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
Abstract
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.
Actions (login required)
 |
View Item |
![[img]](http://cecri.csircentral.net/style/images/fileicons/application_pdf.png)
