2010, №1

сс. 52-62

Oxidative delignification of wood in the supercritical carbon dioxide medium.
2. Functionalization of sprucewood lignin

2010, №1

сс. 52-62

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A.D. Ivakhnov, K.G. Bogolitsyn, T.E. Skrebets

Key words: delignification, supercritical fluids, lignin, hydrogen peroxide, oxidation

Transformation of functional groups of lignin in the  course of low-temperature delignification by hydrogen peroxide in the medium of  supercritical (SC) CO2 during the preparation of pulp fiber  semi-product was studied. Molecular-mass characteristics of lignins are  affected by the oxidation. The analyses of functional groups demonstrate that  both oxidation and substitution processes are taking place. Oxidation in SC-CO2 leads to the formation of water- and alkali-soluble  lignin species, while the degree of oxidation of the latter is mild or low due  to a relatively low oxidant consumption.

doi:10.1134/S1990793110070055