亚/超临界乙醇条件下杨木屑与甘油共液化研究

以60～80目的杨木屑为原料,甘油为液化剂,酸为催化剂,基于超临界乙醇条件下对杨木屑进行液化制备生物重油。实验结果表明:以2.5%硫酸为催化剂,在甘油/乙醇/木屑质量比为5∶10∶2条件下,250℃反应1 h,木屑的转化率可达98%。此液化油含水量为3.04%(wt),运动黏度为524 mm2/s,酸值为2.1 mg KOH/g,羟值为846 mg KOH/g。对液化油进行IR、GPC和GC-MS分析的结果显示,液化油含有大量的羟基物质,平均相对分子质量为811,并且含有4-羰基戊酸丁酯、三乙基甘油醚等聚酯/聚醚类多元醇。

Liquefaction of Poplar Sawdust by Supercritical Ethanol and Glycerin

Using sawdust （60-80 mesh） as raw material, glycerin as liquid agent, and acid as catalyst, Liquefied oil was made in the condition of supercritical ethanol. The result demonstrates that the degree of liquefaction was up to 98% under the reaction conditions of 2.5% sulfuric acid, glycerin/ethanol/sawdustas 5/10/2, and reaction temperature 250℃ for 1 h. Liquefied oil were measured that the water content was 3.04%, viscosity （20℃） was 524 mm^2/s, acid value was 2.1 mg KOH/g, the hydroxyl value was 846 mg KOH/g, and it was analyzed by IR. GPC and GC-MS. The results show that the product is rich in hydroxyl groups, Average molecular weight was 811, and polyester/polyether polyols were detected in the product like ethyl pentanoate, -4-oxo- and glycerin, -triethyl-, etc.