Kinetic study of aspen-wood sawdust delignification by H2O2 with sulfuric acid catalyst under mild conditions

B. N. Kuznetsov , I. G. Sudakova , N. V. Garyntseva , L. Djakovitch (1) , C. Pinel (1)

1 BIOVERT - BIOVERT

The process of aspen-wood delignification in the medium "hydrogen peroxide-acetic acid-water-sulfuric acid catalysts" at mild conditions (temperature 70-100 A degrees C, atmospheric pressure) is described by the first order equation. Rate constants vary from 0.25 x 10(-4) (70 A degrees C) to 2.5 x 10(-4) s(-1) (100 A degrees C). The activation energy of aspen-wood delignification is near 91 kJ mol(-1). The rather high value of activation energy points to the insignificant role of diffusion limitations at used conditions of aspen-wood delignification. The optimal process conditions for obtaining of the pure cellulose (residual lignin content less 1 wt%) with a yield near 45 wt% were selected. Obtained cellulose has the structure similar to the commercial microcrystalline cellulose.

Domaines: Catalyse; Environnement et Société

B. N. Kuznetsov, I. G. Sudakova, N. V. Garyntseva, L. Djakovitch, C. Pinel. Kinetic study of aspen-wood sawdust delignification by H2O2 with sulfuric acid catalyst under mild conditions. Reaction kinetics, mechanisms and catalysis, 2013, 110, pp.271-280. ⟨10.1007/s11144-013-0601-2⟩. ⟨hal-00924007⟩