US4460706A
Expired / Lapsed
US
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Catalyst for the production of styrene
Assignee: Mitsubishi Chemical Corp
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Filing: 1983-04-12
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Granted: 1984-07-17
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Expires: 2003-04-12
Abstract
Abstract A catalyst for the production of styrene comprising 40-87.5 % by weight of iron oxide as Fe2O3, 11-50% by weight of cerium oxide as Ce2O3, and 1.5-40% by weight of potassium oxide as K2O. By use of the catalyst, styrene can be produced at high conversions and high selectivies under reaction conditions wherein the amount of steam used as a source of heat is reduced.
Inventors
- 👤 Makoto Imanari
- 👤 Makoto Takiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:53
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/83; C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A catalyst for the production of styrene by the catalytic dehydrogenation of ethylbenzene by heating with steam, consisting essentially of: 40 to 87.5% by weight of iron oxide as Fe 2 O 3 , 11 to 50% by weight of cerium oxide as Ce 2 O 3 , and 1.5 to 40% by weight of potassium oxide as K 2 O.
Claim 2
Dependent Claim
61 words
A catalyst for the production of styrene by the catalytic dehydrogenation of ethylbenzene by heating with steam, consisting essentially of: 40 to 87.5% by weight of iron oxide as Fe 2 O 3 , 11 to 50% by weight of cerium oxide as Ce 2 O 3 , and 1.5 to 40% by weight of potassium oxide as K 2 O.
Claim 3
Dependent Claim
28 words
The catalyst of claim 1 wherein the catalyst is prepared by calcining the mixed oxide mass of the catalyst over a temperature range of 800° to 1200° C.
Claim 4
Dependent Claim
28 words
The catalyst of claim 1, wherein the catalyst is prepared by calcining the mixed oxide mass of the catalyst over a temperature range of 900° to 1100° C.
Claim 5
Dependent Claim
29 words
The catalyst of claim 1, which comprises 45-80% by weight Fe 2 O 3 , 11-45% by weight Ce 2 O 3 and 6-35% by weight K 2 O.
Claim 6
Dependent Claim
15 words
The catalyst of claim 1, wherein the mixed oxide catalyst is supported on a carrier.
Claim 7
Dependent Claim
26 words
The catalyst of claim 1, wherein the steam/ethylbenzene molar ratio during the dehydrogenation of ethylbenzene over said catalyst is within the range of 3 to 9.
Claim 8
Dependent Claim
18 words
The catalyst of claim 6, wherein the molar ratio range of steam to ethylbenzene is 5 to 7.5.
Claim 9
Dependent Claim
77 words
A catalyst for the production of styrene by the catalytic dehydrogenation of ethylbenzene by heating with steam, consisting essentially of: 40 to 87.5% by weight of iron oxide as Fe 2 O 3 , 11 to 50% by weight of cerium oxide as Ce 2 O 3 , 1.5 to 40% by weight of potassium oxide as K 2 O, and up to about 25% by weight of Bi 2 O 3 , CaO or mixture thereof.
Claim 10
Dependent Claim
77 words
A catalyst for the production of styrene by the catalytic dehydrogenation of ethylbenzene by heating with steam, consisting essentially of: 40 to 87.5% by weight of iron oxide as Fe 2 O 3 , 11 to 50% by weight of cerium oxide as Ce 2 O 3 , 1.5 to 40% by weight of potassium oxide as K 2 O, and up to about 25% by weight of Bi 2 O 3 , CaO or mixture thereof.
Claim 11
Dependent Claim
25 words
The catalyst of claim 8, wherein the amount of CaO, Bi 2 O 3 or mixtures thereof in said catalyst ranges from 1-20% by weight.
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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |