JPS6463562A - Method for removing nitrous acid after diazotization - Google Patents
Method for removing nitrous acid after diazotizationInfo
- Publication number
- JPS6463562A JPS6463562A JP21933087A JP21933087A JPS6463562A JP S6463562 A JPS6463562 A JP S6463562A JP 21933087 A JP21933087 A JP 21933087A JP 21933087 A JP21933087 A JP 21933087A JP S6463562 A JPS6463562 A JP S6463562A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- reaction
- heat
- diazotization
- nitrites
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To remove the nitrite salts remaining after diazotization of an aromatic amine, by determining the concentration of the nitrite salts utilizing the reaction heat between the nitrites and the compound reactive therewith, and controlling the amount and the feed rate of the remover to be added to the reaction mixture according to the determined concentration. CONSTITUTION:In the removal of nitrite salts remaining after diazotization of an aromatic amine for production of azo pigments or azo dyes, the heat of reaction between the nitrites and the reactive compound therewith (preferably a remover of nitrites) is utilized to determine the concentration and the amount and feed rate of the remover (preferably sulfamic acid) are controlled according to the determined concentration. An automatic, continuous analyzer is used to collect the sample with a metering pump 1, mix it with air from pump 2, stabilize the temperature with the heat exchanger 5, then allowed to contact with the temperature sensor 6. The sample is mixed with the reagent sent from pump 3 at the point 7 and brought into contact with temperature sensor 8 and the concentration of the nitrite is allowed to correspond to the heat of the reaction which is obtained from the temperature difference between the sensors 6 and 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21933087A JPS6463562A (en) | 1987-09-02 | 1987-09-02 | Method for removing nitrous acid after diazotization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21933087A JPS6463562A (en) | 1987-09-02 | 1987-09-02 | Method for removing nitrous acid after diazotization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6463562A true JPS6463562A (en) | 1989-03-09 |
Family
ID=16733771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21933087A Pending JPS6463562A (en) | 1987-09-02 | 1987-09-02 | Method for removing nitrous acid after diazotization |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6463562A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0653236A1 (en) * | 1993-11-15 | 1995-05-17 | Bayer Ag | Purification of alkyl nitrite containing exhaust gases |
-
1987
- 1987-09-02 JP JP21933087A patent/JPS6463562A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0653236A1 (en) * | 1993-11-15 | 1995-05-17 | Bayer Ag | Purification of alkyl nitrite containing exhaust gases |
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