US4448894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst and reverse disproportionation process
Assignee: Monsanto Co
•
Filing: 1983-07-18
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Granted: 1984-05-15
•
Expires: 2003-07-18
Abstract
Abstract A catalyst containing tungsten, antimony and an alkali or alkaline earth component on a support, preferably silica gel, is disclosed which is useful in reverse disproportionation of stilbene and ethylene to produce styrene.
Inventors
- 👤 Charles F. Hobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:41
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/30; C; C07; C07C; C07C6/00; C07C6/02; C07C6/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
A catalyst comprising catalytically-effective amounts of antimony, tungsten and an alkali or alkaline earth component on a carrier material.
Claim 2
Dependent Claim
19 words
A catalyst comprising catalytically-effective amounts of antimony, tungsten and an alkali or alkaline earth component on a carrier material.
Claim 3
Dependent Claim
11 words
Catalyst of claim 1 wherein the carrier material is silica gel.
Claim 4
Dependent Claim
13 words
Catalyst of claim 1 wherein the alkali or alkaline earth component is potassium.
Claim 5
Dependent Claim
38 words
Catalyst of claim 1 wherein the catalyst contains 0.1 to 10 wt % W, 0.01 to 2 wt % alkali or alkaline earth component and 0.03 to 4 wt % Sb, and the carrier material is silica gel.
Claim 6
Dependent Claim
48 words
Catalyst of claim 1 wherein the catalyst contains 1 to 6 wt % W as WO 3 , 0.1 to 1.5 wt % Sb as Sb 2 O 3 , and 0.03 to 0.2 wt % K as K 2 O, and the carrier material is silica gel.
Claim 7
Dependent Claim
13 words
Catalyst of claim 1 wherein the Sb:W atomic ratio is 1:20 to 2:1.
Claim 8
Dependent Claim
11 words
Catalyst of claim 1 wherein the Sb:W atomic ratio is 1:5.
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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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |