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在釜式反应器中研究了甲缩醛与甲酸偶联生成甲氧基乙酸甲酯的反应。测试了几种催化剂的催化性能,并选定对甲苯磺酸催化剂作进一步的实验研究。考察了反应温度、反应时间、原料配比、催化剂用量等对甲氧基乙酸甲酯收率的影响,确定最佳反应条件为:n(甲缩醛):n(甲酸)=0.36,催化剂用量为甲缩醛质量的1.8%,反应温度140℃,反应时间4h。在此条件下,甲氧基乙酸甲酯的收率为87.1%。
The reaction of methylal with formic acid to form methyl methoxyacetate was studied in a pot reactor. The catalytic performance of several catalysts was tested and the p-toluenesulfonic acid catalyst was selected for further experimental study. The effects of reaction temperature, reaction time, the ratio of raw materials and the amount of catalyst on the yield of methyl methoxyacetate were investigated. The optimal reaction conditions were n (methylal) = 0.36, the amount of catalyst 1.8% of the mass of methylal, reaction temperature 140 ℃, reaction time 4h. Under this condition, the yield of methyl methoxyacetate was 87.1%.