MgO/γ-Al_2O_3催化酯交换合成碳酸甲丁酯

SYNTHESIS OF BUTYL METHYL CARBONATE VIA LIQUID-PHASE TRANSESTERIFICATION OVER MgO/γ-Al_2O_3 CATALYST

通过活性组分和载体筛选制备了MgO/γ-Al_2O_3催化剂,用于碳酸二甲酯(DMC)和正丁醇液相酯交换反应合成碳酸甲丁酯(BMC),并考察了活性组分前驱物、催化剂焙烧温度和活性组分负载量对催化剂活性的影响。结果表明,以Mg(OAc)_2·4H_2O为活性组分前驱物,催化剂焙烧温度为400℃,活性组分MgO负载量为5%时,MgO/γ-Al_2O_3表现出高的酯交换反应催化活性。同时考察了反应温度、原料配比对酯交换反应的影响,适宜的反应温度为100℃;物料配比n(DMC):n(正丁醇)=3:1时,正丁醇的转化率达到98.4%,BMC的选择性为91.9%,收率为90.4%。催化剂重复实验表明催化剂重复使用性能良好。

The catalysts for the liquid-phase transesterification of dimethyl carbonate with butanol to produce butyl methyl carbonate were investigated. MgO/γ-Al2O3 displayed higher activity for the transesterification. The effects of the preparation parameters of the catalysts and the reaction conditions on the activity were evaluated in terms of butanol conversion and BMC selectivity. The results showed that the preferable parameters were. using Mg（OAc）2 · 4H2O as the magnesia precursor, calcination temperature 400 ℃ and magnesia loading 5%. Furthermore, at reaction temperature of 100 ℃ and using the feed ratio of n（DMC） ： n（Butanol） =3 ： 1, the butanol conversion of 98.4% and BMC selectivity of 91.9% were achieved with the BMC yield of 90.4%. The reusability of the catalyst was shown to be very good.