催化精馏合成甲酸环己酯-乙酸环己酯联产过程模拟计算及优化

Simulation on co-production of cyclohexyl formate and cyclohexyl acetate by catalytic distillation

根据甲酸环己酯和乙酸环己酯体系的特点,提出了两者的联产流程,并利用Aspen Plus软件对该过程进行了模拟计算。选择了甲酸环己酯和乙酸环己酯体系适宜的热力学计算方法和动力学模型,控制甲酸环己酯和乙酸环己酯产品浓度不变,考查了环己醇进料位置,甲酸、乙酸混合液进料位置、进料摩尔比、酸酯分离塔进料位置、环己酯精制塔塔顶回流比对联产体系能耗的影响,得出了适宜的联产操作条件,在该条件下比较联产工艺和单产工艺的能耗,节能效果明显。

A co-production process for cyclohexyl formate and cyclohexyl acetate is proposed according to their characteristics,and is simulated by means of Aspen Plus software. The thermodynamic calculation method and kinetic models suitable for cyclohexyl formate and cyclohexyl acetate esterification system are selected. The influences of the feeding position of cyclohexanol,the feeding position of formic acid and acetic acid mixture,the molar ratio of feed materials,the feeding position at acid and ester separation tower,and the reflux ratio of cyclohexyl ester refining tower on the energy consumption of the co-production is investigated with the concentrations of cyclohexyl formate and cyclohexyl acetate products as invariables.The suitable operation conditions for the co-production process are obtained,under which the energy consumption of the co-production process exhibits obvious energy-saving effect,compared with the singleproduction process.