Patent US4582647A successfully refreshed from Google Patents.
US4582647A
Expired / Lapsed
US
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Process for the preparation of pure 2,6-dichlorobenzonitrile
Assignee: Evonik Operations GmbH
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Filing: 1985-04-02
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Granted: 1986-04-15
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Expires: 2005-04-02
Abstract
Abstract The present invention provides a process for the preparation of pure 2,6-dichlorobenzonitrile by the ammonoxidation of 2,6-dichlorotoluene in the presence of a catalyst based on vanadium-molybdenum oxide, wherein the reaction is carried out in a fluidized bed process and water is sprayed into the reaction gases after leaving the fluidized bed reactor.
Inventors
- 👤 Herbert Bayerl
- 👤 Walter Pollwein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:19
CPC Classifications
C; C07; C07C; C07C255/00; C07C253/00; C07C253/24; C07C253/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
In a process for the preparation of 2,6-dichlorobenzonitrile by an ammonoxidation reaction of 2,6-dichlorotoluene in a reaction mixture comprising oxygen and ammonia in the presence of a vanadium-molybdenum oxide catalyst to produce a reaction gas, and recovering the 2,6-dichlorobenzonitrile from the reaction gas, the improvement wherein the recovering step comprises spraying water into the reaction gas to cool the reaction gas and precipitate pure 2,6-dichlorobenzonitrile therefrom for recovery, while dissolving impurities.
Claim 2
Dependent Claim
71 words
In a process for the preparation of 2,6-dichlorobenzonitrile by an ammonoxidation reaction of 2,6-dichlorotoluene in a reaction mixture comprising oxygen and ammonia in the presence of a vanadium-molybdenum oxide catalyst to produce a reaction gas, and recovering the 2,6-dichlorobenzonitrile from the reaction gas, the improvement wherein the recovering step comprises spraying water into the reaction gas to cool the reaction gas and precipitate pure 2,6-dichlorobenzonitrile therefrom for recovery, while dissolving impurities.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein sufficient water is sprayed to quench the reaction gases to a temperature of from 20° to 30° C.
Claim 4
Dependent Claim
27 words
The process of claim 1, wherein water is sprayed in an amount of from 10 to 50 liters per 100 ml. of 2,6-dichlorotoluene in the reaction mixture.
Claim 5
Dependent Claim
27 words
The process of claim 3, wherein water is sprayed in an amount of from 20 to 30 liters per 100 ml. of 2,6-dichlorotoluene in the reaction mixture.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the mole ratio of 2,6-dichlorotoluene to ammonia is 1:2 to 5.
Claim 7
Dependent Claim
17 words
The process of claim 5, wherein the mole ratio of 2,6-dichlorotoluene to ammonia is 1:2.5 to 4.
Claim 8
Dependent Claim
17 words
The process of claim 5, wherein the mole ratio of 2,6-dichlorotoluene to oxygen is 1:3 to 5.
Claim 9
Dependent Claim
15 words
The process of claim 7 wherein the reaction temperature is from 400° to 500° C.
Claim 10
Dependent Claim
21 words
The process of claim 8 wherein the contact time of the 2,6-dichlorotoluene with the catalyst is from 0.5 to 1 second.
Claim 11
Dependent Claim
8 words
The process of claim 1 carried out continuously.
Claim 12
Dependent Claim
29 words
The process of claim 1 wherein the reaction is carried out in a fluidized bed, and the water is sprayed into the reaction gas as it leaves the bed.
Claim 13
Dependent Claim
69 words
The reaction of claim 11 wherein reaction temperature is from 400° to 500° C; the contact time with the catalyst in the bed is from 0.5 to 1 second; the mole ratio of 2,6-dichlorotoluene to ammonia to oxygen is 1:2 to 5:3 to 5, and water is sprayed into the reaction gases in an amount of 10 to 50 liters per 100 ml of 2,6-dichlorotoluene in the reaction mixture.
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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |