离子液体[Mmim]DMP对不同木质纤维的溶解性能

Ionic Liquid [Mmim]DMP's Dissolution Property for Different Types of Lignocellulosic Fiber

研究了咪唑类离子液体1,3-二甲基咪唑磷酸二甲酯盐[Mmim]DMP对于制浆造纸纤维原料桉木、芒秆和蔗渣的全组分溶解过程。结果表明:[Mmim]DMP在一定条件下对三种原料的溶解率分别为6.34%、9.24%和19.36%。对原料、未溶残渣和溶解析出物进行红外光谱和扫描电镜观察发现,三种原料在溶解过程中纤维素、半纤维素和木质素三种成分都被部分溶解,但其中桉木木素更易于溶解在离子液体。溶解后桉木残渣的木质素相对含量下降明显,综纤维素相对含量上升,表明[Mmim]DMP对桉木有较好的木质素溶出效果。

This paper studied on the process that imidazole ionic liquid [Mmim]DMP dissolves all components of pulping and papermaking fiber materials eucalyptus,Chinese silvergrass and bagasse. Results indicated that： Under certain conditions dissolution rate of three raw materials dissolved by [Mmim]DMP were 6. 34%,9. 24% and19. 36%. After FT-IR analysis and SEM observation of raw materials,undissolved residues and precipitates,it was found that during three raw materials＇ dissolution process three components cellulose,hemicellulose and lignin were dissolved partially,but eucalyptus＇ s lignin was more readily dissolved in the ionic liquid. After dissolution relative content of lignin in eucalyptus＇ s residue decreased obviously,meanwhile relative content of holocellulose increased,which showed that [Mmim]DMP had a better lignin＇s dissolution effect for eucalyptus.