Patent US4100215A successfully refreshed from Google Patents.
US4100215A
Expired / Lapsed
US
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Selective production of para-xylene
Assignee: Mobil Oil AS
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Filing: 1976-09-27
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Granted: 1978-07-11
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Expires: 1996-09-27
Abstract
Abstract Process for the selective production of paraxylene by methylaton of toluene in the presence of a catalyst comprising a crystalline aluminosilicate zeolite characterized by (1) a silica to alumina ratio of at least about 12, (2) a constraint index within the approximate range of 1 to 12 and (3) a crystal size greater than 1 micron.
Inventors
- 👤 Nai Y. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:55
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2/865; C07C2/861; C07C2/864; C07C2/868; B; B01; B01J; B01J2229/00; B01J2229/10; B01J2229/12; B01J2229/30; B01J2229/32; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
In a process for manufacture of xylene by reacting toluene with a methylating agent in the presence of a crystalline aluminosilicate zeolite catalyst, the improvement resulting in a proportion of para-xylene greater than the thermodynamic equilibrium proportion of total xylenes which comprises conducting the reaction at a temperature between about 400° and about 500° C in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, which has not undergone prior surface deactivation by treatment with a compound of nitrogen or silicon, characterized by (1) a silica to alumina ratio of at least about 12, (2) a constraint index within the approximate range of 1 to 12 and (3) a crystal size greater than 1 micron.
Claim 2
Dependent Claim
116 words
In a process for manufacture of xylene by reacting toluene with a methylating agent in the presence of a crystalline aluminosilicate zeolite catalyst, the improvement resulting in a proportion of para-xylene greater than the thermodynamic equilibrium proportion of total xylenes which comprises conducting the reaction at a temperature between about 400° and about 500° C in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, which has not undergone prior surface deactivation by treatment with a compound of nitrogen or silicon, characterized by (1) a silica to alumina ratio of at least about 12, (2) a constraint index within the approximate range of 1 to 12 and (3) a crystal size greater than 1 micron.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said crystal size is greater than 3 microns.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein said methylating agent is methanol, methylchloride, methylbromide, dimethylether or dimethylsulfide.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein said crystal size is in the approximate range of 3 to 10 microns.
Claim 6
Dependent Claim
58 words
The process of claim 1 wherein the step of reacting toluene with a methylating agent is carried out at a pressure of between about 1 atmosphere and about 1000 psig, a weight hourly space velocity of between about 0.5 and about 10 employing a molar ratio of methylating agent to toluene of between about 0.5 and about 5.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said crystalline aluminosilicate is characterized by a silica/alumina ratio in excess of 30.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the crystalline aluminosilicate catalyst is ZSM-5.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the crystalline aluminosilicate is ZSM-11.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein the crystalline aluminosilicate is ZSM21.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein said methylating agent is methanol.
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) | 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 |