Patent US3886223A successfully refreshed from Google Patents.
US3886223A
Expired / Lapsed
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Isomerization of isopropylnaphthalene alkylate mixtures
Assignee: Wyeth Holdings LLC
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Filing: 1974-05-01
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Granted: 1975-05-27
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Expires: 1994-05-01
Abstract
Abstract Alkylate mixture of alpha and beta isopropylnaphthalenes containing low ratios of beta/alpha isomer and which do not contain propylene are isomerized in the presence of a rare earth metal exchanged ''''Y'''' type aluminosilicate catalyst at a temperature of from about 200*C. to 325*C., a space velocity of from about 0.1 to 4 hour 1 and a pressure of from about 200 psig to 500 psig, to produce mixture having high beta/alpha isopropylnaphthalene ratios.
Inventors
- 👤 Herbert Rudolph Conrad Kemme
- 👤 Edward Jonathan Scharf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:27
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2737; C07C6/00; C07C6/08; C07C6/12; C07C6/126; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
A PROCESS FOR INCREASING THE BETA ISOPROPYLNAPHTHALENE CONTENT OF A MIXTURE CONTAINING ESSENTIALLY NAPHTHALENE, ALPHA AND BETA ISOPROPYLNAPHTHALENE AND DIISOPROPYLNAPHTHALENE, WHICH COMPRISES CONTACTING SAID MIXTURE WITH A RARE EARTH METAL EXCHANGED, SYNTHETIC, CRYSTALLINE "Y" TYPE ALUMINOSILICATE CATALYST AT A TEMPERATURE OF FROM ABOUT 200*C. TO 325*C., A SPACE VELOCITY OF FROM ABOUT 0.1 TO 4 HOUR-1, AND A PRESSURE OF FROM ABOUT 200 PSIG TO 500 PSIG, SAID MIXTURE HAVING AN EQUIVALENT NAPHTHALENE TO EQUIVALENT PROPYLENE RATIO OF FROM ABOUT 1 TO 10.
Claim 2
Dependent Claim
83 words
A PROCESS FOR INCREASING THE BETA ISOPROPYLNAPHTHALENE CONTENT OF A MIXTURE CONTAINING ESSENTIALLY NAPHTHALENE, ALPHA AND BETA ISOPROPYLNAPHTHALENE AND DIISOPROPYLNAPHTHALENE, WHICH COMPRISES CONTACTING SAID MIXTURE WITH A RARE EARTH METAL EXCHANGED, SYNTHETIC, CRYSTALLINE "Y" TYPE ALUMINOSILICATE CATALYST AT A TEMPERATURE OF FROM ABOUT 200*C. TO 325*C., A SPACE VELOCITY OF FROM ABOUT 0.1 TO 4 HOUR-1, AND A PRESSURE OF FROM ABOUT 200 PSIG TO 500 PSIG, SAID MIXTURE HAVING AN EQUIVALENT NAPHTHALENE TO EQUIVALENT PROPYLENE RATIO OF FROM ABOUT 1 TO 10.
Claim 3
Dependent Claim
35 words
A process according to claim 1 wherein the temperature is about 220*C., the space velocity is about 0.5 hour 1, the pressure is about 500 psig and the naphthalene to propylene ratio is about 3.
References Cited (Backward Citations)
US3251897A
Cited
US3845149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |