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The Extended Crossover Peng-Robinson Equation of State for Describing the Thermodynamic Properties of Pure Fluids

机译：描述纯流体热力学性质的扩展交叉彭-罗宾逊状态方程

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摘要

In this paper, a theoretical method has been introduced for developing the crossover Peng-Robinson (CPR) equation of state (EoS) which incorporates the non-classical scaling laws asymptotically near the critical point into a classical analytic equation further away from the critical point. The CPR EoS has been adopted to describe the thermodynamic properties of some pure fluids (normal alkanes from methane to n-butane and carbon dioxide) such as density, saturated pressure, isochoric heat capacity and speed of sound. Unlike the original method for the crossover transformation made by Chen et al. (Phys Rev A 42:4470-4484, 1990), we have proposed a procedure which adding an additional term into the crossover transformation to obtain the thermophysical properties at the critical point more exactly. It is shown that this new crossover method yields a satisfactory representation of the thermodynamic properties close to the critical point for pure fluids relative to the original PR EoS.
机译：本文介绍了一种理论方法，用于开发交叉彭-罗宾逊（CPR）状态方程（EoS），该方法将渐近临界点的非经典缩放定律渐近地纳入了远离临界点的经典解析方程。 CPR EoS已被用来描述某些纯流体（从甲烷到正丁烷和二氧化碳的普通烷烃）的热力学性质，例如密度，饱和压力，等速热容和声速。与Chen等人进行交叉转换的原始方法不同。 （Phys Rev A 42：4470-4484，1990），我们提出了一种在交叉转换中增加一个附加项以更精确地获得临界点的热物理性质的方法。结果表明，相对于原始的PR EoS，这种新的交叉方法可以令人满意地表示接近于纯流体临界点的热力学性质。

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