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本课题主要利用化工过程模拟软件Aspen Plus 2006对环己烷—异丙醇共沸物系的一般分离方法和变压精馏分离方法稳态过程进行了模拟,对总理论板数、回流比、进料位置、进料温度等操作参数进行了优化。对于一般分离方法的普通精馏、萃取精馏过程进行模拟,萃取精馏稳态过程选取乙二醇作为萃取剂,对塔的工艺操作参数进行了优化,环己烷和异丙醇产品浓度均达到99.9wt%以上;对于变压精馏稳态过程,主要研究了减压塔进料(包括常压塔回减压塔的循环物流进料和原料进料)位置,温度对分离过程的影响,最终对工艺操作参数进行优化,产品浓度均能够达到99.9wt%。实验过程研究了环己烷-异丙醇共沸物的变压精馏分离过程。分别利用间歇精馏研究了减压塔和常压塔部分实验过程,实验结果与模拟结果较为吻合。模拟以及实验研究结果表明,变压精馏分离共沸物具有工艺过程简单,不引入额外杂质的优点,同时也有能耗高的不足。在本文的最后对变压精馏节能方面进行了研究,通过热集成过程和盐效应改变共沸组成,达到了节约能耗的目的。
In this paper, the general separation method of cyclohexane-isopropanol azeotrope system and the steady-state process of pressure swing distillation separation method were mainly simulated by Aspen Plus 2006 chemical process simulation software. The total plate number, reflux ratio, Feed location, feed temperature and other operating parameters were optimized. The general distillation and extractive distillation processes were simulated. The steady-state extraction and rectification process selected ethylene glycol as the extractant to optimize the process parameters of the column. Both the concentration of cyclohexane and isopropanol Which is more than 99.9wt%. For the steady-state process of pressure swing distillation, the effects of temperature on the separation process are mainly studied on the position of the vacuum tower feed (including the recycle feed and raw material feed back to the vacuum tower) , The final process parameters are optimized, the product concentration can reach 99.9wt%. Experimental study of the cyclohexane - isopropanol azeotrope distillation pressure swing distillation process. The experiments of vacuum tower and atmospheric tower were studied respectively by batch distillation. The experimental results are in good agreement with the simulation results. Simulation and experimental results show that the separation of azeotrope by pressure swing distillation has the advantages of simple process, no additional impurities, and high energy consumption. At the end of this paper, the energy-saving aspects of pressure-swing distillation have been studied. The heat-integration process and the salt effect can change the azeotropic composition to save energy.