MnCl_2/活性炭催化合成正丁基氨基甲酸甲酯

通过对不同活性组分的筛选,开发出活性炭负载氯化锰(M nC l2/AC)催化剂,用于碳酸二甲酯(DMC)和正丁胺甲氧羰基化反应合成正丁基氨基甲酸甲酯(MBC)。考察了M nC l2负载量对M nC l2/AC催化剂催化性能的影响及反应温度、反应时间、催化剂用量和原料配比对反应的影响。实验结果表明,适宜的M nC l2负载量为0.2mm ol/g;适宜的反应条件为:n(DMC)∶n(正丁胺)=3,催化剂的质量分数为5%,反应温度80℃,反应时间7h。在此条件下,正丁胺能完全转化,MBC的收率达到96.5%。探讨了不同载体负载的M nC l2催化剂的催化性能,发现中性载体有利于甲氧羰基化反应。

Synthesis of Methyl N-Butyl Carbamate over MnCl2/Active Carbon

Supported catalyst MnCl_2/active carbon(AC)was prepared and used in synthesis of methyl N-butyl carbamate from dimethyl carbonate(DMC)and n-butylamine.Effect of MnCl_2 loading amount on catalyst activity,and influences of catalyst dosage,reaction temperature,time and mole ratio of reactants on reaction were investigated.Suitable MnCl_2 loading amount is(0.2)mmol/g.Under optimal conditions:n(n-butylamine) ∶n(DMC)3,mass fraction of catalyst 5%,80℃ and 7h,(n-butylamine) conversion and methyl Nbutyl carbamate yield can reach 100% and(96.5%,)respectively.Different supports were tested for the MnCl_2 loaded catalysts.Neutral support,namely AC or SiO_2 especially the former,is proved to be most satisfactory.