摘要
采用离子液体1-乙基-3-甲基咪唑醋酸盐(Emim AC)溶解杨木木粉,研究杨木粉在Emim AC中的溶解性能。通过单因素和正交试验优化得到溶解最佳条件为:溶解温度160℃,溶解时间16 h,木粉含水量7.5%,超声波预处理时间10 min,在此条件下,杨木粉溶解率为48.30%。在溶解过程中,未溶部分的总木质素含量呈现先增加后减小的趋势,在溶解时间为6 h时总木质素由原料的26.29%增至最大29.43%。通过SEM、XRD、FT-IR对溶解前后木粉结构进行了表征,结果表明,溶解过程中Emim AC对杨木粉结构造成了一定破坏,在溶解时间为16 h时,结晶度由原来的45.43%降至29.03%,但此过程中并没有相应衍生物的产生,Emim AC是杨木粉的强而有效的直接性溶剂,为生物质的高效利用打下了基础。
The solubility of poplar powder in Emim AC was studied. By single factor and orthogonal experiment,the optimum dissolution conditions were obtained as follows： dissolution temperature 160℃,dissolution time 16 h,moisture content of poplar powder 7. 5%,time by ultrasonic waves 10 min. Under the optimum dissolution conditions,the dissolution rate was 48. 30%.Furthermore,the total insoluble content of lignin increased at first and then decreased. It reached the maximum value of 29. 29%when the dissolution time was 6 h. The structures of poplar powder before and after dissolving were analyzed by SEM,XRD and FT-IR. It was found that structure damage of poplar powder occured when the dissolution time was 16 h,and the crystallinity reduced from 45. 43% to 29. 03%. However,there are no corresponding derivatives generated from dissolution process. This paper showed that Emim AC was a strong and effective direct solvent.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2015年第5期22-28,共7页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(31270626
31270627
31370580)
