Kinetic studies and optimization of abies wood fractionation by hydrogen peroxide under mild conditions with TiO2 catalyst

The kinetic study of abies wood delignification by H2O2 in the medium acetic acid-water was first carried out in the presence of TiO2 catalyst under mild conditions: temperatures 70-100 degrees C, atmospheric pressure. The oxidative delignification process is described satisfactory by the first order equation in all temperature range. The rate constants varied between 0.80 and 12.3 9 10(-3) min(-1) and the activation energy was near 81 +/- 0.21 kJ mol(-1). The optimal parameters of the delignification process, providing the effective fractionation of abies wood on microcrystalline cellulose and soluble lignin, were established by experimental and numerical methods.