关键词: 多糖, 离子液体, 乳酸甲酯, 催化转化

Abstract: Methyl lactate and lactic acid were synthesized by hydrolysis of starch and cellulose using SnCl₄ catalyst.The use of ionic liquids as the solvent was the key factor for the successful hydrolysis.The influence of catalyst,type of ionic liquids,reaction temperature and time on the product yield were investigated.The results indicated that methyl lactate and lactic acid can be obtained via liquid phase transformation catalyzed by SnCl₄ in 1,3-dimethylimidazolium methylsulfate ionic liquid at 140℃ for 2 h,the yield was 54% for starch and 15.1% for cellulose conversion.Fructose could be directly converted to lactic acid with almost stoichiometric yield,but only 64% for glucose.So,starch and cellulose were firstly catalyzed degradation to glucose that then was isomerized to fructose,and fructose decomposed to lactic acid finally.

Key words: saccharides, ionic liquids, methyl lactate, catalytic transformation