ПРЕВРАЩЕНИЯ ПОЛИСАХАРИДОВ И ЛИГНИНА В ДРЕВЕСИНЕ ПРИ ОЗОНИРОВАНИИ

Abstract

Ozonation is a method of vegetable raw substrates pretreatment in relation to cellulose as well as monosaccharides processing. It was investigated the process of ozone consumption by wood of various water content. The data on lignin and polysaccharides transformations in aspen wood ozonation are presented in the paper. It was considered a gradual transformation of the substrate: wood – ozonated wood – cellulose-containing product – holocellulose – cellulose. Yields of ozonated wood, cellulose-containing product, water soluble ozonaton products, holocellulose, and cellulose were determined. The lignin content in the cellulose-containing product was determined. Both holocellulose and cellulose samples were studied by IR spectroscopy method. The degree of polymerization, and molecular mass distribution of cellulose obtained from ozonated wood were determined. It is shown that destruction of wood by ozone impact is accompanied by lignin, hemicelluloses, and cellulose degradation. It is found that physicochemical p roperties of cellulose obtained from ozonated wood can be regulated by the variation of the initial water content of the substrate. Wood destruction is due to reactions of molecular ozone as well as radical species which have been generated by ozone reactions with water presenting in the substrate structure.