US4034053A
Expired / Lapsed
US
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Selective production of para-xylene
Assignee: Mobil Oil AS
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Filing: 1975-12-08
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Granted: 1977-07-05
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Expires: 1995-12-08
Abstract
Abstract A catalytic process is provided for the selective production of para-xylene by contacting, under conversion conditions, a charge stock containing, as a major reactant, at least one hydrocarbon selected from the group consisting of toluene, a C3-C10 olefin, and mixtures of the foregoing with a catalyst comprising a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12, a constraint index, as hereinafter defined, within the approximate range of 1 to 12 and which has combined therewith magnesium in an amount of at least about 0.5 percent by weight.
Inventors
- 👤 Warren W. Kaeding
- 👤 Lewis B. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:28
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2/864; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C07C6/00; C07C6/08; C07C6/12; C07C6/123; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
A process for the selective production of para-xylene which comprises contacting toluene, under disproportionation conditions, with a catalyst consisting essentially of a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, said catalyst having combined therewith magnesium in an amount of at least about 0.5 percent by weight, as a result of contact of said zeolite with a magnesium compound in the liquid phase, cooling the resulting product and separating para-xylene therefrom.
Claim 2
Dependent Claim
89 words
A process for the selective production of para-xylene which comprises contacting toluene, under disproportionation conditions, with a catalyst consisting essentially of a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, said catalyst having combined therewith magnesium in an amount of at least about 0.5 percent by weight, as a result of contact of said zeolite with a magnesium compound in the liquid phase, cooling the resulting product and separating para-xylene therefrom.
Claim 3
Dependent Claim
42 words
The process of claim 1 wherein said disproportionation conditions include a temperature between about 400 and about 750° C., a pressure between about 1 atmosphere and about 1000 psig utilizing a weight hourly space velocity of between about 1 and about 20.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the magnesium content is between about 0.7 and about 25 weight percent.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is ZSM-5.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein ZSM-5 is predominantly in the hydrogen form.
Claim 7
Dependent Claim
19 words
The process of claim 4 wherein ZSM-5, having magnesium combined therewith, is present in combination with a binder therefore.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein said zeolite, having magnesium combined therewith, is present in combination with a binder therefore.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |