Patent US3965210A successfully refreshed from Google Patents.
US3965210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective production of para-xylene and catalyst therefor
Assignee: Mobil Oil AS
•
Filing: 1975-01-06
•
Granted: 1976-06-22
•
Expires: 1995-01-06
Abstract
Abstract Catalyst of a crystalline aluminosilicate zeolite, 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, the surface of which catalyst has been modified by contact with a polymer made up of meta-carborane units connected by siloxane units and process for the selective production of para-xylene by methylation of toluene in the presence of said catalyst.
Inventors
- 👤 Chin-Chiun Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:18
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/86; C07C2/862; C07C2/865; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/65; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2876; C07C2/861; C07C2/864; C07C2/868; B01J2229/00; B01J2229/30; B01J2229/37; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S208/00; Y10S208/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
A process for the selective production of para-xylene which comprises reacting toluene with a methylating agent in the presence of a catalyst of a crystalline alumino-silicate zeolite, 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, the surface of said catalyst having been modified by contact with a polymer made up of meta-carbonate units connected by siloxane units and of a size sufficiently large as to be unable to penetrate the zeolite pore structure.
Claim 2
Dependent Claim
90 words
A process for the selective production of para-xylene which comprises reacting toluene with a methylating agent in the presence of a catalyst of a crystalline alumino-silicate zeolite, 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, the surface of said catalyst having been modified by contact with a polymer made up of meta-carbonate units connected by siloxane units and of a size sufficiently large as to be unable to penetrate the zeolite pore structure.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the crystalline aluminosilicate zeolite is ZSM-5.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the crystalline aluminosilicate zeolite is ZSM-11.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the crystalline aluminosilicate zeolite is ZSM-21.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the crystalline aluminosilicate zeolite is ZSM-35.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein said methylating agent is methanol, methylchloride, methylbromide, dimethylether or dimethylsulfide.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein said polymer has a molecular weight of between about 9000 and about 20000.
Claim 9
Dependent Claim
64 words
The process of claim 1 wherein the step of reacting toluene with a methylating agent is carried out at a temperature between about 300°C. and about 500°C., a pressure of between about 1 atmosphere and about 1000 psig, a weight space velocity of between about 1 and about 2000, employing a molar ratio methylating agent to toluene of between about 0.05 and about 5.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein said crystalline aluminosilicate zeolite is characterized by a silica/alumina ratio in excess of 30.
Claim 11
Dependent Claim
69 words
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, the surface of which has been modified by contact with a polymer made up of meta-carborane units connected by siloxane units and of a size sufficiently large as to be unable to penetrate the zeolite pore structure.
Claim 12
Dependent Claim
69 words
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, the surface of which has been modified by contact with a polymer made up of meta-carborane units connected by siloxane units and of a size sufficiently large as to be unable to penetrate the zeolite pore structure.
Claim 13
Dependent Claim
18 words
The catalyst of claim 10 wherein said polymer has a molecular weight between about 9000 and about 20000.
Claim 14
Dependent Claim
12 words
The catalyst of claim 10 wherein the crystalline aluminosilicate zeolite is ZSM-5.
Claim 15
Dependent Claim
12 words
The catalyst of claim 10 wherein the crystalline aluminosilicate zeolite is ZSM-11.
Claim 16
Dependent Claim
12 words
The catalyst of claim 10 wherein the crystalline aluminosilicate zeolite is ZSM-21.
Claim 17
Dependent Claim
12 words
The catalyst of claim 10 wherein the crystalline aluminosilicate zeolite is ZSM-35.
References Cited (Backward Citations)
US3036980A
Cited
US3254034A
Cited
US3277018A
Cited
US3398177A
Cited
US3484428A
Cited
US3725302A
Cited
US3682996A
Cited
US3751506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |