Abstract
The Redlich-Kwong-Soave generalized equation of state is transformed into a dimensionless form, which permits plotting of one compressibility chart for each value of the acentric factor ω. Such charts are provided for various values of ω in the range ω=0–0.6. A systematic evaluation of the Redlich-Kwong-Soave equation is made by comparison with the latest version of the generalized compressibility chart given by Nelson and Obert. It is found that for ω=0, the Redlich-Kwong-Soave compressibility chart agrees well with the Nelson-Obert chart, apart from a small region near the critical point: For values of the reduced pressure pr<1, the relative ercompressibility factor z is less than about 1%. For reduced pressures and temperatures in the ranges 1≤pr≤8 and 1≤Tr≤3.5, respectively, it is found e≤1% at the higher values of Tr, e≤5% at the intermediate Tr and e≤10% at the lower Tr. The highest disagreement is observed near the critical point (pr=Tr=1). Moreover, the exact compressibility chart of the real air is developed, based on its exact equation of state, and compared with the Redlich-Kwong-Soave compressibility chart for ω=0.
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