利用Aspen Plus软件模拟技术，对甲醇-乙醇-水体系进行萃取精馏模拟计算，并用实验进行验证。考察了三塔萃取精馏过程中的T1塔、B1塔和B2塔的塔板数、溶剂比（质量比）、进料位置以及回流比对分离产物纯度的影响，确定了萃取精馏塔T1的塔板数为25，回流比为0.4，原料进料位置在19块塔板，萃取剂进料位置在第5块塔板，B1塔的塔板数为38，回流比12，进料位置在18块塔板，B2塔的塔板数为20，回流比0.27，进料位置在13块塔板。在此条件下，99.511%的甲醇收率高达99.754%，99.829%的乙醇收率高达99.887%，模拟结果与实验结果数据吻合度较高，说明该萃取精馏过程能将甲醇-乙醇-水体系高效分开，该模型适用于分离甲醇-乙醇-水混合物。

The extractive distillation process for the methanol-ethanol-water system is simulated by using Aspen Plus software,then the simulation is verified by the experiment data.Effects of the number of plates in three columns,the mass ratio of extractant to feedstock,the feed positions of extractant and mixture and the reflux ratio on the purities of products are investigated.The optimal conditions for the column T1 are confirmed that the number of plates is 25,the reflux ratio is 0.4,the feed position of extractant is at the 5th plate and the feed position of feedstock is at the 19th plate;Those for the column B1 are as follows:the number of plates is 38,the reflux ratio is 12,and the feed position of materials is at the 18th plate;For the column B2,the number of plates is 20,the reflux ratio is 0.27,and the feed position of materials is at the 13th plate.Under these optimized conditions,the mass fraction of methanol reaches 99.511% and the recovery ratio for methanol is as high as 99.75%;the mass fraction of ethanol reaches 99.829% and the recovery ratio achieves 99.88%.The simulation results are in good agreement with the experiment data,indicating that the extractive distillation process can efficiently separate the methanol-ethanol-water system and the model is suitable for the separation of methanol-ethanol-water mixture.

梁朋(1991-),男,硕士生