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US4049738A
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Selective production of para-xylene
Assignee: Mobil Oil AS
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Filing: 1976-07-12
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Granted: 1977-09-20
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Expires: 1996-07-12
Abstract
Abstract Process for the selective production of para-xylene by methylation of toluene in the presence of a catalyst comprising the crystalline aluminosilicate zeolite ZSM-23.
Inventors
- 👤 Lewis B. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:08
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2/865; C07C2/54; C07C2/64; C07C2/66; C07C2/861; C07C2/864; C07C2/868; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/70
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
A process for the selective production of para xylene which comprises reacting toluene with a methylating agent at a temperature between about 300° C. and about 750° C. in the presence of a catalyst comprising the crystalline aluminosilicate zeolite ZSM-23.
Claim 2
Dependent Claim
40 words
A process for the selective production of para xylene which comprises reacting toluene with a methylating agent at a temperature between about 300° C. and about 750° C. in the presence of a catalyst comprising the crystalline aluminosilicate zeolite ZSM-23.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said methylating agent is methanol, methylchloride, methylbromide, dimethylether or dimethylsulfide.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein said reacting takes place at a weight hourly space velocity of between about 5 and about 1500.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said methylating agent is methanol.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is in the hydrogen form.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is used in combination with a porous matrix.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein the molar ratio of methylating agent to toluene is between about .05 and about 5.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein said temperature is between about 400° C. and about 700° C.
Claim 10
Dependent Claim
20 words
The process of claim 4 wherein the molar ratio of methanol to toluene is between about 0.1 and about 2.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |