醋酸甲酯对醋酸脱水共沸精馏过程的影响

利用化工流程模拟软件Aspen Plus模拟了精对苯二甲酸（PTA）装置中醋酸脱水共沸精馏系统，系统研究了醋酸甲酯（MA）对该过程能耗的影响。研究表明，MA会在脱水塔内累积，进料中MA含量增多将导致脱水塔负荷直线增加。在脱水塔塔顶和分相器之间设置部分冷凝装置，将含较多MA的气相引至回收塔，可大大减少MA在系统内的循环量，从而有效降低脱水塔能耗。

Influence of Methyl Acetate on Process of Acetic Acid Dehydration via Azeotropic Distillation

An acetic acid dehydration system via azeotropic distillation in the device for pure terephthalic acid (PTA) process is simulated by Aspen Plus. The influence of methyl acetate (MA) on the energy consumption of this process is studied systematically. The data show that MA will accumulate in the dehydrating tower, and the load of the tower will linearly increase with increasing MA content. By setting up partial condensation equipments between the dehydrating tower and the phase resolver to bring the vapor phase with more MA into the recovery tower, the circulation rate in MA system can be reduced significantly, and thus the energy consumption in the dehydration tower decreases. These results should have certain guidance for the design and production of PTA dehydration process.