磷钨酸催化混合C4合成醋酸仲丁酯

Synthesis of Sec-butyl Acetate from Mixed C4 using the catalyst of Phosphotungstic Acid

为了充分利用C4资源,以磷钨酸为催化剂,研究了混合C4(含1-丁烯、正丁烷、异丁烷)和冰醋酸合成醋酸仲丁酯的反应。考察了反应时间、反应温度、反应压力、催化剂用量、烯酸摩尔比对醋酸转化率的影响。结果表明,最佳合成工艺条件为:反应时间7h,反应温度170℃,反应压力5.3MPa,w(催化剂)=22.9%(相对于酸质量),n(1-丁烯)∶n(醋酸)=3.5∶1;在该条件下,醋酸转化率为91.4%,酯化选择性为90%。

In order to make full use of the resources of mixed C4, the esterification of acetic acid with the C4 mixture （which were composed of 1-butene, n-butane and isobutane ） was studied by using phosphotungstic acid as the catalyst. The effect of various factors, such as reaction time, reaction temperature, reaction pressure, the amount of catalysts and the effect of the molar ratio of 1-butene to acetic acid, on the yield of see-butyl acetate were carefully investigated. The experimental results show that the optimum reaction conditions were： reaction time 7 h, reaction temperature 170℃, reaction pressure 5.3 MPa, w （catalyst） = 22.9% （ nelative to the mass of acid） and n （ 1 -butene ） ： n （ acetic acid） = 3.5 ： 1 ; under the above conditions, the conversion of acetic acid reached 91.4%, and the selectivity of see-butyl acetate was 90%.