用FRKS状态方程预测三元系超额体积

PREDICTION OF EXCESS VOLUMES OF TERMARY MIXTURES WITH FRKS EQUATION OF STATE

利用改进的立方状态方程—FRKS方程 ,并以二元互作用函数代替单一数值的二元互作用参数关联二元系的超额体积 ,得到二元参数 ,在不引入任何三元参数的情况下 ,直接用组分二元系作用函数的引入预测三元系的超额体积。对十二个三元系及其组分二元系的计算结果表明 ,二元互作用函数的引入明显提高了二元超额体积的拟合精度 。

The F function modified cubic equation of state-FRKS,coupled with the binary interaction function which was applied in place of single value of binary interaction parameter,was used to correlate excess volumes of binary mixtures.The termary excess volumes were predicted by using only binary interaction parameter and without introducing any ternary parameters.The results calculated in excess volumes for twelve ternaries and their constituent binaries show that by introducing binary interaction function,the correlation of binary excess volumes was markedly improved so that the ternary excess volumes can be predicted accurately.