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主要研究了在微波条件下,金属盐-酸混合二元体系催化纤维素醇解制备乙酰丙酸甲酯的反应.在SnCl_4和H_2SO_4的协同作用下,纤维素被高效转化,获得了61.5%的乙酰丙酸甲酯的产率.考察了催化剂比例、反应时间和反应温度等参数对反应产率和选择性的影响,研究了水的加入对于反应的促进作用.同时,将该体系应用到多种生物质原料(如蔗糖、淀粉和菊粉等)转化为乙酰丙酸甲酯的反应中,取得了48%~60%的产率.催化剂经过5次的连续回收和重复使用,依然保持了良好的催化活性.
In this paper, we studied the synthesis of methyl levulinate catalyzed by the alcohol-dicarboxylic acid binary system catalyzed by metal salt-acid mixed binary system under the condition of microwave irradiation.The cellulose was efficiently transformed under the synergistic effect of SnCl 4 and H 2 SO 4, yielding 61.5% The yield of methyl levulinic acid was investigated.The effects of the ratio of catalyst, reaction time and reaction temperature on the yield and selectivity of the reaction were investigated.The effect of water addition on the reaction was also studied.The system was also applied to more The conversion of biomass raw materials (such as sucrose, starch and inulin) to methyl levulinic acid achieved a yield of 48% to 60% .The catalyst was continuously recovered and reused five times and remained Good catalytic activity.