US4091044A
Expired / Lapsed
US
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Dehydrocoupling process
Assignee: Monsanto Co
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Filing: 1976-10-27
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Granted: 1978-05-23
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Expires: 1996-10-27
Abstract
Abstract Toluene and toluene derivatives are oxidatively dehydrocoupled to produce stilbene and stilbene derivatives by heating toluene or a toluene derivative in the vapor phase with a metal- and oxygen-containing composition which functions as an oxidant or oxygen carrier and has the empirical formula SbaPbbBicOd WHEREIN A IS 1, B IS 0.2 - 10, C IS 0 - 5 AND D IS A NUMBER TAKEN TO SATISFY THE AVERAGE VALENCES OF THE Sb, Pb and Bi in the oxidation states in which they exist in said composition. Alternatively, the same metal- and oxygen-containing composition can be employed as a catalyst for the dehydrocoupling reaction when oxygen or an oxygen-containing gas is heated with the hydrocarbon reactant.
Inventors
- 👤 Tao P. Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:15
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/76; C07C2/82; C07C2/84; C07C2523/00; C07C2523/14; C07C2523/16; C07C2523/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A process for producing stilbene from toluene which consists of effecting dehydrocoupling of said toluene by contacting it in the vapor phase at a temperature from about 500° to about 650° C with a metal- and oxygen-containing composition of the formula Sb.sub.a Pb.sub.b Bi.sub.c O.sub.d wherein a is 1, b is 0.2 to 10, c is 0 to 5 and d is a number taken to satisfy the average valences of the Sb, Pb, and Bi in the oxidation states in which they exist in said composition.
Claim 2
Dependent Claim
87 words
A process for producing stilbene from toluene which consists of effecting dehydrocoupling of said toluene by contacting it in the vapor phase at a temperature from about 500° to about 650° C with a metal- and oxygen-containing composition of the formula Sb.sub.a Pb.sub.b Bi.sub.c O.sub.d wherein a is 1, b is 0.2 to 10, c is 0 to 5 and d is a number taken to satisfy the average valences of the Sb, Pb, and Bi in the oxidation states in which they exist in said composition.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein steam is introduced with said toluene in an amount to provide a steam-to-toluene ratio from about 0.5 to 10.
Claim 4
Dependent Claim
60 words
The process of claim 2 wherein said metal- and oxygen-containing composition has the formula Sb.sub.a Pb.sub.b Bi.sub.c O.sub.d wherein a is 1, b is 0.5 to 5, c is 0 to 1 and d is a number taken to satisfy the average valences of the Sb, Pb, and Bi in the oxidation states in which they exist in said composition.
Claim 5
Dependent Claim
22 words
The process of claim 3 wherein said contacting is effected for a period of time from about 0.5 to about 5 seconds.
Claim 6
Dependent Claim
19 words
The process of claim 4 wherein said temperature is in the range from about 540° to about 600° C.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein a reactant selected from the group consisting of oxygen and an oxygen-containing gas is present along with said toluene.
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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |