Authors: Masahiko Kobayashi Toshiyuki Asano Mikio Kajiyama Bunichiro Tomita
Publish Date: 2004/10
Volume: 50, Issue: 5, Pages: 407-
Abstract
Liquefactions of cellulose powder steamed lignin alkali lignin and their mixtures were carried out to analyze the reaction process of wood using polyhydric alcohol The liquefaction of wood proceeded immediately and wood components were converted to NNdimethylformamide DMFsoluble components After that the condensation reaction occurred with increasing reaction time However none of cellulose powder steamed lignin and alkali lignin condensed by themselves during their liquefaction The mixture of cellulose and lignin was also liquefied and condensed after a long reaction time The results of analysis showed that the behavior of the mixture resembled that of wood with respect to molecular weight distribution and the main functional groups Lignin was converted to DMFsoluble compounds in the initial stage of wood liquefaction followed by cellulose gradually being converted into soluble compounds After that condensation reactions took place among some parts of depolymerized and degraded compounds from cellulose and lignin and were converted into DMFinsoluble compounds It was concluded that the ratedetermining step of wood liquefaction was the depolymerization of cellulose Furthermore it was suggested that the condensation reaction was due to the mutual reaction among depolymerized cellulose and degraded aromatic derivatives from lignin or due to the nucleophilic displacement reaction of cellulose by phenoxide ion
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