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选用水和有机溶剂对桉木-离子液体体系中溶解的生物质组分进行分离,通过对析出物的成分及结构表征分析可知:水分离体系中含水量小于10%时主要析出物为纤维素,含水量在11%-15%阶段析出物是混合物,含水量大于16%时主要析出物为木质素;在丙酮-水比例50%(V/V)的有机溶剂体系中木质素的得率明显低于纤维素。水分离法得到的纤维素和木素纯度高于有机溶剂分离法,X-RD分析结果表明再生的纤维素,晶型结构发生了明显的变化,但FT-IR分析结果表明,再生纤维素的特征吸收峰并未发生明显的改变,仍保有着与微晶纤维素相似的化学性质。
Water and organic solvents were used to separate the dissolved biomass components in eucalyptus-ionic liquid system. The composition and structure of the precipitates were analyzed. The results showed that when the water content was less than 10%, the main precipitates were cellulose , The precipitate with 11% -15% water content is a mixture, and the main precipitate is lignin when the water content is more than 16%. The yield of lignin in the organic solvent system with acetone-water proportion of 50% (V / V) Significantly lower than cellulose. The purity of cellulose and lignin obtained by water separation was higher than that of organic solvent. The results of X-RD analysis showed that the crystalline structure of regenerated cellulose changed obviously. However, FT-IR analysis showed that the cellulose The characteristic absorption peak did not change significantly, still retains the similar chemical properties with microcrystalline cellulose.