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研究了几种磺酸功能化离子液体催化纤维素在生物丁醇中转化为乙酰丙酸丁酯的性能.系统考察了催化剂的酸强度,用量,反应温度,时间和溶剂对纤维素转化效率和产物分布规律的影响.实验结果表明酸度最强的磺酸功能化离子液体1-(4-磺酸丁基)-3-甲基咪唑硫酸氢盐([C4H8SO3Hmim]HSO4)能够有效地催化纤维素转化为乙酰丙酸丁酯,且在优化的反应条件下纤维素的转化率高达98.4%,乙酰丙酸丁酯的产率为31.1%,同时共生产物甲酸丁酯、水溶性产物和生物油的产率分别为33.4%、20.6%和23.8%.该催化体系具有一定的耐水性能,水的添加量为0.2 m L时并不会严重影响纤维素的转化率.此外,酸性离子液体催化剂还表现出了良好的重复使用性能,使用六次后仍然保持较高的活性.
Several sulfonic acid functionalized ionic liquids were used to catalyze the conversion of cellulose into butyl levulinate in biobutanol.The effects of acid strength, amount, reaction temperature and time of the catalyst on the conversion efficiency of cellulose, The results showed that sulfonic acid functionalized ionic liquid 1- (4-sulfobutyl) -3-methylimidazolium hydrogen sulfate ([C4H8SO3Hmim] HSO4) with the strongest acidity could effectively catalyze the hydrolysis of cellulose Was converted to butyl levulinate and the conversion of cellulose was as high as 98.4% and the yield of butyl levulinate was 31.1% under optimized reaction conditions, while the co-productive products of butyl formate, water-soluble product and bio-oil The yields were 33.4%, 20.6% and 23.8%, respectively, and the catalytic system had a certain degree of water resistance.When the water addition was 0.2 m L, the conversion of cellulose would not be seriously affected.In addition, Out of the good reusable performance, after using six still maintain a high activity.