离子液体-水体系循环使用对白松木质素提取的影响

Effect of recycle of ionic liquid on its performance of white pine lignin extraction

使用氯代丁基咪唑盐离子液体的水溶液分离白松中的木质素。在[C4min]Cl/H2O质量比为6∶4,混合液与白松质量比为10∶1,提取温度150℃下,提取白松木质素。离子液体-水可多次循环用于提取白松木质素,溶剂体系循环使用对木屑失重率、木屑残渣综纤维素含量和离子液体木质素提取率均有影响。通过UV和FTIR分析提取物的结构,并与磨木木素比较,证明提取物中有木质素的特征官能团。通过SEM分析观察提取木质素前后木屑表面的变化,发现提取后木屑表面出现了大量纹孔,纹孔膜消失。

This paper investigated the recycling of ionic liquid-[Bmim]Cl in the extraction of white pine lignin.The extraction condition as following:the ratio of solvent to pine powder was 10∶1,ionic liquid concentration was 60%,the extraction is at 150℃for 2h.The results showed that ionic liquid could be recycled after the extraction of white pine lignin,but the sawdust mass loss,the holocellulose content in the residue wood chip and ionic liquid lignin extraction rate were all influenced by the recycling of the solvents.The UV and FT-IR spectrum were used to determine the chemical structure of the extraction materials.Through the comparison with mill wood lignin,there exist characteristic functional groups of lignin.The SEM analysis was used to investigate the surface change of the wood before and after extraction,which show a lot of sawdust pits on the surface,along with the disappearance of pit membranes.