Crossover SAFT Equation of State: Application for Normal Alkanes
Crossover SAFT Equation of State: Application for Normal Alkanes
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DOI：
10.1021/ie990387i
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发表时间：
1999-10
影响因子：
4.2
通讯作者：
S. B. Kiselev;J. Ely
中科院分区：
文献类型：
--
作者：
S. B. Kiselev;J. Ely
本文对大分子链流体的统计关联流体理论（SAFT）状态方程进行了交叉修正，引入了渐近于临界点的标度律，并将其转化为远离临界点的原始经典SAFT状态方程。并与纯甲烷、乙烷、正己烷、正癸烷和正廿烷在一相和两相区域的实验数据进行了比较。我们还比较了正三康烷和正四康烷的实验单相数据。我们表明，在广泛的状态范围内，交叉SAFT模型比原始SAFT状态方程能更好地表示纯流体的热力学性质。交叉SAFT状态方程再现了从三相点到临界温度整个温度范围内的饱和压力数据，平均绝对偏差（AAD）约为3.8%，饱和液体密度随温度的变化而变化。
In this paper we develop a crossover modification of the statistical associating fluid theory (SAFT) equation of state for macromolecular chain fluids which incorporates the scaling laws asymptotically close to the critical point and is transformed into the original classical SAFT equation of state far away from the critical point. A comparison is made with experimental data for pure methane, ethane, n-hexane, n-decane, and n-eicosane in the one- and two-phase regions. We also present comparisons with experimental single-phase data for n-triacontane and n-tetracontane. We show that, over a wide range of states, the crossover SAFT model yields a much better representation of the thermodynamic properties of pure fluids than the original SAFT equation of state. The crossover SAFT equation of state reproduces the saturated pressure data in the entire temperature range from the triple point to the critical temperature with an average absolute deviation (AAD) of about 3.8%, the saturated liquid densities with a...