Abstract
The process of aspen-wood delignification in the medium “hydrogen peroxide–acetic acid–water–sulfuric acid catalysts” at mild conditions (temperature 70–100 °C, atmospheric pressure) is described by the first order equation. Rate constants vary from 0.25 × 10−4 (70 °C) to 2.5 × 10−4 s−1 (100 °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.
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Acknowledgments
The reported study was partially supported by RFBR, research project No 12-03-93117 and by programme of Prezidium RAS (project 3.8). This work is part of GDRI “Catalytic valorization of biomass”.
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Kuznetsov, B.N., Sudakova, I.G., Garyntseva, N.V. et al. Kinetic study of aspen-wood sawdust delignification by H2O2 with sulfuric acid catalyst under mild conditions. Reac Kinet Mech Cat 110, 271–280 (2013). https://doi.org/10.1007/s11144-013-0601-2
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DOI: https://doi.org/10.1007/s11144-013-0601-2