摘要
对杨木热水解过程中，半纤维素溶出的影响因素、特点以及水解液性能的变化规律进行了研究。结果表明：杨木片尺寸对聚戊糖的溶出有一定程度的影响，水解后木片的洗涤方式对木片聚戊糖含量影响较大。水解后木片吸附孔的比表面积、体积和孔径明显增加。提高水解P因子，吸附孔比表面积增大，聚戊糖溶出率增加，但P因子大于674时，聚戊糖溶出率变化不大，且过高的P因子会使木片比表面积和吸附累积孔体积均下降。水解液pH值在3．0～5．5之间时，高温有利于聚戊糖的溶出，但同时促进了糠醛的产生。基于生物质的综合利用，杨木片比较适宜的高温热水解条件为：温度170℃，保温时间60min。
The influencing factors, characteristics of poly-pentose dissolution and the change rules of hydrolysate in the processes of chip hydrolysis were Studied in this paper. The results showed that the size of chips affects the dissolution of ploy-pentose in a certain degree. The washing ways of the hot-water extracted chip have an important influence on the poly-pentose content in chip. The BET surface area, pore volume and pore size of the chips significantly increase after hydrolysis. Increasing P factor leads to the increase of BET surface area of chip and accelerates the dissolution of poly-pentose; however, the dissolution rate changes little when the P factor is more than 674. Too high P factor results in the decreases of BET surface and pore volume of the chip. The pH value of hydrolysate ranges from 3.0 to 5.5. The high hydrolysis temperature enhances the dissolution of pentose and also accelerates the production of furaldehyde. The suitable hydrolysis temperature of poplar chip is 170℃ and the holding time is 60 min for the comprehensive utilization of biomass.
出处
《纸和造纸》
北大核心
2014年第5期10-15,共6页
Paper and Paper Making
基金
国家自然科学基金(31370581)
山东省自然科学基金(05031601)
山东省教育厅项目(08030601)
关键词
杨木片
热水解
聚戊糖
水解液
poplar chip
hot water hydrolysis
ploy-pentose
hydrolysate
