Abstract
A catalyst for oxygen-acetone delignification has been suggested. The research has been carried out on spruce sawdust. Use of the catalyst in wood oxidation by oxygen in 60 % acetone allows transfer to the solution of about 90 % lignin during the reaction time of 2-4 hours at the reaction temperature of 120°C. Kinetics of delignification and influence of the catalyst concentration (0.2-2.0 g/l, liquid-to-wood ratio 25, P°(O2) 0.7 MPa) on dissolution of wood components have been investigated. The rate of delignification in the catalytic process (120°C) is an order of magnitude higher than the rate of lignin dissolution in the process carried out in the absence of the catalyst.
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