水稻秸秆在亚/超临界乙醇中的液化实验研究

Liquefaction of rice stalk in sub-and supercritical ethanol

在间歇式高压反应釜中采用乙醇为溶剂在亚/超临界状态下对水稻秸秆进行液化实验研究,考察了反应温度、稻秆/乙醇比及停留时间对稻秆液化的影响,确定了反应温度325℃、稻秆与乙醇比为1.0/10.0(g/mL)、反应时间60 min为最佳液化条件。在此条件下,稻秆转化率为78.32%,液化油收率达55.03%;通过GC-MS对液化油进行分析,结果表明,生物油的主要成分是酚类和酯类,占总体的50%左右。液化油的热值为28.95 MJ/kg,运动黏度为5.63 mm2/s,水分含量为2.2%。

Rice stalk（ RS） was liquefied in ethanol under sub-and supercritical conditions in a batch autoclave; the influences of reaction temperature,RS / ethanol ratio and residence time on the liquefaction behavior were investigated. Under the optimized conditions,i. e. 325 ℃,a RS / ethanol ratio of 1 /10（ g / mL）,and a residence time of 60 min,the RS conversion and oil yield reach 78. 32% and 55. 03%,respectively. The GC / MS analysis results illustrate that the dominant components of the bio-oil are phenols and esters,which account for about 50% of the bio-oil product. The bio-oil product obtained exhibits a high heat value（ HHV） of 28. 95 MJ / kg,a kinematic viscosity of 5. 63 mm2/ s,and a water content of 2. 2%.