US3150197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of durene
Assignee: Sinclair Research Inc
•
Filing: 1959-12-15
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Granted: 1964-09-22
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Expires: 1979-12-15
Abstract
No abstract record available.
Inventors
- 👤 Reading B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:44
CPC Classifications
C; C10; C10G; C10G61/00; C10G61/02; C10G2400/00; C10G2400/30; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR INCREASING THE DURENE OBTAINED FROM A PETROLEUM STRAIGHT-RUN NAPTHA HAVING AT LEAST ABOUT 10 VOLUME PERCENT C10 HYDROCARBONS BOILING IN THE APPROXIMATE 300 TO 410*F. RANGE WHICH COMPRISES CONTACTING SAID NAPHTHA IN A REFORMING ZONE WITH A PLATIUM METALALUMINA CATALYST AT A TEMPERATURE OF ABOUT 850-1000* F. AND A PRESSURE OF ABOUT 150-500 P.S.I.G. IN THE PRESENCE OF FREE HYDROGEN TO OBTAIN A LIQUID REFORMATE ENHANCED IN OCTANE RATING, SEPARATING A FRACTION OF SAID REFORMATE BOILING PRIMARILY IN THE RANGE OF ABOUT 350 TO 410*F. COOLING SAID SEPARATED FRACTION TO CRYSTALLIZE DURENE, SEPARATING SAID CRYSTALS FROM THE CRYSTALLIZATION MOTHER LIQUOR, OF AROMATIC HYDROCARBONS OF 10 CARBON ATOMS AND PASSING SAID MOTHER LIQUOR TO THE REFORMING ZONE, IN AN AMOUNT OF ABOUT 0.5 TO 10% OF SAID NAPHTHA.
Claim 2
Dependent Claim
130 words
A PROCESS FOR INCREASING THE DURENE OBTAINED FROM A PETROLEUM STRAIGHT-RUN NAPTHA HAVING AT LEAST ABOUT 10 VOLUME PERCENT C10 HYDROCARBONS BOILING IN THE APPROXIMATE 300 TO 410*F. RANGE WHICH COMPRISES CONTACTING SAID NAPHTHA IN A REFORMING ZONE WITH A PLATIUM METALALUMINA CATALYST AT A TEMPERATURE OF ABOUT 850-1000* F. AND A PRESSURE OF ABOUT 150-500 P.S.I.G. IN THE PRESENCE OF FREE HYDROGEN TO OBTAIN A LIQUID REFORMATE ENHANCED IN OCTANE RATING, SEPARATING A FRACTION OF SAID REFORMATE BOILING PRIMARILY IN THE RANGE OF ABOUT 350 TO 410*F. COOLING SAID SEPARATED FRACTION TO CRYSTALLIZE DURENE, SEPARATING SAID CRYSTALS FROM THE CRYSTALLIZATION MOTHER LIQUOR, OF AROMATIC HYDROCARBONS OF 10 CARBON ATOMS AND PASSING SAID MOTHER LIQUOR TO THE REFORMING ZONE, IN AN AMOUNT OF ABOUT 0.5 TO 10% OF SAID NAPHTHA.
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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |