A cost-effective process has been developed for fractionating pine sawdust into lignin and cellulose fractions in an ethanol-water mixed solvent. The effects of temperature, different types of catalysts (i.e., strong acid, weak acid and alkali), and residence time, with respect to yields and purity of the crude lignin (degraded products) and crude cellulose (solid residue) were investigated. It is found that the purity of crude lignin was higher but with a lower product yield under a weak acid or alkali catalysis in comparison to strong acid treatments. According to the analysis results, the optimal conditions for fractionation process were as follows: a mixed solvent of ethanol-water (1:1, v/v), 15 % formic acid (based on dry biomass), 180 °C, and 60 min. The yield of the resulted crude lignin was 29.2 % with a purity of 54.6 %, and yield of crude cellulose was 64.6 % with a high purity of 84.3 %.

已经开发出了一种经济有效的方法，可以将松木屑在乙醇-水混合溶剂中分馏为木质素和纤维素馏分。研究了温度，不同类型的催化剂（即强酸，弱酸和碱）和停留时间对粗木质素（降解产物）和粗纤维素（固体残余物）的产率和纯度的影响。发现与强酸处理相比，在弱酸或碱催化下，粗木质素的纯度较高，但产物收率较低。根据分析结果，分馏过程的最佳条件如下：乙醇-水（1：1，v / v），15％甲酸（基于干生物质）的混合溶剂，180°C和60分钟 所得粗木质素的产率为29.2％，纯度为54.6％，