METHOD FOR PREPARING 5-HYDROXYMETHYL FURFURAL BY CATALYZING HEXOSE WITH IONIC LIQUID

摘要

Provided is a method for preparing 5-hydroxymethyl furfural by catalyzing a hexose with an ionic liquid. With the acidic ionic liquid serving as a catalyst and the hexose serving as a raw material, 5-hydroxymethyl furfural is prepared by dehydration in an inorganic salt-saturated aqueous solution-organic solvent two-phase system. The acidic ionic liquid is capable of promoting a reaction to produce 5-hydroxymethyl furfural; moreover, the acidic ionic liquid does not go in to the organic phase, thus facilitating separation, recycle, and reuse. The solvent is removed by means of vacuum distillation to produce the target product 5-hydroxymethyl furfural, the purity thereof being 98%. When fructose is used as a raw material, the yield of 5-hydroxymethyl furfural is 75-95%; when glucose is used as a raw material, the yield of 5-hydroxymethyl furfural is 45-72%; and, when galactose and mannose serve as raw materials, the yield of 5-hydroxymethyl furfural is 42-53%.