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KINETIC INVESTIGATION OF DIAZOTIZATION REACTION IN BENZOTRIAZOLE WITH DEAD-STOP-END-POINT METHOD

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Author(s): Flora Shayegh | Fatemeh Hair | Seyed Mehdi Kamali Shahri

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 51;
Issue: 1;
Start page: 13;
Date: 2009;
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Keywords: benzotriazole | orthophenylenediamine | diazotization | kinetic | rate equation | electrochemistry.

ABSTRACT
Benzotriazole is an organic compound with many industrial applications such as being a maincorrosion-inhibiting component of cupric metal. Kinetic investigation of diazotization reaction, whichhas been performed for the first time in this work, is a key reagent for the industrial scaleproduction of this compound. Benzotriazole is produced through the diazotization oforthophenylenediamine (OPDA) in an aqueous media containing acetic acid and sodium nitrate.Conventional procedures used for the kinetic investigation of the diazotization reactions includebiamperometry, amperometry, polarography, spectroscopy in UV area and colorimetry, whichcannot be used in the case of the present invention and hence a new a new electrochemicalmethod called the Dead-Stop-End-Point method was devised. New rate equations based onpostulated mechanisms were tested using the experimental data under different temperature, pHand concentration values. The results indicated that the rate equation are first order with respect toorthophenylenediamine and nitroze acid and that the rate constant is a function of the temperatureand acetic acid concentration.
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