US4192961A
Expired / Lapsed
US
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Method and catalyst for preparing styrene
Assignee: Individual
•
Filing: 1977-10-04
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Granted: 1980-03-11
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Expires: 1997-10-04
Abstract
Abstract A method and catalyst for preparing styrene which comprises dehydrodimerization of toluene, followed by conversion of the resulting dehydrodimerization products to styrene. The conversion is conducted in the presence of ethylene using a catalyst consisting of chromium oxide, tungsten oxide and an alkali metal oxide supported by a carrier. The method according to the present invention makes it possible to increase the yield of styrene and simplify the process technology.
Inventors
- 👤 Sergei A. Polyakov
- 👤 Aron L. Shapiro
- 👤 Viktor J. Gankin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:53
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/40; C07C15/42; C07C15/44; C07C15/46; C07C6/00; C07C6/02; C07C6/04; C07C6/08; C07C2521/00; C07C2521/12; C07C2523/00; C07C2523/02; C07C2523/04; C07C2523/16; C07C2523/24; C07C2523/26; C07C2523/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A method for preparing styrene which comprises dehydrodimerization of toluene with a subsequent catalytic conversion of the resulting dehydrodimerization products to styrene at a temperature ranging from 300° to 600° C. in the presence of ethylene using a catalyst consisting of the following components, percent by weight: ______________________________________
chromium oxide 1.5 to 5.2
tungsten oxide 4.0 to 6.1
an oxide of an alkali metal
0.1 to 0.7
______________________________________ a carrier selected from the group consisting of silica and alumosilicate the balance.
Claim 2
Independent Claim
81 words
A method for preparing styrene which comprises dehydrodimerization of toluene with a subsequent catalytic conversion of the resulting dehydrodimerization products to styrene at a temperature ranging from 300° to 600° C. in the presence of ethylene using a catalyst consisting of the following components, percent by weight: ______________________________________
chromium oxide 1.5 to 5.2
tungsten oxide 4.0 to 6.1
an oxide of an alkali metal
0.1 to 0.7
______________________________________ a carrier selected from the group consisting of silica and alumosilicate the balance.
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) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |