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以乙醇-乙腈混合物为对象,研究了该体系在实验压力范围内的共沸组成,分析了采用变压精馏工艺分离精制乙醇和乙腈的可行性。通过比较实验压力范围内(101~500 kPa)体系的共沸组成与Aspen Plus模拟软件中计算的体系共沸组成,选择了适合的物性方法。在实验装置上进行了变压精馏法分离精制乙醇、乙腈混合物的实验,重点考察了不同回流比对分离效果的影响,得到了质量分数大于99.5%的乙醇和乙腈产品。应用Aspen Plus模拟软件对乙醇-乙腈体系的热集成变压精馏过程进行了模拟计算,对比了热集成变压精馏与传统变压精馏的能耗,发现热集成变压精馏节能达35%。
The azeotropic composition of the system in the experimental pressure range was studied with ethanol - acetonitrile mixture. The feasibility of separation and purification of ethanol and acetonitrile by the pressure swing distillation was analyzed. By comparing the azeotropic composition of the system in the experimental pressure range (101 ~ 500 kPa) with that calculated in the Aspen Plus simulation software, a suitable physical method was selected. The experiments of separation and purification of ethanol and acetonitrile mixture by pressure swing distillation were carried out on the experimental device. The effects of different reflux ratio on the separation efficiency were investigated. The products of ethanol and acetonitrile with the mass fraction greater than 99.5% were obtained. Aspen Plus simulation software was used to simulate the heat-integrated pressure-swing distillation process of ethanol-acetonitrile system. The energy consumption of heat-integrated pressure-swing distillation and traditional pressure-swing distillation was compared. It was found that energy- 35%.