US3868427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrocoupling process
Assignee: Monsanto Co
•
Filing: 1973-10-19
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Granted: 1975-02-25
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Expires: 1993-10-19
Abstract
Abstract A vapor phase for converting toluene and/or toluene derivatives in the presence of oxygen, an inert heat carrier material, a metal oxide and a halogen to stilbene and/or stilbene derivatives.
Inventors
- 👤 Raymond A Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:09
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/76; C07C2/82; C07C2/84; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/44
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
THE METHOD OF PREPARING 1,2-DIPHENYLETHYLENE AND DERIVATIVES THEREOF WHICH COMPRISES CONTACTING 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 IN THE PRESENCE OF ALPHA ALUMINA COATED WITH 1 TO 25 MONOLAYERS OF A PALLADIUM OXIDE.
Claim 2
Independent Claim
87 words
THE METHOD OF PREPARING 1,2-DIPHENYLETHYLENE AND DERIVATIVES THEREOF WHICH COMPRISES CONTACTING 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 IN THE PRESENCE OF ALPHA ALUMINA COATED WITH 1 TO 25 MONOLAYERS OF A PALLADIUM OXIDE.
Claim 3
Dependent 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 4
Dependent Claim
13 words
The method of claim 1 wherein said halogen is present as elemental iodine.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said halogen is introduced as a volatile halogen compound.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein said volatile halogen compound is hydrogen iodide.
Claim 7
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 8
Dependent Claim
14 words
The method of claim 1 wherein air is used as the source of oxygen.
Claim 9
Dependent Claim
13 words
The method of claim 1 wherein said halogen is introduced as ammonium iodide.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein the oxygen is introduced into the reaction at spaced intervals of time.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein the oxygen is introduced into the reaction at spaced locations.
Claim 12
Dependent Claim
19 words
The method of claim 1 wherein said palladium oxide is present in a quantity of 5 to 10 monolayers.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |