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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%。
The use of high boiling point n-octanol as a low concentration of N, N-dimethylformamide (DMF) wastewater recycling extractant. The liquid-liquid equilibrium data of DMF-water-n-octanol ternary system were measured at atmospheric pressure and temperature of 25 and 30 ℃, respectively. The two-phase composition of the equilibrium system was obtained. The NRTL and UNIQUAC equations are used to correlate the experimental data. The UNIQUAC model is more suitable for predicting the ternary system because the maximum deviation between the predicted and the experimental values using the UNIQUAC model is small. Aspen Plus was used to simulate the process of wastewater DMF recovery. The single-factor analysis was used to optimize each operating parameter. Compared with the traditional process, energy consumption was reduced by about 65% and reboiler duty reduced by 55% %.