Abstract
Experiments and calculations are used to determine the optimum parameters of the peroxide delignification of larch wood in the presence of MnSO4 catalyst that provides high yields of cellulose (44.3 wt %) with low residual lignin contents at a temperature of 100°C, an H2O2 content of 6 wt %, a CH3COOH content of 25 wt %, a LWR of 15, and a duration of 3 h The cellulose obtained under optimum conditions has a chemical composition of cellulose, 92.7 wt %; lignin, 0.6 wt %; and hemicellulose, 5.7 wt %. IRS and X-ray diffraction are used to determine that cellulose obtained from larch wood has a structure similar to that of industrial microcrystalline cellulose. The proposed catalytic approach allows cellulose to be obtained from larch wood with a minimal lignin content under mild conditions in one step and with a high yield, a degree of crystallinity of 0.8, and a crystallite size of 3.0 nm.
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ACKNOWLEDGMENTS
The equipment of Krasnoyarsk Regional Research Equipment Centre of SB RAS was used in present work.
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This work was supported by the Russian Science Foundation, project no. 16-13-10326.
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Sudakova, I.G., Garyntseva, N.V., Chudina, A.I. et al. Experimental and Mathematical Optimization of the Peroxide Delignification of Larch Wood in the Presence of MnSO4 Catalyst. Catal. Ind. 12, 265–272 (2020). https://doi.org/10.1134/S2070050420030125
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DOI: https://doi.org/10.1134/S2070050420030125