甲烷磺酸催化液化杨木研究

Study on Liquefaction of Poplar Wood Catalyzed by Methanesulfonic Acid

研究了苯甲基化预处理对木材的甲烷磺酸催化液化产物特征的影响。当甲烷磺酸用量为20%(以木粉质量计,下同)时,原木粉与苯甲基化木粉的液化率均达到最高值约为97%,当甲烷磺酸用量超过20%时,液化率均呈下降趋势,但经苯甲基化改性木粉的液化率下降趋势较慢。经过苯甲基化预处理,增加了液化产物中的苯环结构,并且有效缓解催化剂过量时液化产物的重新聚合,同时明显降低了液化产物的平均分子质量,使液化过程更加彻底,对木材液化产物的进一步改性利用具有重要意义。

The influences of benzylation pretreatment on the properties of products from poplar wood liquefaction catalyzed by methanesulfonie acid were studied. It was found that at the methanesulfonic acid dosage of 20 % （ of wood meal）, the liquefac- tion yields of both original and benzylated wood meals were 97 %. However, when the dosage of methanesulfonic acid was over 20 %, and the yields decreased, but the decrease of liquefaction yield of benzylated wood meal was slower. After benzylation, benzene structure in the liquefaction product increased which inhibits the repolymerization of liquefaction product when catalyst was overdosed, also average molecular weight of liquefaction product was reduced simultaneously, and liquefaction was performed more completely. This has great significance for further utilization of wood liquefaction product.