微波辅助离子液体[EMIM][DEP]溶解甘蔗渣纤维素的研究  

Dissolution of Sugarcane Bagasse Cellulose in Ionic Liquid [EMIM][DEP] under Microwave Radiation

作　　者：崔丽虹[1] 王蒙[1] 魏晓奕[1] 吴浩[2] 李积华[1] 

机构地区：[1]中国热带农业科学院农产品加工研究所,广东湛江524001 [2]中国热带农业科学院南亚热带作物研究所,广东湛江524001

出　　处：《热带作物学报》2015年第2期411-416,共6页Chinese Journal of Tropical Crops

基　　金：海南省自然科学基金(No.313051);中国热带农业科学院中央级公益性科研院所基本科研业务费专项(No.1630062013012)

摘　　要：目前有关离子液体溶解纤维素(尤其是废弃纤维素)的工艺研究较少。以甘蔗渣纤维素为原料,采用微波辅助加热方式使其溶解于离子液体1-乙基-3-甲基咪唑磷酸二乙酯([EMIM][DEP])中,通过正交试验优化溶解工艺参数,并结合溶解工艺对甘蔗渣纤维素结构的影响,以确定最佳工艺。结果表明:温度对溶解时间和再生纤维素的聚合度影响较大,溶解时间随着温度的升高而明显缩短,但再生纤维素的聚合度随温度的升高而下降,因此综合考虑确定最佳工艺为110℃、装载量1%、微波功率400 W。采用FT-IR、XRD和乌氏粘度计对溶解前后纤维素的结构进行分析,结果表明甘蔗渣纤维素经过离子液体处理后未发生衍生化,晶型结构由纤维素Ⅰ型转变为纤维素Ⅱ型,结晶度由73.35%降至31.48%,聚合度降低了9.28%。There is limited data about the detailed process parameters of dissolution cellulose in ILs, especially for waste cellulose. The process parameters of sugarcane bagasse dissolution in ionic liquid 1-ethyl-3- methylimidazolium diethylphospbate （[EMIM] [DEP]）under microwave radiation was optimized. The effect of temperature, substrate loading concentration and microwave power on dissolution time and the yield of regenerated bagasse was tested by the orthogonal experiment. Fourier transform infrared spectroscopy, X-ray diffraction and Ubbelodhe viscometer were used to analyze the structure of original and regenerated cellulose. Based on the results, dissolution temperature and substrate loading concentration were found to be the significant factors that affected dissolution time. Also, dissolution temperature had great effect of on cellulose dissolution time and degree of polymerization. It should be considered that the effects of dissolution temperature on cellulose dissolution time and degree of polymerization. So the optimum condition was as follows： temperature 110 ℃, microwave power 400 W, substrate loading concentration 1%. After being treated by ionic liquid[EMIM][DEP], derivatization of sugarcane bagasse cellulose did not happen, but the crystal structure was rearranged from cellulose Ⅰ to cellulose Ⅱ, the CI decreased sharply from 73.35% to 31.48%, and the degree of polymerization decreased 9.28%.

关 键 词：甘蔗渣 纤维素 离子液体 微波溶解 正交试验 

分 类 号：TQ341.9[化学工程—化纤工业]