在离子液体体系中由微晶纤维素直接制得5-羟甲基糠醛

摘要

Process of microcrystalline cellulose(MC) dehydration to 5-hydroxymethyl-furaldehyde(5-HMF) using [Bmim][Cl] as solvent and acid ionic liquid [Bmim][HSO4] and CrCl3 as catalysts was studied. The effect of the temperature, reaction time,catalyst content, water content were investigated respectively. When [BmimJ[Cl] content is 4 g, MC content is 0.02 g, adding [Bmim][HSO4] content is 1 g and CrCl3 content is 0. 4 g at 130 ℃ , reaction time 4 h at normal conditions the molar ratio of 5-HMF is 37%. Experimental results demonstrate that the reaction system is active for the dehydration of MC into HMF under mild conditions.%研究了以自制的离子液体[Bmim][CI]为溶剂,酸性离子液体[Bmim-][HSO4]和CrCI3为催化剂,催化微晶纤维素脱水制备5-羟甲基糠醛的过程.分别考察了温度、时间、催化剂量、水含量对反应的影响.反应的优化条件为:常压下,[Bmim][CI]用量为4 g,微晶纤维素为0.02 g,在130℃下加入1 g[Bmim][HSO4]和0.4 g CrCI3,不加水,反应4h,5-HMF的摩尔收率可以达到37％.结果表明,在较温和的离子液体体系中直接转化微晶纤维素制得5-HMF是可行的.