木质素的解聚和解聚所得生物油的分离是木质纤维素生物质液体燃料技术的瓶颈． 文中研究了木质素液化解聚产物中生物油的盐析萃取分离工艺，探讨了无机盐种类和加入量、平衡时间、温度对生物油盐析萃取效率的影响． 结果表明: 以饱和MnSO₄作为盐析剂有利于生物油的萃取; 在80℃、平衡时间为10min 的条件下，生物油收率达52． 47%，含盐量为2． 76%． 盐析萃取工艺避免了有机溶剂的大量使用，可节约有机溶剂回收所需的成本，同时减少了有机溶剂挥发对环境的污染和潜在的危险，从而实现了生物油分离工艺的绿色化．

The bottleneck in preparing lignocellulosic biomass liquid fuel is how to depolymerize lignin and separate the bio-oil obtained through the depolymerization.In this paper,a new technology of salting-out extraction for separating bio-oil from the liquefaction products of lignin is investigated,and the effects of the kind and dosage of inorganic salt,the equilibrium time and the temperature on the yield of bio-oil from the liquefaction products of lignin are revealed.The results show that the extraction of bio-oil is facilitated by taking saturated MnSO₄ solution as the salting-out agent,and that,under the conditions of 10 min of equilibrium time and 80℃ of extraction temperature,the bio-oil yield is up to 52.47% with a salt content of 2.76%.This new technology avoids the use of organic solvents,and thus saves the cost for the recovery of organic solvents.Meanwhile,it helps eliminate the environmental pollution and the corresponding potential risk,which results from the volatilization of organic solvents.Therefore,this new technology provides a green approach for separating bio-oil from the liquefaction products of lignin.