US4007231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective production of para-xylene
Assignee: Mobil Oil AS
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Filing: 1975-11-24
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Granted: 1977-02-08
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Expires: 1995-11-24
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, a C5-C10 naphthene, a C3-C10 paraffin, and mixtures of the foregoing with a catalyst comprising a composite of a crystalline aluminosilicate zeolite and antimony oxide, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12.
Inventors
- 👤 Stephen Allan Butter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/868; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/48; B01J29/90; C07C2/76; C07C2/862; C07C2/864; C07C2/865; C07C6/00; C07C6/08; C07C6/12; C07C6/123; C07C2523/00; C07C2523/16; C07C2523/18; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/48; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/584
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A process for the selective production of para-xylene which comprises contacting toluene under disproportionation conditions, with a catalyst comprising a composite of a crystalline aluminosilicate zeolite and antimony oxide, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, collecting the resultant product and separating para-xylene therefrom.
Claim 2
Dependent Claim
62 words
A process for the selective production of para-xylene which comprises contacting toluene under disproportionation conditions, with a catalyst comprising a composite of a crystalline aluminosilicate zeolite and antimony oxide, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, collecting the resultant product and separating para-xylene therefrom.
Claim 3
Dependent Claim
43 words
The process of claim 1 wherein said conversion conditions include a temperature between about 400° and about 700° C., a pressure of 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
24 words
The process of claim 1 wherein the amount of Sb 2 O 3 in said catalyst is between about 6 and about 40 percent.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the amount of Sb 2 O 3 in said catalyst is between about 10 and about 35 percent.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is ZSM-5.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is HZSM-5.
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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |