US4158024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective production of para-xylene
Assignee: Mobil Oil AS
•
Filing: 1977-05-03
•
Granted: 1979-06-12
•
Expires: 1997-05-03
Abstract
Abstract A catalytic process is provided for the selective production of para-xylene by contacting toluene, under methylation conditions, with a methylating agent in the presence of 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
2026-10-29 21:49
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: 10
Claim 1
Independent Claim
137 words
A process for the selective production of para-xylene which comprises contacting toluene, under methylation conditions, including a temperature between about 250° C. and about 750° C., a pressure between about 1 atmosphere and about 1000 psig and a weight hourly space velocity of between about 1 and about 2000, with a methylating agent in the presence of a catalyst comprising a crystalline aluminosilicate zeolite containing less than about 1.5 weight percent alkali metal, 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
137 words
A process for the selective production of para-xylene which comprises contacting toluene, under methylation conditions, including a temperature between about 250° C. and about 750° C., a pressure between about 1 atmosphere and about 1000 psig and a weight hourly space velocity of between about 1 and about 2000, with a methylating agent in the presence of a catalyst comprising a crystalline aluminosilicate zeolite containing less than about 1.5 weight percent alkali metal, 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
11 words
The process of claim 1 wherein said methylating agent is methanol.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the molar ratio of methylating agent to toluene is between about 0.05 and about 5.
Claim 5
Dependent Claim
30 words
The process of claim 1 wherein said temperature is between about 400° C. and about 600° C. and said liquid hourly space velocity is between about 5 and about 1500.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the magnesium content is between about 0.7 and about 25 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
13 words
The process of claim 6 wherein ZSM-5 is predominantly in the hydrogen form.
Claim 9
Dependent Claim
19 words
The process of claim 6 wherein ZSM-5, having magnesium combined therewith, is present in combination with a binder therefor.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein said zeolite, having magnesium combined therewith, is present in combination with a binder therefor.
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) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |