用FRKS状态方程关联高度非对称二元系超额焓

引言对于组分分子大小、形状、结构相差较大的高度非对称混合物，迄今仍未有计算其超额焓的满意的方法．最近Lin等用转子链立方状态方程计算了高度非对称二元系的超额焓．在他们的工作中，使用两个可调参数虽然明显改进了计算，但对大多数体系，误差仍较大．对于这一类体系，立方状态方程失败的两个主要原因是：一、对于纯物质，立方状态方程中的引力参数α通常表为温度T和偏心因子ω的函数．对于复杂化合物，特别是长链碳氢化合物，由于其性质偏离正常流体较远，偏心因子已不可靠，另外，对于高沸点物质，也难以得到可靠的ω数值；因此，…

CORRELATION OF EXCESS ENTHALPIES OF HIGHLY ASYMMETRIC BINARY SYSTEMS WITH FRKS EQUATION OF STATE

The approach recently proposed by Liu and Qu was extended to correlate excess enthalpies of highly asymmetric binary systems.In this approach,FRKS equation of state was used, and L_(ij)(T,x)function was applied in place of single value of the binary interaction parameter L_(ij).Twenty four binary systems,including benzene -（C_(11)～C_(17)）lakane,benzene -methyl naphthalene,xylene-(C_3～C_8)al-cohol,l-Hepetanol-(C_6～C_9)alkane,methanol,ethanol-chlorobenzene,were selected to do the test.For most of these binary systems, no equation of state method has been found accurate.The results obtained show that this method can improve significantly the correlation of excess enthalpies for highly asymmetric binary systems.The calculated excess enthalpies for most of the selected systems are in good agreement with experimental data.