Siberian Federal University

A new extraction-catalytic method for the production of microcrystalline cellulose (MCC) and nanofibrillated cellulose (NFC) has been proposed. The method integrates the next stages: isolation the cellulose product and ethanol lignin by treating wood with 60 % ethanol at 190 °C, obtaining MCC by treating the cellulose product with hydrogen peroxide in acetic acid- water medium at 100 °C in the presence of catalyst H2MoO4, obtaining NFC by sulfuric acid and ultrasonic treatments of MCC. Under optimal conditions of catalytic peroxide treatment of the cellulose product, MCC was obtained with an yield of 41.3 % of the wood mass, which contains 91.2 wt.% cellulose, 0.8 wt.% lignin and has a degree of polymerization of 340. NFC, obtained from MCC with an yield of 29.7 % by weight of wood, has a supramolecular structure of cellulose II, a crystallinity index of 0.67, a degree of polymerization of 117 and an average hydrodynamic diameter of particles of 24.9 nm. Ethanol lignin formed during the isolation of the cellulose product from abies wood has a high concentration of oxygen- containing functional groups, a specific surface area of 48 m2/g, an average pore size of 11.2 nm and it has a high sorption activity for J2 (40.6 %) and methylene blue (70.1 mg/g)