采用高沸点的正辛醇作为低浓度N，N-二甲基甲酰胺（DMF）废水回收处理的萃取剂。在常压，温度分别为25、30℃时，测得DMF-水-正辛醇三元物系的液液平衡数据，得到该平衡体系的两相组成。采用NRTL和UNIQUAC方程对实验数据进行关联，其中使用UNIQUAC模型的预测值和实验值的最大偏差较小，所以UNIQUAC模型更适合预测该三元体系。使用Aspen Plus对废水DMF回收处理的工艺过程进行模拟，利用单因素分析对各个操作参数进行优化，与传统的工艺流程进行能耗对比，冷凝器负荷减少约65%，再沸器负荷减少约55%。

Octanol is used as extractant for treatment of low concentrate N,N-dimethyl formamide (DMF) containing waste water.Liquid-liquid equilibrium (LLE) data for the ternary system of DMF-water-octanol at 25℃ and 30℃ respectively are determined at atmospheric pressure and the compositions of two phases for this equilibrium system are gained.NRTL and UNIQUAC models are respectively used to correlate the experimental liquid-liquid equilibrium data of the ternary system.Of which,the relative deviation between experimental data and simulated values using UNIQUAC model is less than by using NRTL model.Therefore,UNIQUAC model is more suitable for forecasting this ternary system.A model for DMF recycling from waste-water process is established and optimized by using Aspen Plus.Compared to the conventional double-effect distillation method,the condenser duty of this process saves more than about 65%,and the reboiler duty drops about 55%.