US3855328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isomerization and/or transalkylation and/or disproportionation of alkylnaphthalenes
Assignee: Sun Research and Development Co
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Filing: 1971-12-14
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Granted: 1974-12-17
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Expires: 1991-12-14
Abstract
Abstract Alumino-silicate zeolites (preferably zeolites containing polyvalent metal cations) can be used to catalyze alkyl transfer, e.g., isomerization, transalkylation and disproportionation of alkylnaphthalenes. The ''''water'''' content of the zeolite and the reaction conditions (particularly temperature and space velocity) can be selected so as to favor one such reaction over the others. The preferred zeolites are at least 10 percent crystalline by Xray, can adsorb benzene, and have an atomic ratio Al/Si in the range of 1.0-0.1. One preferred zeolite has the faujasite framework structure (e.g., Linde Type Y) and contains rare earth cations (e.g., Ce and/or La etc.).
Inventors
- 👤 J Hedge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:31
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/126; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2737; C07C6/123; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
20 words
35-1.0 AND CONTAINING IN THE RANGE OF 2-12 WT. PERCENT WATER WHICH CAN BE EVOLVED ON IGNITION ANALYSIS AT 1,900*F.
Claim 2
Dependent Claim
53 words
PROCESS FOR ISOMERIZATION, DISPROPORTIONATION OR TRANSALKYLATION OF A FEED CONSISTING ESSENTIALLY OF METHYL NAPHTHALENES COMPRISING CONTACTING SAID FEED, AT A CONVERSION TEMPERATURE, WITH A CRYSTALLINE ZEOLITE CATALYST CONTAINING CATIONS OF LANTHANUM OR AT LEAST ONE RARE EARTH METAL, SAID ZEOLITE CATALYST HAVING A FRAMEWORK WITH AN ATOMIC RATIO AL/SI IN THE RANGE OF
Claim 3
Dependent Claim
22 words
Process of claim 1 wherein said water content is in the range of 3-6 wt percent and wherein isomerization predominates over disproportionation.
Claim 4
Dependent Claim
10 words
Process of claim 2 wherein said methylnaphthalene is a dimethylnaphthalene.
Claim 5
Dependent Claim
13 words
Process according to claim 1 wherein said framework is of the faujasite structure.
Claim 6
Dependent Claim
32 words
Process of claim 1 wherein said catalyst contains, on an ignited basis, less than 1 wt percent of sodium and at least 8 percent of cerium or lanthanum or a mixture thereof.
Claim 7
Dependent Claim
14 words
Process of claim 2 wherein said conversion temperature is in the range of 120*-200*C.
Claim 8
Dependent Claim
29 words
Process of claim 1 wherein disproportionation occurs and wherein said conversion temperature is in the range of 200*-240*C and said feed contains trimethylnaphthalenes and monomethylnaphthalenes in about equimolar ratio.
Claim 9
Dependent Claim
40 words
Process of claim 3 wherein 1,6-dimethylnaphthalene is isomerized to 2,6-dimethylnaphthalene and wherein said feed is a 507*-520*F heart-cut from an extract obtained by extraction with an aromatic selective solvent of a catalytic gas oil boiling in about the 480*-520*F. range.
Claim 10
Dependent Claim
66 words
Process for the transalkylation of alkyl naphthalenes, comprising contacting an alkyl naphthalene feed material with a crystalline zeolite catalyst containing cations of lanthanum or cations of at least one rare earth metal and having a framework with an atomic ratio Al/Si in the range of 0.35 to 0.65 while maintaining an elevated temperature sufficiently high as to cause alkyl transfer of said alkyl naphthalene feed material.
Claim 11
Dependent Claim
19 words
Process of claim 9 wherein said contacting is at about atmospheric pressure in the substantial absence of molecular hydrogen.
Claim 12
Dependent Claim
21 words
Process of claim 9 wherein said feed material contains a methylnaphthalene and wherein there occurs an alkyl transfer of said methylnaphthalene.
Claim 13
Dependent Claim
15 words
Process of claim 9 wherein said zeolite also contains a platinum group metal hydrogenation catalyst.
Claim 14
Dependent Claim
26 words
Process of claim 12 wherein said zeolite catalyst contains in the range of 2-12 weight percent water which can be evolved on ignition analysis at 1,900*F.
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |