玉米秸在亚/超临界乙醇-水中液化的初步研究

Experimental study on the liquefaction of corn stalk in suband supercritical ethanol-water

在间歇高压釜实验装置上，采用环境友好的溶剂（乙醇和水）在亚／超临界状态下对玉米秸秆进行液化反应，考察了乙醇摩尔含量对玉米秸秆在超/亚临界乙醇-水中萃取过程的影响，并对液化产物进行了初步分析。研究结果表明，随着乙醇摩尔分数的增加，玉米秸液化的转化率和萃取率呈现先增加后减少的趋势，在乙醇摩尔分数为0．09～0．35范围内，存在一个最优值。在本实验条件下，乙醇摩尔分数为0．21时，玉米秸秆的转化率和萃取率均达到最高值，分别为88．51％，52．52%。利用极性不同的有机溶剂对液化产物进行分离，得到有机水溶物，油溶物和残渣。结果表明，随着乙醇含量的增加，油溶物含量增大，有机水溶物含量减小。

Liquefaction of corn stalk was studied using a high-pressure batch autoclave under the subcritical and supercritical ethanol-water condition. The results indicated that the conversion and extraction of the liquefied products increased at first and then declined with the increasing concentration of ethanol and had a maximum between 0. 09 and 0. 35. Under the experimental conditions used for this study, the maximum conversion yield and extraction yield were 88. 52% and 52. 52%, respectively, at 0. 21 mol fraction of ethanol concentration. Extracted with organic solvent, the product of liquefaction was separated into organic dissolved, oil dissolved and residue. The results showed that the oil dissolved increased and the organic dissolved reduced with the increasing concentration of ethanol.