预测非理想多元混合物精馏点效率的新模型

A NEW MODEL FOR PREDICTING DISTILLATION POINT EFFICIENCIES OF NONIDEAL MULTICOMPONENT MIXTURES

提出一个新的计算非理想多元元精馏物系Murphree点效率的方法，在计算塔板上鼓泡液体中汽液两相间的传质通量时，充分考虑了在扩散路径上混合物组成的变化所产生的影响，同时根据多相湍流动力学的原理计算了鼓泡液体中汽、液相的接触面积．利用这个新模型对6个多元非理想混合物的计算，表明它能够准确地预测某些组元点效率的奇异性，而且预测的精度明显地优于现有其他方法，证明它是一个有效的、可靠的非理想多元精馏点效率预测方法.

A new method is presented in this paper for predicting the Murphree point efficiencies of nonideal multicomponent mixtures in distillation.In the method based on the film model,the interphase mass transfer in the bubbling liquid on the distillation tray is calculated in full consideration of highly nonlinear dependence of the transfer fluxes of individual component on mixture composition which changes along the diffusion path in the film.The interfacial area is calculated based on the principle of multiphase turbulence dynamics The calculation results for six multicomponent mixtures show that the new method can not only predict the bizarre point efficiencies of some species,but also give more accurate and reliable theoretical prediction than other existing methods.So the new model proves a better one for predicting the point efficiencies of the nonideal multicomponent distillation systems.