碱性离子液体催化单糖脱水制5-羟甲基糠醛

Monosaccharide dehydration to 5-hydroxymethylfurfural catalyzed by alkaline ionic liquid

离子液体作为一种新型的环境友好溶剂和液体酸碱催化剂用于单糖脱水制备5-羟甲基糠醛日益成为研究热点,受到广泛重视。以典型的OH-为阴离子的碱性离子液体为催化剂,研究了其对果糖/葡萄糖转化为5-羟甲基糠醛反应的影响。结果表明,在二甲基亚砜中,160℃反应6 h,果糖转化率达90.4%,5-羟甲基糠醛收率为83.3%,5-羟甲基糠醛选择性为92.1%。这一新的碱性离子液体催化单糖脱水的体系,取代了传统酸性催化剂的使用,具有高效、环保、经济的特点,为5-HMF规模化生产奠定了基础。

As a way of producing liquid fuels from renewable resources ,the preparation of 5-hydroxymethylfur- fural （5-HMF） through the dehydration of monosaccharide （fructose and glucose） with room temperature ionic liquids （ILs） has been paid much attention to, but the cost of the process is greatly increased with ILs as a solvent rather than as a catalyst. The influence of the alkaline ionic liquid used as the catalyst on the conversion of monosaccharide to 5-HMF was investigated. The results showed that using dimethylsulfoxide （DMSO） as the solvent,5-HMF yield of 83.3% ,the selectivity to 5-HMF of 92.1% and fructose conversion of 90.4% were attained under the condition of reaction temperature 160 ℃and reaction time 6 h. The alkaline ionic liquid catalyst system for the dehydration of monosaccharide ,which replaced the conventional acidic catalysts, possessed high effeciency, environmental protection and economic characteristics.