Effect of the Power Series Dispersion Term on the Pressure−Volume Behavior of Statistical Associating Fluid Theory
Effect of the Power Series Dispersion Term on the Pressure−Volume Behavior of Statistical Associating Fluid Theory
复制标题
幂级数色散项对统计缔合流体理论压力-体积行为的影响
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
R. Heidemann
中科院分区：
文献类型：
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作者：
Naveen Koak and;T. W. Loos;R. Heidemann
结果表明，具有幂级数色散项的统计关联流体理论（SAFT）状态方程在一定压力和温度下可以有多个体积根。考虑的例子是基于已发表的非缔合纯组分甲烷和聚（乙烯-丙烯）790 （PEP790）的相关性。已经发现了五个体积根中的两个（一个机械稳定的和一个不稳定的）发生在比理论紧密堆积更小的密度下的条件，并且状态方程在名义紧密堆积状态下具有很大的负压。SAFT流体可以在最小体积根处具有最小的化学势，这在甲烷和PEP790行为的相关性中似乎没有被考虑到。
It is shown that the statistical associating fluid theory (SAFT) equation of state with the power series dispersion term can have multiple volume roots at a specified pressure and temperature. Examples considered are based on published correlations for the nonassociating pure components methane and poly(ethylene−propylene) 790 (PEP790). Conditions have been found where two of the five volume roots (one mechanically stable and one unstable) occur at reduced densities greater than theoretical close packing and the equation of state has a large negative pressure in the nominal close-packed state. The SAFT fluid can have the least chemical potential at the smallest volume root, which appears not to have been considered in the correlation of the methane and PEP790 behavior.