Delignification of softwood by ozonation

Mamleeva, Nadezhda A.; Autlov, Stanislav A.; Bazarnova, Natal’ya G.; Lunin, Valery V.

doi:10.1351/PAC-CON-08-10-11

Pure Appl. Chem., 2009, Vol. 81, No. 11, pp. 2081-2091

http://dx.doi.org/10.1351/PAC-CON-08-10-11

Published online 2009-10-30

Delignification of softwood by ozonation

Nadezhda A. Mamleeva¹*, Stanislav A. Autlov², Natal’ya G. Bazarnova² and Valery V. Lunin¹

¹ Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1, Building 3, Moscow 119992, Russia
² Chemistry Department, Altai State University, Lenin prosp., 61, Barnaul 656049, Russia

Abstract: Ozonation of aspen sawdust of various moisture content (MC) values was investigated. Ozone consumption corresponding to the completion of the ozonation process was shown to be governed by the wood MC. Cellulose-containing material of a low (1–3 %) residual lignin content (LC) was produced under ozonation. It is proposed that ozone dissolved in water is responsible for delignification. The conversion of lignin during softwood ozonation was investigated by UV and Fourier transform-infrared (FT-IR) spectroscopy. The pathways of lignin transformations are influenced by wood MC value.