US2741646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of xylenes
Assignee: Phillips Petroleum Co
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Filing: 1953-04-07
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Granted: 1956-04-10
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Expires: 1973-04-07
Abstract
No abstract record available.
Inventors
- 👤 Clark Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:23
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/08; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2735; C07C7/00; C07C7/14; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
THE PROCESS OF PRODUCING PARA-XYLENE WHICH COMPRISES INTRODUCING A NAPHTHA BOILING IN THE RANGE OF BETWEEN 220* F. AND 300* F. TOGETHER WITH HYDROIGEN IN A HYDROGEN-HYDROCARBON MOL RATION OF BETWEEN 0.5-1 AND 20-1 TO CONTACT WITH A REFORMING CATALYST AT A TEMPERATURE WITHIN THE RANGE OF BETWEEN 700* F. AND 1000* F., AT A PRESSURE OF ATMOSPHERIC TO 1000 P.S.I.G., AND LIQUID HOURLY SPACE VELOCITY OF 0.3-10; SEPARATING A XYLENE CONCENTRATE FROM THE EFFLUENT RESULTING FROM SAID CONTACTING; COOLING SAID XYLENES TO A TEMPERATURE OF BETWEEN -70* F. SAID -115* F. SO AS TO CRYSTALLIZE PARA-XYLENE FROM SAID CONCENTRATE; PASSING UNCRYSTALLIZED MATERIAL TO CONTACT WITH A SOLID GRANULAR ADSORBENT CONTACT CATALYST CONSISTING ESSENTIALLY OF SYNTHETIC SILICA GAL AND FROM 0.1 TO 2 PER CENT BY WEIGHT OF ALUMINA AT A TEMPERATURE WITHIN THE RANGE OF BETWEEN 600* F. AND 1000* F., AT A PRESSURE OF ATMOSPHERIC TO 1000 P.S.I.G., AND A LIQUID HOURLY SPACE VELOCITY OF 0.3 TO 10 SAID SYNTHETIC SILICA GEL CAT-
Claim 2
Dependent Claim
165 words
THE PROCESS OF PRODUCING PARA-XYLENE WHICH COMPRISES INTRODUCING A NAPHTHA BOILING IN THE RANGE OF BETWEEN 220* F. AND 300* F. TOGETHER WITH HYDROIGEN IN A HYDROGEN-HYDROCARBON MOL RATION OF BETWEEN 0.5-1 AND 20-1 TO CONTACT WITH A REFORMING CATALYST AT A TEMPERATURE WITHIN THE RANGE OF BETWEEN 700* F. AND 1000* F., AT A PRESSURE OF ATMOSPHERIC TO 1000 P.S.I.G., AND LIQUID HOURLY SPACE VELOCITY OF 0.3-10; SEPARATING A XYLENE CONCENTRATE FROM THE EFFLUENT RESULTING FROM SAID CONTACTING; COOLING SAID XYLENES TO A TEMPERATURE OF BETWEEN -70* F. SAID -115* F. SO AS TO CRYSTALLIZE PARA-XYLENE FROM SAID CONCENTRATE; PASSING UNCRYSTALLIZED MATERIAL TO CONTACT WITH A SOLID GRANULAR ADSORBENT CONTACT CATALYST CONSISTING ESSENTIALLY OF SYNTHETIC SILICA GAL AND FROM 0.1 TO 2 PER CENT BY WEIGHT OF ALUMINA AT A TEMPERATURE WITHIN THE RANGE OF BETWEEN 600* F. AND 1000* F., AT A PRESSURE OF ATMOSPHERIC TO 1000 P.S.I.G., AND A LIQUID HOURLY SPACE VELOCITY OF 0.3 TO 10 SAID SYNTHETIC SILICA GEL CAT-
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) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |