Patent US3694518A successfully refreshed from Google Patents.
US3694518A
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Dehydrocoupling process
Assignee: Monsanto Co
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Filing: 1970-12-08
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Granted: 1972-09-26
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Expires: 1990-12-08
Abstract
Abstract A vapor phase process for converting toluene and/or toluene derivatives in the presence of oxygen and a halogen to stilbene and/or stilbene derivatives.
Inventors
- 👤 Raymond A Franz
- 👤 Herbert J Gebhart Jr
- 👤 Phillip D Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:27
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/76; C07C2/82
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
21 words
The method of claim 1 wherein said contacting is conducted for a period of from about 0.1 to about 60 seconds.
Claim 2
Dependent Claim
13 words
The method of claim 1 wherein said halogen is present as elemental iodine.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said halogen is introduced as a volatile halogen compound.
Claim 4
Dependent Claim
13 words
The method of claim 4 wherein said volatile halogen compound is hydrogen iodide.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein said contacting is conducted until at least 25 percent conversion of said phenylmethane is obtained.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein air is used as the source of oxygen.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said halogen is introduced as ammonium iodide.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein the oxygen is introduced into the reaction at spaced intervals of time.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein the oxygen is introduced into the reaction at spaced locations.
Claim 10
Independent Claim
82 words
The method of preparing 1.2-diphenylethylene and derivatives thereof which consists of contacting, in the presence of an inert heat carrier material, in the vapor phase at a temperature in the range of about 500* C. to about 750* C. a phenylmethane and oxygen in a molar ratio of about 0.1 to about 1.0 mol of oxygen per mol of the phenylmethane and at least one halogen in a molar ratio of up to 0.015 mol of halogen per mol of the phenylmethane.
Claim 11
Dependent Claim
13 words
The method of claim 11 wherein said carrier material is an alpha alumina.
Claim 12
Dependent Claim
27 words
The method of claim 12 wherein said alpha alumina has a typical chemical analysis of component percent Al2O3 99.28 SiO2 0.05 Fe2O3 0.15 TiO2 0.02 Na2O 0.50
References Cited (Backward Citations)
US3205280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |