Abstract
To establish an effi cient method for effective utilization of lignocelluloses, many studies on lignocellulose conversion technology have been carried out. A promising novel method is treatment with ionic liquids, which are organic salts with melting points in the vicinity of ambient temperature. Ionic liquids have many notable characteristics such as negligible vapor pressure, thermal stability, recyclability, and nonfl ammability. It has been found that some ionic liquids are able to dissolve cellulose, and there have been several reports on applications of ionic liquids to cellulose. Previous work has shown that wood components are decrystallized and depolymerized as they are liquefi ed by treatment with ionic liquids. The differences in the reaction behavior of two different wood species with ionic liquid have been studied. Signifi cant differences in lignin liquefaction behavior were explained by differences in the chemical structure of the lignin in the two wood species. The reaction atmosphere was also found to infl uence the liquefaction of wood. Although many studies on ionic liquid treatment of wood have already been reported, the resulting morphological changes of wood have not been elucidated. For that reason, in the present study, the morphological changes in wood after treatment with the ionic liquid 1-ethyl-3-methylimidazolium chloride were studied by light microscopy.
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