Chapter 6, Problem 6.99P

Interpretation Introduction

Interpretation:

Shows that for simple fluids ${\alpha }_C\approx 5.8$ ; and for non-simple fluids, ${\alpha }_C$ increases with increasing molecular complexity. Comment on Lee/Kesler Correlations use for calculations of $P_r{}^{sat}$ are appropriate or not.

Concept Introduction:

According to Lee/Kesler correlations, for calculation of $P_r{}^{sat}$ the following equations are used:

  $\ln P_r{}^{sat}\left(T_r\right)=\ln P_r{}^0\left(T_r\right)+\omega \ln P_r{}^1\left(T_r\right)$

Where

  $\ln P_r{}^0\left(T_r\right)=5.92714-\frac{6.09648}{T_r}-1.28862\ln T_r+0.169347T_r{}^6$

And

  $\ln P_r{}^1\left(T_r\right)=15.2518-\frac{15.6875}{T_r}-13.4721\ln T_r+0.43577T_r{}^6$