Recycling DMF from wastewater with octanol as extractant
LI Chun-li1,2, GAO Yu1, XIN Yan-rong1
1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China; 2. National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China
Abstract: 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%.
李春利, 高宇, 辛彦荣. 正辛醇作为萃取剂回收废水中低浓度的DMF[J]. 现代化工, 2017, 37(8): 203-206.
LI Chun-li, GAO Yu, XIN Yan-rong. Recycling DMF from wastewater with octanol as extractant. Modern Chemical Industry, 2017, 37(8): 203-206.
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