微波辐射下氯化锌催化纤维素转化为呋喃类物质的研究

以氯化锌作为溶剂和催化剂,利用微波辅助氯化锌降解纤维素,致使纤维素直接转化为5-羟甲基糠醛(5-HMF)和1-(2-呋喃基)-2-羟基-乙酮两种呋喃类物质。通过考察反应温度、反应时间、氯化锌用量、纤维素加入量、微波功率和加热方式等因素对其摩尔产率影响可知,在140 mL质量分数为69%的ZnCl₂溶液中,纤维素用量为1 g,反应温度为135 ℃,反应时间为5 min,微波功率为500 W时,5-羟甲基糠醛的摩尔产率达到19.4%,微波功率为600 W时,1-(2-呋喃基)-2-羟基-乙酮的摩尔产率达到12.0%。

Conversion of cellulose to furans catalyzed by zinc chloride under microwave irradiation

Cellulose was degraded in concentrated ZnCl2 solution which acted as a solvent and catalyst under microwave irradiation.Cellulose was directly converted into two main furans,5-hydroxymethyl furfural(5-HMF) and 1-(furan-2-yl)-2-hydroxyethanone.Factors affecting the mol yields of these two compounds were investigated at different temperatures,reaction times,concentrations of ZnCl2,cellulose contents,and microwave powers.For 1 g cellulose reacted with 140 mL 69% ZnCl2 solution,the mol yields of 5-HMF reached to 19.4% under the microwave power of 500 W and 1-(furan-2-yl)-2-hydroxyethanone reached to 12.0% under the microwave power of 600 W at 135 ℃ within 5 min.