Physicochemical Patterns of the Delignification of Deciduous and Coniferous Wood during Ozonation

Autor: E.M. Benko, D. G. Chukhchin, A. V. Shumyantsev, A. N. Kharlanov, N. A. Mamleeva
Rok vydání: 2021
Předmět:
Zdroj: Russian Journal of Physical Chemistry A. 95:577-585
ISSN: 1531-863X
0036-0244
Popis: Results are presented from a comparative study of the efficiency of ozone use for delignification of deciduous (aspen) and coniferous (pine) wood. The physicochemical properties of lignocellulosic materials (LCMs) obtained by ozonizing wood are investigated via IR spectroscopy and thermal analysis. The content of lignin in LCMs is determined. It is shown that the delignification of wood is accompanied by the destruction of hemicelluloses. The composition of products of ozonation is determined using HPLC. It is found that the destruction of lignin proceeds both via reactions with the participation of molecular ozone (ozonolysis) and free radical processes. The optimum consumption of ozone in wood delignification is ~2 mol O3/mol phenylpropane unit (PPU) of lignin. It is found that the efficiency of delignification is lower for pine than for aspen, due possibly to the difference between the porous structures of deciduous and coniferous wood. It is shown that ozone pretreatment greatly increases the yield of reducing sugars in reactions of the enzymatic hydrolysis of wood substrates. It is concluded that as a raw material, deciduous wood is more promising than coniferous wood when using delignification with ozone in obtaining sugars by enzymatic hydrolysis.
Databáze: OpenAIRE
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