一种新的WS型混合法则

立方形状态方程被广泛应用于相平衡计算中．绝大多数状态方程是结合简单的van der Waals混合法则来进行VLE数据关联的．然而对于应用这些方程关联高度非理想混合物的复杂的相行为，仅用van der waals单维流体混合法则是不够的．甚至在van der Waals混合法则引入另外一个参数都不能够精确地关联含有极性物质的混合物．

NEW WONG-SANDLER-TYPE MIXING RULE

Some successful vapor-liquid equilibrium(VLE) mixing rules based on excess free energy models proposed in recent years combines the advantages owned partially by equations of state and activity coefficient models to obtain the better prediction for nonpolar and polar systems.The paper coupled with the merits of MHV1 mixing rule, LCVM mixing rule and WS mixing rule to put forward the new two-parameter mixing rule which satisfies the second viral coefficient boundary condition.The new mixing rule, coupled with the PR equation of state and the NRTL model is tested against 18 kinds of vapor-liquid equilibrium data of nonpolar, nonpolar-polar/polar-nonpolar,and polar-polar systems.The test results indicate that the new model can yield better prediction.Compared to the other two mixing rules (WS,MHV1), the new model shows better VLE prediction capabilities of binary mixtures.