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萃取-精馏法处理N,N-二甲基甲酰胺(DMF)废水是一种节能工艺,相关的工艺研究多有报道。为了对萃取传质过程进行研究,在机械搅拌萃取塔中采用氯仿萃取废水中DMF,在考虑萃取传质系数沿塔高变化的基础上建立了传质数学模型。根据实验数据,结合辛普森积分法和最优化方法—单纯形法对传质模型进行参数估计,获得传质系数与萃取轻重两相及搅拌桨转速的关联式为:KXa=0.0118N0.5068L0.4867S1.3907。结果表明:传质系数与轻重两相流量以及搅拌桨转速均呈正指数关系,重相流量对传质系数的影响较大,轻相流量的影响则较小。
Extraction - rectification of N, N-dimethyl formamide (DMF) wastewater is an energy-saving process, the relevant technology research has been reported. In order to study the process of extraction and mass transfer, chloroform was used to extract DMF from the wastewater in a mechanical agitated extraction column. A mass transfer mathematical model was established based on the change of mass transfer coefficient along the column height. Based on the experimental data and the Simpson integral method and the optimization method - simplex method, the parameters of the mass transfer model are estimated. The correlation between the mass transfer coefficient and the extraction of light and heavy two phases and impeller speed is: KXa = 0.0118N0.5068L0.4867S1 .3907. The results show that the mass transfer coefficient has a positive exponential relationship with the light and heavy two-phase flow rate and the propeller rotating speed. The heavy-phase flow has a greater influence on the mass transfer coefficient and the lighter-phase flow.