精馏-吸附-膜分离耦合工艺制备高纯度酒精流程模拟

高纯度酒精广泛应用于食品、医药和石油化工等行业，国内外制备高纯度酒精的常用方法为酒精五塔精馏，但传统酒精精馏工艺往往伴随高能耗与高成本。为了解决上述问题，本文提出一种精馏-吸附-膜分离耦合新工艺，从乙醇发酵液中高效获得高纯度酒精。借助Aspen Plus流程模拟软件对精馏-吸附-膜分离耦合工艺进行研究，并用灵敏度分析工具对其精馏塔部分进行参数优化。结果表明，当精馏塔的塔板数为37、回流比为9、进料位置为第35块塔板、吸附剂采用天然沸石、膜分离用聚偏氟乙烯渗透汽化膜时，乙醇质量分数达到99.2%，乙醇回收率为65.6%。与传统五塔精馏方法相比不仅能获得高纯度酒精，而且能耗与设备成本相对较低，也充分提高了空间利用率，具有很好的工业前景。

Simulation of high pure alcohol preparation by distillation-adsorption-membrane separation coupling process

High pure alcohol is widely used in food, medicine, petrochemical, etc. The common method for the preparation of high concentration of alcohol is alcohol five-column distillation, but the traditional distillation process is often accompanied by high energy consumption and high cost. To solve the above problems, a new distillation-adsorption-membrane separation coupling process was proposed in this study to efficiently obtain high concentration alcohol from ethanol fermentation broth. Aspen Plus process simulation software was used to investigate the distillation-adsorption-membrane separation coupling process, and the sensitivity analysis tool was used to optimize the parameters of the distillation column. The results showed that the mass fraction of ethanol reached 99.2% and the ethanol recovery was 65.6% when the number of trays in the distillation column was 37, the reflux ratio was 9, the feeding position was the 35th tray, the adsorbent was natural zeolite and the membrane was separated by polyvinylidene fluoride pervaporation membrane. Compared with the traditional five-column distillation method, high pure alcohol can be obtained with low energy consumption and equipment cost. Meanwhile, the space utilization rate is also reduced. This study reveals that distillation-adsorption-membrane separation coupling process has a good industrial prospect.