Patent US517182A successfully refreshed from Google Patents.
US4100214A
Expired / Lapsed
US
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Isomerization of monocyclic alkyl aromatic hydrocarbons
Assignee: Mobil Oil AS
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Filing: 1976-05-07
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Granted: 1978-07-11
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Expires: 1996-05-07
Abstract
Abstract A process is provided for isomerization of monocyclic alkyl aromatic hydrocarbons in a reaction zone maintained under conditions such that said isomerization is accomplished in the vapor phase.
Inventors
- 👤 Francis G. Dwyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:41
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/46; C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2708; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
A process for effecting catalytic isomerization of xylenes which comprises contacting said xylenes in the vapor phase with hydrogen at a temperature of from about 450° to about 900° F, a pressure of from about 50 psig to about 500 psig, a hydrogen/hydrocarbon mole ratio of from about 0.1 to about 100 and a weight hourly space velocity of from about 0.1 to about 200 in the presence of from about 3 to about 30 combined weight percent, based upon weight of the xylene feed, of diluent of toluene and C 9 + recycle material and a crystalline aluminosilicate zeolite characterized by a silica/alumina mole ratio of greater than 12 and a constraint index within the approximate range of 1 to 12 and containing cations which are selected from the group consisting of iron, nickel and cobalt.
Claim 2
Dependent Claim
137 words
A process for effecting catalytic isomerization of xylenes which comprises contacting said xylenes in the vapor phase with hydrogen at a temperature of from about 450° to about 900° F, a pressure of from about 50 psig to about 500 psig, a hydrogen/hydrocarbon mole ratio of from about 0.1 to about 100 and a weight hourly space velocity of from about 0.1 to about 200 in the presence of from about 3 to about 30 combined weight percent, based upon weight of the xylene feed, of diluent of toluene and C 9 + recycle material and a crystalline aluminosilicate zeolite characterized by a silica/alumina mole ratio of greater than 12 and a constraint index within the approximate range of 1 to 12 and containing cations which are selected from the group consisting of iron, nickel and cobalt.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said zeolite is ZSM-5, ZSM-11, ZSM-12, ZSM-35 or ZSM-38.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein said zeolite is ZSM-5.
Claim 5
Dependent Claim
26 words
The process of claim 1 wherein said zeolite is combined in an amount of from about 30 to about 90 weight percent in a binder therefor.
Claim 6
Dependent Claim
10 words
The process of claim 4 wherein said binder is alumina.
Claim 7
Dependent Claim
26 words
The process of claim 2 wherein said zeolite is combined in an amount of from about 30 to about 90 weight percent in a binder therefor.
Claim 8
Dependent Claim
10 words
The process of claim 6 wherein said binder is alumina.
Claim 9
Dependent Claim
10 words
The process of claim 1 wherein said cations are nickel.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein said diluent is present at from about 5 to about 25 weight percent of the xylene mixture feed.
Claim 11
Dependent Claim
24 words
The process of claim 2 wherein said diluent is present at from about 5 to about 25 weight percent of the xylene mixture feed.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |