N,N-二甲基甲酰胺-三氯甲烷-水物系液液相平衡研究

Liquid-liquid Equilibrium of N,N-Dimethylformamide-Chloroform-Water Ternary System

为了获得制革DMF废水萃取回收工艺所需的基础数据,在常压20℃温度下,测定了三氯甲烷-N,N-二甲基甲酰胺-水拟三元体系的液液平衡数据,得到了三元体系平衡相图。实验数据点用NRTL模型进行了关联,得出了三氯甲烷-N,N-二甲基甲酰胺-水拟三元体系的模型参数。将实验数据与关联结果比较,表明NRTL模型能对该物系进行较准确关联。

The study on liquid-liquid equilibrium（LLE） is important for N,N-dimethylformamide（DMF） recovery from synthetic leather wastewater by extraction.In order to achieve the basic data,the LLE data of DMF-chloroform water pseudo ternary system were determined at 20 ℃ under atmospheric pressure.Triangular phase diagrams were obtained by determining solubility and tie-line data.The non-random two liquids equation（NRTL） were used to predict the phase equilibrium in the system using the interaction parameters determined from experimental data.It is to see that the NRTL used for LLE can provide a good prediction.