Under the optimal high temperature liquid water （HTLW） pretreatment conditions （180 ℃, 40 min, solid-liquid ratio of 5%, the saturation vapor pressure）, the performance of three different energy grasses are compared. The xylose yields of hybrid Pennisetum Ⅰ, Ⅱ and switchgrass were 88.46%, 98.09%, 83.65% respectively. The enzymatic hydrolysis rates of the three energy grasses were increased after high temperature liquid water hydrolysis, the maximum enzymolysis rate was close to 100%, total sugar yield was about 90%, so to some extent high temperature liquid water pretreatment can be seen to increase the sugar recovery. In addition, there are also differences in the subsequent hydrolysis performance of the three grasses. The enzymatic hydrolysis rate of switchgrass was increased by about 50% before and after pretreatment, while Pennisetum Ⅱ, Ⅰ was increased about 40% and 20%, respectively. Through composition analysis, the increase of enzymatic hydrolysis rate may be caused by the degradation of lignin and hemicellulose and the exposure of cellulosewhich leads to easier contact between cellulase and substrate. The difference of lignin removal degree resulted in different increase of enzymatic hydrolysis rate of the three raw materials
Key words
biomass /
enzymatic hydrolysis /
bioethanol /
energy grasses /
high temperature liquid water （HTLW）
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