Patent US4049737A successfully refreshed from Google Patents.
US4049737A
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Propylation of toluene
Assignee: Mobil Oil AS
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Filing: 1975-09-18
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Granted: 1977-09-20
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Expires: 1995-09-18
Abstract
Abstract Propylation of toluene with selective production of cymene is accomplished by vapor phase reaction of toluene and propylene at a temperature between about 400 DEG and about 600 DEG F. in the presence of a catalyst comprising 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.
Inventors
- 👤 Francis G. Dwyer
- 👤 Donald J. Klocke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:29
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2521/00; C07C2521/02; C07C2521/04; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
A process for the propylation of toluene with selective production of cymene consisting essentially of vapor phase reaction of toluene and propylene at a temperature between about 400° F. and about 500° F. and a weight hourly space velocity between about 0.5 and about 100 in the presence of a catalyst comprising ZSM-5 crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12.
Claim 2
Dependent Claim
69 words
A process for the propylation of toluene with selective production of cymene consisting essentially of vapor phase reaction of toluene and propylene at a temperature between about 400° F. and about 500° F. and a weight hourly space velocity between about 0.5 and about 100 in the presence of a catalyst comprising ZSM-5 crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the molar ratio of toluene to propylene is within the approximate range of 2 to 100.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the crystalline aluminosilicate zeolite is combined with a binder.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein said binder is alumina.
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 |