JPS6463562A - Method for removing nitrous acid after diazotization - Google Patents

Method for removing nitrous acid after diazotization

Info

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
Application number
JP21933087A
Other languages
Japanese (ja)
Inventor
Yoshimi Kikuchi
Sadao Muramatsu
Ataru Chiba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Ink Mfg Co Ltd
Original Assignee
Toyo Ink Mfg Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyo Ink Mfg Co Ltd filed Critical Toyo Ink Mfg Co Ltd
Priority to JP21933087A priority Critical patent/JPS6463562A/en
Publication of JPS6463562A publication Critical patent/JPS6463562A/en
Pending legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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.
JP21933087A 1987-09-02 1987-09-02 Method for removing nitrous acid after diazotization Pending JPS6463562A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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