Krishnamurthy, S. and Udupa, K.S. and Mahadevaiyer, Y. and Venkobarao, H.N. (1986) Electrode monitoring of diazotisation of aromatic amines. Bulletin of Electrochemistry , 2 (5). pp. 519-520. ISSN 0256-1654

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In the diazotisation process for the manufacture of azo dyes, normally starch iodide paper is used for detection of nitrous acid and terminate the process of addition of sodium nitrite at the end point. This is time consuming and leads to subjective errors with regard to the excess nitrous acid present resulting in shade variations from batch to batch of the azopigments produced. A sensitized metal electrode developed for this purpose along with the necessary potentiometric sensing circuit has been found to be quite effective. The results obtained using this electrode showed that control accuracies to 0.6 mM/I of nitrous acid could be achieved. On-off control units for flow control using this sensor have been found to be quite satisfactory for the purpose.

Item Type: Article
Uncontrolled Keywords: Diazotisation; aromatic amine; on-off flow control unit
Subjects: Electroinorganic
Depositing User: ttbdar CECRI
Date Deposited: 21 Mar 2012 05:14
Last Modified: 21 Mar 2012 05:14

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