Kinetics of thermal decomposition of dianilinium sulphate

Abstract

The thermal decomposition of arylammonium sulphate (dianilinium sulphate) has been investigated; sulphanilic acid is found to be the decomposition product. The mean value for the energy of activation (28.27 ± 0.46 kcal mol^–1) for the decomposition has been determined from isothermal TGA data [fitted in the Avrami–Erofeev (n= 2, 3)], contracting area, contracting cube, and Jacobs–Kureishy equations. Thus, the decompositon of dianilinium sulphate seems to be controlled by a random nucleation process. The results suggest that the primary step (prior to sulphonation) in the decomposition of this salt is a proton-transfer process.