US3959337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammoxidation process
Assignee: Sun Ventures Inc
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Filing: 1975-04-15
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Granted: 1976-05-25
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Expires: 1995-04-15
Abstract
Abstract An ammoxidation process for preparing nitriles from m- and p-xylene whereby the formation of carbon oxides is held to a minimum which comprises reacting the xylene and ammonia at a temperature of from about 375°C. to about 500°C. and in the presence of added oxygen, the molar ratio of ammonia to xylene being about 3:1 or less, the molar ratio of oxygen to xylene being about 3:1 or less, the volume percent concentration of the feed being preferably about 3% to 10% hydrocarbon, 7% to 20% ammonia, and 10% to 20% oxygen, and the catalyst for said reaction comprising at least about 1 to 10% by weight of a vanadium bronze supported on α-alumina.
Inventors
- 👤 Ronald D. Bushick
- 👤 Howard P. Angstadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:14
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/28; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
107 words
An ammoxidation process for preparing nitriles from m- and p-xylene which comprises reacting said xylene and ammonia at a temperature of from about 375°C. to about 500°C. and in the presence of added oxygen, the molar ratio of ammonia to xylene being no more than about 3:1, the molar ratio of oxygen to xylene being no more than about 3:1, the volume percent concentration of the reactant feed being about 3% to 10% xylene, 7% to 25% ammonia, and 10% to 20% oxygen, and the catalyst for said reaction comprising at least about 1 to 10% by weight of an alkali metal vanadium bronze supported on α-alumina.
Claim 2
Dependent Claim
107 words
An ammoxidation process for preparing nitriles from m- and p-xylene which comprises reacting said xylene and ammonia at a temperature of from about 375°C. to about 500°C. and in the presence of added oxygen, the molar ratio of ammonia to xylene being no more than about 3:1, the molar ratio of oxygen to xylene being no more than about 3:1, the volume percent concentration of the reactant feed being about 3% to 10% xylene, 7% to 25% ammonia, and 10% to 20% oxygen, and the catalyst for said reaction comprising at least about 1 to 10% by weight of an alkali metal vanadium bronze supported on α-alumina.
Claim 3
Dependent Claim
94 words
An ammoxidation process for preparing terephthalonitrile from p-xylene which comprises reacting p-xylene and ammonia at a temperature of from about 400°C. to about 450°C. and in the presence of added oxygen, the molar ratio of oxygen to xylene being from about 2:1 to about 3:1, the volume percent concentration of the reactant feed being about 3% to 10% xylene, 7% to 25% ammonia and 10% to 20% oxygen, and the catalyst for said reaction consisting essentially of at least about 1 to 10% by weight of an alkali metal vanadium bronze supported on α-alumina.
Claim 4
Dependent Claim
94 words
An ammoxidation process for preparing terephthalonitrile from p-xylene which comprises reacting p-xylene and ammonia at a temperature of from about 400°C. to about 450°C. and in the presence of added oxygen, the molar ratio of oxygen to xylene being from about 2:1 to about 3:1, the volume percent concentration of the reactant feed being about 3% to 10% xylene, 7% to 25% ammonia and 10% to 20% oxygen, and the catalyst for said reaction consisting essentially of at least about 1 to 10% by weight of an alkali metal vanadium bronze supported on α-alumina.
Claim 5
Dependent Claim
13 words
The process of claim 2 wherein the catalyst is a sodium vanadium bronze.
Claim 6
Dependent Claim
16 words
The process of claim 3 where the catalyst is predominantly BZ II or the α-prime phase.
Claim 7
Dependent Claim
57 words
The process of claim 2 where the temperature is from about 400°C. to about 435°C., the ratio of oxygen to xylene and of ammonia to xylene is from about 2.0:1 to about 3.0:1, the concentration of feed is about 6% to about 7% xylene, about 10% to about 22% ammonia and about 13% to about 18% oxygen.
Claim 8
Dependent Claim
12 words
The process of claim 5 where the catalyst is predominantly BZ II.
Claim 9
Dependent Claim
13 words
The process of claim 5 where the catalyst is predominantly the α-prime phase.
Claim 10
Dependent Claim
18 words
The process of claim 5 where the catalyst is a mixture of BZ II and the α-prime phase.
Claim 11
Dependent Claim
21 words
The process of claim 1 where the xylene is m-xylene and the reaction temperature is from about 375°C. to about 400°C.
Claim 12
Dependent Claim
18 words
The process of claim 3 where the catalyst pore diameter is from about 0.2 to about 1 micron.
Claim 13
Dependent Claim
15 words
The process of claim 2 where the process is carried out in a fixed bed.
Claim 14
Dependent Claim
15 words
The process of claim 2 where the process is carried out in a fluidized bed.
Claim 15
Dependent Claim
11 words
The process of claim 5 carried out in a fluidized bed.
Claim 16
Dependent Claim
11 words
The process of claim 5 carried out in a fixed bed.
Claim 17
Dependent Claim
17 words
The process of claim 4 carried out at essentially atmospheric pressure and in a fixed bed mode.
Claim 18
Dependent Claim
23 words
The process of claim 4 carried out at a pressure of from about 1 to about 5 atmospheres and in a fluidized bed.
References Cited (Backward Citations)
US3544617A
Cited
US3812171A
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 |