROCESS FOR TREATING A HYDROCARBON MIXTURE BOILING WITHIN THE RANGE FROM ABOUT 390*F. TO ABOUT 520*F., AND COMPRISING NAPHTHALENIC AND NON-NAPHTHALENIC COMPONENTS WHICH ARE NOT SEPARABLE BY SIMPLE FRACTIONAL DISTILLATION, WHICH COMPRISES AZEOTROPICALLY DISTILLING SAID MIXTURE TOGETHER WITH AN N-ALKYLPYRROLIDONE, IN WHICH THE ALKYL RADICAL CONTAINS NO MORE THAN 4 CARBON ATOMS, TO VAPORIZE SAID NON-NAPHTHALENIC COMPONENTS TOGETHER WITH SAID N-ALKYLPYRROLIDONE AS A MINIMUM BOILING AZEOTROPIC DISTILLATE, THEREBY LEAVING A BOTTOMS PRODUCT IN WHICH THE RATIO OF NAPHTHALENIC TO NON-NAPHTHALENIC HYDROCARBONS IS SUBSTANTIALLY GREATER THAN THE RATIO THEREOF IN SAID HYDROCARBON MIXTURE.
Claim 2
Dependent Claim
93 words
A PROCESS FOR TREATING A HYDROCARBON MIXTURE BOILING WITHIN THE RANGE FROM ABOUT 390*F. TO ABOUT 520*F., AND COMPRISING NAPHTHALENIC AND NON-NAPHTHALENIC COMPONENTS WHICH ARE NOT SEPARABLE BY SIMPLE FRACTIONAL DISTILLATION, WHICH COMPRISES AZEOTROPICALLY DISTILLING SAID MIXTURE TOGETHER WITH AN N-ALKYLPYRROLIDONE, IN WHICH THE ALKYL RADICAL CONTAINS NO MORE THAN 4 CARBON ATOMS, TO VAPORIZE SAID NON-NAPHTHALENIC COMPONENTS TOGETHER WITH SAID N-ALKYLPYRROLIDONE AS A MINIMUM BOILING AZEOTROPIC DISTILLATE, THEREBY LEAVING A BOTTOMS PRODUCT IN WHICH THE RATIO OF NAPHTHALENIC TO NON-NAPHTHALENIC HYDROCARBONS IS SUBSTANTIALLY GREATER THAN THE RATIO THEREOF IN SAID HYDROCARBON MIXTURE.
Claim 3
Independent Claim
88 words
A METHOD FOR THE RECOVERY OF SUBSTANTIALLY PURE NAPHTHALENE FROM A PETROLEUM FRACTION COMPRISING NAPHTHALENIC AND NON-NAPHTHALENIC COMPONENTS NOT READILY SEPARABLE BY SIMPLE FRACTIONAL DISTILLATION, BOILING WITHIN THE RANGE FROM ABOUT 400*F. TO ABOUT 520*F., WHICH COMPRISES: (1) SUBJECTING SAID FRACTION TO AZEOTROPIC DISTILLATION IN ADMIXTURE WITH N-METHYLPYRROLIDONE UNTIL A MAJOR PROPORTION OF THE NON-NAPHTHALENIC HYDROCARBONS IN SAID FRACTION WHICH BOIL WITHIN ABOUT 10 FAHRENHEIT DEGREES OF NAPHTHALENE IS DISTILLED OVERHEAD WITH NMETHYLPYRROLIDONE AS AN AZEOTROPIC DISTILLATE; AND (2) RECOVERING SUBSTANTIALLY PURE NAPHTHALENE FROM THE REMAINING BOTTOMS FRACTION.
Claim 4
Independent Claim
88 words
A METHOD FOR THE RECOVERY OF SUBSTANTIALLY PURE NAPHTHALENE FROM A PETROLEUM FRACTION COMPRISING NAPHTHALENIC AND NON-NAPHTHALENIC COMPONENTS NOT READILY SEPARABLE BY SIMPLE FRACTIONAL DISTILLATION, BOILING WITHIN THE RANGE FROM ABOUT 400*F. TO ABOUT 520*F., WHICH COMPRISES: (1) SUBJECTING SAID FRACTION TO AZEOTROPIC DISTILLATION IN ADMIXTURE WITH N-METHYLPYRROLIDONE UNTIL A MAJOR PROPORTION OF THE NON-NAPHTHALENIC HYDROCARBONS IN SAID FRACTION WHICH BOIL WITHIN ABOUT 10 FAHRENHEIT DEGREES OF NAPHTHALENE IS DISTILLED OVERHEAD WITH NMETHYLPYRROLIDONE AS AN AZEOTROPIC DISTILLATE; AND (2) RECOVERING SUBSTANTIALLY PURE NAPHTHALENE FROM THE REMAINING BOTTOMS FRACTION.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |