磷钨酸盐催化果糖水解制备5-羟甲基糠醛

以磷钨酸盐为催化剂，研究了其对果糖水解过程的影响，考察了反应时间、温度、催化剂种类及用量等因素对5-羟甲基糠醛（5-HMF）收率的影响。实验结果表明：160℃时在二甲基亚砜（DMSO）中，以CePW12O40为催化剂，反应8h，5-HMF的收率最高为99.2%；该催化剂循环使用6次，仍能保持较高活性，5-HMF的收率仍能保持90.5%。与传统加热方法相比，微波加热可明显加快反应速率，缩短反应时间。

Conversion of fructose to 5-hydroxymethylfurfural catalyzed by heteropolyacid salts

The dehydration of fructose to 5-hydroxymethylfurfural(5-HMF) catalyzed by a variety of heteropolyacid salts has been studied.The highest 5-HMF yield was 99.2%,obtained using a CePW12O40 catalyst in DMSO with 5%(mass fraction) of catalyst at 160 ℃ with reaction time 8h.Furthermore,the conversion of fructose to 5-HMF catalyzed by heteropolyacid salts was conducted under microwave conditions.Compared with the conventional heating method,microwave heating showed a remarkable ability to both accelerate the reaction rate and improve the yield of 5-HMF.Moreover,the catalyst could be separated from the reaction mixture by a simple process at the end of the reaction and the catalyst could be reused six times without loss of activity.