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US4433186A
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Catalysts for para-ethyltoluene dehydrogenation
Assignee: Mobil Oil AS
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Filing: 1983-06-02
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Granted: 1984-02-21
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Expires: 2003-06-02
Abstract
Abstract Para-ethyltoluene dehydrogenation catalyst compositions and processes for using such catalysts are provided. The catalyst compositions comprise a catalytically active iron compound, e.g., iron oxide; a potassium catalyst promoter, e.g., potassium carbonate; an optional chromium compound stabilizer, e.g., chromic oxide, and a gallium compound, e.g., gallium trioxide. Utilization of particular amounts of gallium compound in dehydrogenation catalyst compositions of this type will provide a catalyst especially suitable for promoting the selective dehydrogenation of para-ethyltoluene to form para-methylstyrene with sustained catalyst activity, with minimized aromatic ring loss and with minimal formation of popcorn polymer from the reaction effluent.
Inventors
- 👤 Chin-Chiun Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/825; B01J23/84; B01J23/85; B01J23/86; B01J23/862; C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
A process for the dehydrogenation of para-ethyltoluene to selectively form para-methylstyrene, said process comprising contacting a feed comprising para-ethyltoluene and steam under steam dehydrogenation reaction conditions with a catalyst composition comprising: a. from about 30% to 60% by weight of iron oxide, calculated as ferric oxide; b. from about 13% to 48% by weight of potassium compound, calculated as potassium oxide; c. from about 0% to about 5% of chromium compound, calculated as chromic oxide; and d. from about 1% to 15% by weight of a gallium compound, calculated as gallium trioxide.
Claim 2
Dependent Claim
92 words
A process for the dehydrogenation of para-ethyltoluene to selectively form para-methylstyrene, said process comprising contacting a feed comprising para-ethyltoluene and steam under steam dehydrogenation reaction conditions with a catalyst composition comprising: a. from about 30% to 60% by weight of iron oxide, calculated as ferric oxide; b. from about 13% to 48% by weight of potassium compound, calculated as potassium oxide; c. from about 0% to about 5% of chromium compound, calculated as chromic oxide; and d. from about 1% to 15% by weight of a gallium compound, calculated as gallium trioxide.
Claim 3
Dependent Claim
133 words
A process for the dehydrogenation of para-ethyltoluene to selectively form para-methylstyrene, said process comprising contacting a feed comprising para-ethyltoluene and steam with a catalyst composition comprising: a. from about 30% to 60% by weight of iron oxide, calculated as ferric oxide; b. from about 13% to 48% by weight of potassium compound, calculated as potassium oxide; c. from about 0% to about 5% of chromium compound, calculated as chromic oxide; and d. from about 1% to 15% by weight of a gallium compound, calculated as gallium trioxide; said contacting occurring under steam dehydrogenation conditions which include a temperature of from about 500° C. to 700° C., a liquid hourly space velocity for para-ethyltoluene of from about 0.3 to 3 and a steam to hydrocarbon ratio in said feed of about 1:1 to 5:1.
Claim 4
Dependent Claim
133 words
A process for the dehydrogenation of para-ethyltoluene to selectively form para-methylstyrene, said process comprising contacting a feed comprising para-ethyltoluene and steam with a catalyst composition comprising: a. from about 30% to 60% by weight of iron oxide, calculated as ferric oxide; b. from about 13% to 48% by weight of potassium compound, calculated as potassium oxide; c. from about 0% to about 5% of chromium compound, calculated as chromic oxide; and d. from about 1% to 15% by weight of a gallium compound, calculated as gallium trioxide; said contacting occurring under steam dehydrogenation conditions which include a temperature of from about 500° C. to 700° C., a liquid hourly space velocity for para-ethyltoluene of from about 0.3 to 3 and a steam to hydrocarbon ratio in said feed of about 1:1 to 5:1.
Claim 5
Dependent Claim
73 words
A process in accordance with claim 2 wherein a. the iron oxide comprises from about 35% to 55% by weight of the catalyst composition; b. the potassium compound comprises from about 27% to 41% by weight of the catalyst composition; c. the chromium compound comprises from about 1% to 4% by weight of the catalyst composition; and d. the gallium compound comprises from about 2% to 10% by weight of the catalyst composition.
Claim 6
Dependent Claim
24 words
A process in accordance with claim 3 wherein the weight ratio of steam to para-ethyltoluene in the feed ranges from about 1.5:1 to 4:1.
Claim 7
Dependent Claim
42 words
A process in accordance with claim 2 wherein said catalyst composition additionally contains up to about 20% by weight of a binder/filler component selected from the group consisting of portland cement, calcium aluminate, sawdust, carbon, wood flour, graphite, methylcellulose and mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |