3种不同原料生物油主要化学成分的GC-MS分析

GC-MS analysis of main chemical components for bio-oil from three different biomass materials

以玉米秸、麦秸和棉秆为原料,采用自制固定床热裂解反应器,在400、450、500和550℃等4个温度下进行了热裂解液化实验,获得了3种物料的生物油。反应温度为500℃时,3种生物质热裂解产油率最高。采用气质联用仪测定了500℃热裂解得到的3种原料生物油的化学组分和含量。结果表明,生物质原料种类对生物油的化学成分及含量的影响比较显著。每种原料制取的生物油都存在自己独有的化合物且含量也存在一定的差异,但主要化学族类大体相同。玉米秸热裂解油中酮类物质最多,酸类次之;麦秸和棉秆热裂解油中酸类物质居多,酮类物质次之。

We perform pyrolysis experiments on a fixed bed reactor at 400, 450, 500 and 550 ℃ with corn straw, wheat straw and cotton straw as raw materials. We then obtain three biomass-fast-pyrolysis bio-oils. 500 ℃ is the optimal temperature for obtaining the highest average bio-oil yield. We further employ Gas Chromatograph-Mass Spectrometer- computer （GC-MS）to determine their main chemical components and mass content at 500 ℃. Experimental results show that the kind of biomass materials has significant impact on bio-oil chemical components and contents. Bio-oil from every raw material has its own unique chemical compounds whose contents are also different. However, major components are approximately identical. Ketones are rich in bio-oil from corn stalk, and acids next. While acid is rich in bio-oil from wheat straw and cotton stalk, and ketones next.