STUDIES ON THE DISSOLUTION OF HOLOCELLULOSE IN IONIC LIQUID
The dissolution of bagasse holocellulose was explored in ionic liquid 1-butyl-3-methylimidazolium chloride (C4mimCl) assisted with ball-milling pretreatment and ultrasound irradiation. The dissolution process was monitored with polarizing light microscope. It was found that ball milling pretreatment and ultrasonic irradiation assistance could effectively improve the holocellulose dissolution in C4mimCl. Ball-milling of holocellulose for 1.5 and 4 h resulted in the reduction of dissolution time from 750 min for the unmilled holocellulose to 170 and 165 min, respectively. Irradiation of unmilled holocellulose with 30 W ultrasound for 30 min led to the decrease in dissolution time to 360 min. The combination of ball milling pretreatment and ultrasonic irradiation could further improve the holocellulose dissolution in C4mimCl. The effects of ultrasound power and irradiation duration on the dissolution time of ball milled holocelluloses in C4mimCl were also disscussed. The regenerated holocelluloses were characterized with FT-IR, X-Ray, and NMR. It was found that there were no obvious chemical struture changes after dissolution and regeneration of holocellulose. The crystalline structure of cellulose was converted from cellulose I in native holocellulose to cellulose II in regenerated holocellulose. The crystallinity decreased after dissolution and regeneration assisted with milling pretreatment and ultrasound irradiation.
ionic liquid holocellulose dissolution ultrasound irradiation
Yue Fengxia Lan Wu Liu Chuanfu Sun Runcang
State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,5 State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,5
国际会议
广州
英文
81-84
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）