US3870743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aromatic dinitriles
Assignee: Veba Oel AG
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Filing: 1970-06-17
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Granted: 1975-03-11
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Expires: 1990-06-17
Abstract
Abstract In the production of nitriles of aromatic dicarboxylic acids by the reaction of alkyl-substituted benzenes with oxygen and ammonia at elevated temperatures, the improvement which comprises employing as catalyst a mixture of vanadium and molybdenum oxides on an alumina carrier, which has been activated by a compound of at least one of cerium, chromium, manganese, tungsten, bismuth, tin, antimony, titanium, lithium, sodium and potassium.
Inventors
- 👤 Guenther Ibing
- 👤 Kurt Neubold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:29
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
IN THE PRODUCTION OF NITRILES OF AROMATIC DICARBOXYLIC ACIDS BY THE REACTION OF DIALKYL-SUBSTITUTED BENZENES WITH OXYGEN AND AMMONIA AT ELEVATED TEMPERATURE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS CATALYST A MIXTURE OF VANADIUM AND MOLYBDENUM OXIDES ON ALUMINA AS CARRIER, WHICH HAS BEEN ACTIVATED BY ABOUT 0.1 TO 50% OF THE COMBINED WEIGHTS OF MOLYBDENUM AND VANADIUM OXIDE OF AT LEAST ONE OF CERIUM, CHROMIUM, MANGANESE, TUNGSTEN, BISMUTH, TIN, ANTIMONY, TITANIUM, LITHIUM, SODIUM AND POTASSIUM OXIDES, THE MOLE RATIO OF VANADIUM OXIDE TO MOLYBDENUM OXIDE RANGING FROM ABOUT 0.5-2:1.
Claim 2
Dependent Claim
89 words
IN THE PRODUCTION OF NITRILES OF AROMATIC DICARBOXYLIC ACIDS BY THE REACTION OF DIALKYL-SUBSTITUTED BENZENES WITH OXYGEN AND AMMONIA AT ELEVATED TEMPERATURE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS CATALYST A MIXTURE OF VANADIUM AND MOLYBDENUM OXIDES ON ALUMINA AS CARRIER, WHICH HAS BEEN ACTIVATED BY ABOUT 0.1 TO 50% OF THE COMBINED WEIGHTS OF MOLYBDENUM AND VANADIUM OXIDE OF AT LEAST ONE OF CERIUM, CHROMIUM, MANGANESE, TUNGSTEN, BISMUTH, TIN, ANTIMONY, TITANIUM, LITHIUM, SODIUM AND POTASSIUM OXIDES, THE MOLE RATIO OF VANADIUM OXIDE TO MOLYBDENUM OXIDE RANGING FROM ABOUT 0.5-2:1.
Claim 3
Dependent Claim
89 words
In the production of nitriles of aromatic dicarboxylic acids by the reaction of dialkyl-substituted benzenes with oxygen and ammonia at elevated temperature, the improvement which comprises employing as catalyst a mixture of vanadium and molybdenum oxides on alumina as carrier, which has been activated by about 0.1 to 50% of the combined weights of molybdenum and vanadium oxide of at least one of cerium, chromium, manganese, tungsten, bismuth, tin, antimony, titanium, lithium, sodium and potassium oxides, the mole ratio of vanadium oxide to molybdenum oxide ranging from about 0.5-2:1.
Claim 4
Dependent Claim
89 words
In the production of nitriles of aromatic dicarboxylic acids by the reaction of dialkyl-substituted benzenes with oxygen and ammonia at elevated temperature, the improvement which comprises employing as catalyst a mixture of vanadium and molybdenum oxides on alumina as carrier, which has been activated by about 0.1 to 50% of the combined weights of molybdenum and vanadium oxide of at least one of cerium, chromium, manganese, tungsten, bismuth, tin, antimony, titanium, lithium, sodium and potassium oxides, the mole ratio of vanadium oxide to molybdenum oxide ranging from about 0.5-2:1.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the alumina comprises gamma -alumina having a surface of about 50 to 150 square meters per gram.
Claim 6
Dependent Claim
26 words
A process according to claim 1, wherein the rate of throughput ranges from about 10 to 300 grams of alkylbenzenes per hour per liter of catalyst.
Claim 7
Dependent Claim
29 words
A process according to claim 1, wherein per mole of alkylbenzene there are provided about 4 to 14 moles of ammonia and about 5 to 240 moles of oxygen.
Claim 8
Dependent Claim
21 words
A process according to claim 1, wherein the contact time between catalyst and reactants ranges from about 0.1 to 4 seconds.
Claim 9
Dependent Claim
30 words
A process according to claim 1, including the further step of subjecting the crude product to washing with water, and then to washing with a lower alkyl alcohol or ketone.
Claim 10
Dependent Claim
115 words
A process according to claim 6, wherein the alkylbenzene is xylene, the vanadium oxide and molybdenum oxide are provided in approximately equimolar amounts, the alumina comprises about 90 to 96% by weight of the catalyst and comprises gamma -alumina having a surface of about 50 to 150 square meters per gram, the rate of throughput ranges from about 140 to 200 grams of alkylbenzenes per hour per liter of catalyst, the temperature ranges from about 400* to 500*C., there are provided about 8 to 12 moles of ammonia and about 10 to 50 moles of oxygen per mole of alkylbenzene, and the contact time between catalyst and reactants ranges from about 0.5 to 1.5 seconds.
Claim 11
Dependent Claim
12 words
A process according to claim 1, wherein the activator comprises cerium oxide.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |