碳酸乙烯酯/聚乙二醇对玉米秸秆液化特性影响的研究

Study on Cornstalk Liquefaction in the Mixed Solvents of EC and PEG400

摘要: 本实验以碳酸乙烯酯(EC)与聚乙二醇(PEG400)的共混物为液化剂，浓硫酸为催化剂，在反应温度160℃，反应时间90 min下，研究了EC与PEG400的质量比对液化产物的残渣含量、酸值、羟值的影响。实验结果表明：随着混合液化剂中EC含量的降低，液化产物残渣含量和羟值逐渐升高，酸值先降低后增加，在EC/PEG400 = 4:6 w:w时达到最低值7.23 mgKOH/g，在EC与PEG400共混体系中，液化剂可能是分阶段发生作用的，首先是EC发生作用，而后是PEG400，临界点为EC/PEG400 = 4:6 w/w。

Abstract: Liquefaction of cornstalk was conducted in the mixed solvents of EC and PEG400, using sulfuric acid as catalyst at 160˚C for 90 min. The liquefied product from different ratios of EC to PEG400 was analyzed. The results indicated that with the mass ratio of EC and PEG400 decreasing, the residue con-tent and hydroxyl value of the liquefied product increased gradually but the acid value decreased before increasing and reached its lowest value 7.23 mgKOH/g at a mass ratio of 4:6. This could suggest that in the EC and PEG400 blending system, the liquefying solvent may react with corn stalk by stages. EC had priority to react with corn stalk. The critical point was the mass ratio of EC and PEG equaling to 4:6.