关键词: 流程模拟, 精馏, 吸附, 膜分离, 高纯度酒精

Abstract: High pure alcohol is widely used in food, medicine, petrochemical and other industries. The common method to obtain high concentration of alcohol at home and abroad is alcohol five-column distillation, but the traditional distillation process is often accompanied by high energy consumption and high cost. In order to solve the above problems, a new distillation - adsorption - membrane separation coupling process was proposed in this paper to efficiently obtain high concentration alcohol from ethanol fermentation broth. Aspen Plus process simulation software was used to study 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 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, the mass fraction of ethanol reached 0.992 and the ethanol recovery was 65.6%. Compared with the traditional five-column distillation method, high pure alcohol can be obtained, and the energy consumption and equipment cost are relatively low, and the space utilization rate is also reduced, which has a good industrial prospect.

Key words: Process simulation, Distillation, Adsorption, Membrane separation, High pure alcohol