酸功能高铼酸盐离子液体降解纤维素研究

Degradation of cellulose catalyzed by acid function perrhenate ionic liquid

选用微晶纤维素(MCC)进行降解,以降解液中还原糖和葡萄糖收率为考察目标,从反应温度、反应时间、反应物浓度、催化剂用量和催化剂种类几个方面考察其降解效果。结果表明,最优条件为:以酸功能高铼酸盐离子液体作为催化剂,以离子液体[Amim]Cl为溶剂,纤维素用量0.1 g,催化剂用量5%(摩尔分数),反应温度155℃,反应时间20 min。在此条件下,可还原糖收率(TRS)和葡萄糖收率最高可达94.6%和44.3%。另外,还以CrCl 3和酸功能高铼酸盐复合制备5-羟甲基糠醛(5-HMF),结果表明葡萄糖的高收率是提高5-HMF产率的重要保障。

Microcrystalline cellulose(MCC)was used for degradation.Taking the yield of reducing sugar and glucose in the degradation solution as the research target,the degradation effect was investigated from the aspects of reaction temperature,reaction time,reactant concentration,catalyst dosage and catalyst type.The result showed that the optimal conditions were as follows:acid-based perrhenate ionic liquid as catalyst,ionic liquid[Amim]Cl as solvent,cellulose dosage 0.1 g,catalyst dosage 5%,reaction temperature 155℃,reaction time 20 min.Under these conditions,the reductive sugar yield(TRS)and glucose yield can be as high as 94.6%and 44.3%.CrCl 3 and acid functional perrhenate were used as catalysts to promote the microcrystalline cellulose degradation to 5-hydroxylmethylfurfural(5-HMF).The results show that the high yield of glucose is an important guarantee for increasing the yield of 5-HMF.