US3959339A
Expired / Lapsed
US
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Process for producing aromatic nitriles
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1974-06-04
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Granted: 1976-05-25
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Expires: 1994-06-04
Abstract
Abstract Aromatic nitriles are produced in good yield from a gas mixture comprising alkyl-substituted aromatic compound, ammonia and molecular oxygen by ammoxidation by passing the gas mixture over a catalyst comprising vanadium oxide, chromium oxide, boron oxide and phosphorus oxide, deposited on a silica carrier, in an atomic ratio of V : Cr : B : P of 1 : 0.5 - 2.0 : 0.1 - 1.2 : 0.01 - 0.3 and a catalyst concentration of 20 to 80 % by weight at a reaction temperature of 300° to 500°C for a contact time of 0.5 to 30 seconds.
Inventors
- 👤 Masao Saito
- 👤 Mamoru Onozawa
- 👤 Takamasa Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:39
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/28; B; B01; B01J; B01J23/00; B01J23/002; B01J23/16; B01J23/24; B01J23/26; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/199; B01J2523/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A process for producing aromatic nitriles by ammoxidation, which comprises passing a gas mixture comprising alkyl-substituted aromatic compound, ammonia and molecular oxygen over a catalyst comprising vanadium oxide, chromium oxide, boron oxide and phosphorus oxide, deposited on a silica carrier, in an atomic ratio of V : Cr : B : P of 1 : 0.5 - 2.0 : 0.1 - 1.2 : 0.01 - 0.3 and a catalyst concentration of 20 to 80 % by weight at a reaction temperature of 300° to 500°C for a contact time of 0.5 to 30 seconds.
Claim 2
Dependent Claim
94 words
A process for producing aromatic nitriles by ammoxidation, which comprises passing a gas mixture comprising alkyl-substituted aromatic compound, ammonia and molecular oxygen over a catalyst comprising vanadium oxide, chromium oxide, boron oxide and phosphorus oxide, deposited on a silica carrier, in an atomic ratio of V : Cr : B : P of 1 : 0.5 - 2.0 : 0.1 - 1.2 : 0.01 - 0.3 and a catalyst concentration of 20 to 80 % by weight at a reaction temperature of 300° to 500°C for a contact time of 0.5 to 30 seconds.
Claim 3
Dependent Claim
46 words
A process according to claim 1, wherein the catalyst has an atomic ratio of V : Cr : B : P of 1 : 0.7 - 1.5 : 0.3 - 1.0 : 0.01 - 0.2 and a catalyst concentration of 30 to 60 % by weight.
Claim 4
Dependent Claim
31 words
A process according to claim 1, wherein the gas mixture contains 0.5 to 5 % by volume of the aromatic compound when the molecular oxygen is in a form of air.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the gas mixture contains ammonia in volumes 2 to 10 times as much as theoretically required one.
Claim 6
Dependent Claim
25 words
A process according to claim 1, wherein the gas mixture contains molecular oxygen in volumes at least 1.5 times as much as theoretically required one.
Claim 7
Dependent Claim
22 words
A process according to claim 5, wherein the molecular oxygen is contained in volumes 2 to 50 times as much as theoretical.
Claim 8
Dependent Claim
14 words
A process according to claim 1, wherein the reaction temperature is 330° to 470°C.
Claim 9
Dependent Claim
21 words
A process according to claim 1, wherein the alkyl-substituted aromatic compound is toluene, ethylbenzene, xylene, mesitylene, cymene, durene, diethylbenzene or methylnaphthalene.
References Cited (Backward Citations)
US3772212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |