Patent US4029716A successfully refreshed from Google Patents.
US4029716A
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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: 1977-06-14
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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 having combined therewith boron in an amount of at least about 0.2 percent by weight.
Inventors
- 👤 Warren W. Kaeding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:37
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2/864; C07C6/00; C07C6/08; C07C6/12; C07C6/123; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
A process for the selective production of paraxylene which comprises contacting toluene at a temperature between about 400° and about 700° C., a pressure between about 1 atmosphere and about 1000 psig and a weight hourly space velocity of between about 1 and about 20 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 zeolite having combined therewith boron in an amount of at least about 0.2 percent by weight as a result of reaction of said zeolite with a boron-containing compound; cooling the resulting product and separating para-xylene therefrom.
Claim 2
Dependent Claim
115 words
A process for the selective production of paraxylene which comprises contacting toluene at a temperature between about 400° and about 700° C., a pressure between about 1 atmosphere and about 1000 psig and a weight hourly space velocity of between about 1 and about 20 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 zeolite having combined therewith boron in an amount of at least about 0.2 percent by weight as a result of reaction of said zeolite with a boron-containing compound; cooling the resulting product and separating para-xylene therefrom.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said zeolite has a silica to alumina ratio of at least about 30.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the boron content is between about 1.5 and about 10 weight percent.
Claim 5
Dependent Claim
38 words
The process of claim 1 wherein said boroncontaining catalyst, prior to contact with toluene, is heated in the presence of oxygen at a temperature of from about 150° C. to about 500° C. for 3 to 24 hours.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the boron content is between about 1 and about 20 weight percent.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is ZSM-5.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is ZSM-11.
Claim 9
Dependent Claim
13 words
The process of claim 6 wherein ZSM-5 is predominantly in the hydrogen form.
Claim 10
Dependent Claim
15 words
The process of claim 6 wherein ZSM-5 is present in combination with a binder therefor.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein the source of boron is boric acid.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |