生物质的高压液化与煤液化相比,生物质液化可在较温和的条件下进行。也可以把生物质的直接液化和它的水解工艺结合起来,用水解中生成的木质素残渣作液化原料。木质素的含氧量较低、能量密度较高对液化有利,已有的生物质液化研究许多是以木质素为原料的。生物质的高压液化主要有氢/供氢溶剂/催化剂路线和CO/H2O/碱金属催化剂路线。前者如德国联邦森林和林产品研 High-pressure biomass liquefaction In contrast to coal liquefaction, biomass liquefaction can be carried out under milder conditions. It is also possible to combine the direct liquefaction of biomass with its hydrolysis process, using the lignin residues produced in the hydrolysis as liquefaction feedstock. Low oxygen content of lignin, high energy density of liquefaction benefit, many of the existing biomass liquefaction of lignin as raw material. High pressure liquefaction of biomass is mainly hydrogen / hydrogen donor solvent / catalyst route and CO / H2O / alkali metal catalyst route. The former such as the German federal forest and forest products research