微波下纤维素在LiBr/H2O/DMAc体系中转化制备5-HMF的研究

Microwave Assisted Preparation of 5-HMF from Cellulose in LiBr/H2O/DMAc System

将纤维素溶解于LiBr、H2O和N,N-二甲基乙酰胺（DMAc）组成的溶液体系中,在微波加热的条件下转化成5-羟甲基糠醛（5-HMF）。实验分别考察了溴化锂浓度、微波功率、反应时间、纤维素质量以及LiBr溶液与DMAc的体积比等因素对5-HMF产率的影响。优化后的实验结果表明,150 mg纤维素溶解于62%溴化锂溶液中,在微波功率为420 W、加热时间为22 min以及V（LiBr溶液）∶V（DMAc）=1∶1的条件下,5-HMF的产率最高可达58.4%。

Cellulose,which was dissolved in the homogeneous system of LiBr,H2O and N,N-dimethylacetamide（ DMAc）,was reacted in microwave to produce 5-hydroxymethyl furfural（ 5-HMF）. In this work,the effects of concentration of LiBr,microwave power,reaction time,quality of cellulose and the relative ratio of the volume of LiBr solution and DMAc were investigated.The optimized results indicated that when 150 mg cellulose was dissolved in 62% LiBr solution,relative ratio of the volume of LiBr solution and DMAc was 1 ∶1,reacted in microwave for 22 min with microwave power of 420 W,the yield of 5-HMF reached 58. 4%.