## Compressibility charts for gases with different acentric factors and evaluation of the Redlich-Kwong-Soave equation of state

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Compressibility charts for gases with different acentric factors and evaluation of the Redlich-Kwong-Soave equation of state
(EN)

Kouremenos, DA
(EN)

Antonopoulos, KA
(EN)

N/A
(EN)

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 omega. Such charts are provided for various values of omega in the range omega = 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 omega = 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 p(r) < 1, the relative ercompressibility factor z is less than about 1%. For reduced pressures and temperatures in the ranges 1 less-than-or-equal-to p(r) less-than-or-equal-to 8 and 1 less-than-or-equal-to T(r) less-than-or-equal-to 3.5, respectively, it is found e less-than-or-equal-to 1% at the higher values of T(r), e less-than-or-equal-to 5% at the intermediate T(r) and e less-than-or-equal-to 10% at the lower T(r). The highest disagreement is observed near the critical point (p(r) = T(r) = 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 omega = 0.
(EN)

journalArticle

Equations of State--Gases
(EN)

Acentric Factor
(EN)

Gases
(EN)

Equation of State
(EN)

Compressibility Charts
(EN)

Critical Point
(EN)

Nomograms--Compressibility
(EN)

Real Gases
(EN)

Εθνικό Μετσόβιο Πολυτεχνείο
(EL)

National Technical University of Athens
(EN)

Forschung im Ingenieurwesen
(EN)

1991

Springer-Verlag
(EN)

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