为了研究杉木碱木质素在溶剂/水混合体系中的解聚特性，选取乙醇/水、乙酸乙 酯/水、乙二醇/水以及纯水 4 种体系进行实验． 从液相产物得率和总酚得率来看，以乙醇/ 水混合体系作为介质时杉木碱木质素的解聚效果最好，最优工艺条件为: 温度 300 ℃、反 应时间 30 min、转速 500 r/min，甲酸镍用量 10% ，乙醇/水体积比 40 ∶ 60，在该条件下，液相 产物得率达 73． 88% ，总酚得率达 14． 45% ． 液相产物经 200 ℃ 一级闪蒸后，在 500 ℃ 下热 裂解，形成的源于木质素基本结构单元的单酚等化合物的种类最多，这样可以大大提高混 合单酚的产量，尤其是富含寡聚物的蒸馏残余物经二次热解可部分断开甲基芳基醚键，形 成一定量的邻苯二酚，这为液相产物的提质和利用指出了新的方向．

In order to investigate the depolymerization characteristics of alkali lignin in solvent /water mixture systems，four systems，namely ethanol /water，ethyl acetate /water，ethylene glycol /water and pure water，were selected to perform experiments． The results show that ( 1) ethanol /water mixed solvent medium helps to obtain the highest yield of liquid products and total phenolic compounds; ( 2) under the optimal reaction condition ( a temperature of 300 ℃，a reaction time of 30 min，a rotational speed of 500 r/min，a formic acid dosage of nickel of 10% and an ethanol-to-water volume ratio of 40∶60) ，the yields of liquid products and total phenolic compounds are 73. 88% and 14. 45% ，respectively; and ( 3) after the flashing at 200 ℃ and the pyrolysis at 500 ℃ of the liquid products，the phenolic compounds derived from lignin's basic structural unit are the most abundant，thus greatly increasing the yield of monophenol． Moreover，the methyl aryl ether bond of the distillation residue may break down during the pyrolysis process，which leads to the formation of a certain amount of catechol． All these above-mentioned statements provide guidelines for the quality improvement and utilization of liquid products．