KINETICS OF INTERACTION BETWEEN WATER-SOLUBLE DERIVATIVES OF LIGNIN AND HYDROGEN-PEROXIDE

The kinetics of interaction of hydrogen peroxide (H2O2) with lignosulf onic acid (LSA) and nitrolignin (NL) have been studied as well as with LSA methylated with diazomethane or methyl-sulfate. Changes in the fu nctional composition of LSA and in its infrared spectra as a result of oxidation by hydrogen peroxide were investigated. It was established that hydrogen peroxide consumption proceeds by two radical chain route s and by a non-radical mechanism under interaction with water-soluble mathematical model of kinetics of H2O2 interaction with lignin derivat ives was obtained by an analysis of the kinetic scheme. The model is c onsistent with kinetic results for the oxidation of LSA and nitroligni n by peroxide. Copyright (C) 1996 Published by Elsevier Science Ltd.