聚合离子液体催化蔗糖麦芽糖制备5-羟甲基糠醛

以咪唑和环氧氯丙烷为单体制备了聚合离子液体，通过阴离子交换得到了聚咪唑-环氧氯丙烷四氟硼酸盐离子液体，并通过核磁、红外分析和凝胶过滤色谱法确定了其结构和分子量分布。在二甲基亚砜（DMSO）溶剂中，该催化剂催化蔗糖和麦芽糖制备5-羟甲基糠醛（5-HMF）表现出了较好的催化活性。以蔗糖为原料（以1.0g计），温度为180℃，催化剂的用量为0.4g，5-HMF收率为71.4%。以麦芽糖为原料（以10g计），温度为180℃，催化剂的用量为0.4g，5-HMF收率为39.8%。催化剂经循环利用8次仍能保持较高的催化活性。

Preparation of 5-hydroxymethylfurfural from sucrose and maltose catalyzed by poly(ionic liquid)s

A poly (imidazole-epichlorohydrin) ionic liquid has been synthesized by the reaction of imidazole and epichlorohydrin. Then poly(imidazole-epichlorohydrin)BF4- was prepared by anion exchange and characterized by FT-IR, NMR, and GPC methods. The poly(ionic liquid)(PIL) has a perfect degree of polymerization and very narrow relative molecular weight distribution. The dehydration of sucrose and maltose to 5-hydroxymethylfurfural (5-HMF) was successfully conducted using the poly(imidazole-epichlorohydrin)BF4- catalyst in dimethyl sulfoxide (DMSO) as solvent. This reaction system showed a good catalytic performance for both sucrose and maltose. The highest 5-HMF yields of 71.4% and 39.8% were obtained from the dehydration of sucrose and maltose in a short time catalyzed by small usage of poly(imidazole-epichlorohydrin)BF4-, respectively. The catalyst was recycled eight times without obvious loss of activity.