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Liquefaction of wood by using phenol or polyhydric alcohols.

Zhang Qiuhui; Zhao Guangjie. School of Material Science and Technology, Beijing For. Univ., 100083, P. R. China.  
To improve the new technique of effective utilization of wood resources, several methods of wood liquefaction, such as high_temperature and high_pressure method, dissolution method, acid_catalyzed method and non_catalysis method, are systematically described in this review. In these methods, the first one is the most primitive, and the last one taking sulfuric acid, hydrochloric acid, phosphoric acid or oxalic acid etc. as catalyst is the most promising and applicable method. Furthermore, this paper systematically and deeply discussed wood liquefaction in the presence of phenol or polyhydric alcohols. Moreover, some reaction behaviors and pathways of the major components of wood, and the utilization of liquefied wood are discussed. At the last, the author indicates that:first, the mechanism of wood liquefaction needs to be further explored; second, the new environment_friendly liquefaction solution and \!green\" nontoxic liquefaction method should been developed; meanwhile, the compounding of liquefied wood and other materials should be studied to obtain new composites with prominent properties such as liquefied_wood/montmorillonite intercalative nanocomposites.
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