US3420908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cyclohexane
Assignee: Phillips Petroleum Co
•
Filing: 1966-08-19
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Granted: 1969-01-07
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Expires: 1986-08-19
Abstract
No abstract record available.
Inventors
- 👤 Fred T Sherk
- 👤 John F Hutto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:31
CPC Classifications
C; C07; C07C; C07C13/00; C07C13/02; C07C13/16; C07C13/18; C07C4/00; C07C4/08; C07C5/00; C07C5/02; C07C5/10; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2521/08; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/42; C07C2523/44; C07C2523/70; C07C2523/74; C07C2523/755; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR MAKING CYCLOHEXANE COMPRISING THE STEPS OF COMBINING FRESH TOLUENE FEED WITH RECYCLED TOLUENE AND CYCLOHEXANE; PASSING SAID COMBINATION OF TOLUENE AND CYCLOHEXANE TO A THERMAL HYDROGENATION ZONE; HYDROGENATING SAID TOLUENE TO METHYLCYCLOHEXANE IN THE PRESENCE OF A SUITABLE HYDROGENATION CATALYST AND HYDROGEN; WITHDRAWING FROM SAID HYDROGENATION ZONE EFFLUENT COMPRISING METHYLCYCLOHEXANE AND CYCLOHEXANE; RECOVERING CYCLOHEXANE FROM SAID EFFLUENT; PASSING SAID METHYLCYCLOHEXANE TO A DEALKYLATION ZONE; DEALKYLATING SAID METHYLCYCLOHEXANE TO CYCLOHEXANE IN THE PRESENCE OF HYDROGEN AND A SUITABLE DEALKYLATION CATALYST; WITHDRAWING FROM SAID HYDRODEALKYLATION ZONE EFFLUENT COMPRISING TOLUENE AND CYCLOHEXANE; RECYCLING SAID TOLUENE AND CYCLOHEXANE TO THE HYDROGENATION ZONE.
Claim 2
Dependent Claim
101 words
A PROCESS FOR MAKING CYCLOHEXANE COMPRISING THE STEPS OF COMBINING FRESH TOLUENE FEED WITH RECYCLED TOLUENE AND CYCLOHEXANE; PASSING SAID COMBINATION OF TOLUENE AND CYCLOHEXANE TO A THERMAL HYDROGENATION ZONE; HYDROGENATING SAID TOLUENE TO METHYLCYCLOHEXANE IN THE PRESENCE OF A SUITABLE HYDROGENATION CATALYST AND HYDROGEN; WITHDRAWING FROM SAID HYDROGENATION ZONE EFFLUENT COMPRISING METHYLCYCLOHEXANE AND CYCLOHEXANE; RECOVERING CYCLOHEXANE FROM SAID EFFLUENT; PASSING SAID METHYLCYCLOHEXANE TO A DEALKYLATION ZONE; DEALKYLATING SAID METHYLCYCLOHEXANE TO CYCLOHEXANE IN THE PRESENCE OF HYDROGEN AND A SUITABLE DEALKYLATION CATALYST; WITHDRAWING FROM SAID HYDRODEALKYLATION ZONE EFFLUENT COMPRISING TOLUENE AND CYCLOHEXANE; RECYCLING SAID TOLUENE AND CYCLOHEXANE TO THE HYDROGENATION ZONE.
References Cited (Backward Citations)
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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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |