应用低压下饱和液体PVT数据推算临界参数

A NEW METHOD OF ESTIMATING CRITICAL PARAMETERS FOR PURE SUBSTANCES

应用低压下饱和液体ＰＶＴ数据推算临界参数童景山，高光华，李军，何峻（清华大学化学工程系北京１０００８４）关键词：临界参数推算法，饱和液体ＰＶＴ数据，低压一、前言纯物质的临界参数（Ｐｃ，Ｖｃ；Ｔｉ）在关联和予测物质的一系列热物性数据中得到广泛应用。临界...

In this paper, a new method of estimating critical parameters (PC, Vc,Tc) for pure substances is presented based on saturated liquid PVTdata under low pressures. To prove the accuracy of this method the critical parameters of fifty substances(including strongly polar and associated compounds, such as ammonia, methanol, ethanol, etc) were calculated and compared with experimental data. The calculated results show that the new method is fairly fitted in the experimental data with the percentage average absolute deviation (AAD%) 0.64%(Tc), 0.92%(Pc) and 0.96%(Vc) respectively in the investigated range.