超/亚临界水条件下生物质和塑料的共液化

Co-liquefaction of Biomass with Plastic in Sub-and Supercritical Water

采用500mL间歇式高压反应釜,在超临界和亚临界水条件下进行了一系列生物质和塑料单独及共液化实验,考察了反应温度、反应时间、水与木屑-聚乙烯的配比和反应压力对两者共液化的影响。实验结果表明,温度对共液化影响比较大。在653K,混合物的组成是对液化物产率影响最大的因素,生物质与塑料质量比为1:4时油产率最高,可达到60%。生物质能降低塑料的降解温度,塑料为生物质供氢,两者在共液化过程中具有协同作用。生物质和塑料共液化能够提高反应转化率,提高油产率,减缓反应条件的苛刻度。

Co-liquefaction of biomass （sawdust and rice straw） with plastic （high density polyethylene, HDPE） in sub- and supercritical water（ SCW）was investigated using a 500 mL stainless-steel autoclave. A series of liquefaction experiments were carried out with biomass and plastic individually and in combination. To obtain basic knowledge about degradation of biomass and plastic into oil, the effects of reaction temperature, reaction time, ratio of water to biomass and polyethylene （PE） and degradation pressure were investigated. At 653 K the maximum yield of oil was achieved. At this temperature, the most important parameter for oil yield was biomass/plastie ratio in the feedstock. Yield of oil up to 60 % was obtained using 1 ： 4 weight ratio of biomass/PE mixture. Co-liquefaction of biomass with plastic increased the yield of oils. Results showed that addition of biomass to plastic could decrease the degradation temperature of plastic to supply hydrogen, and the synergistic effects of biomass and plastic, could enhance oil yield and ease the requirement of reaction condition.