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Estimation of critical data by equation of state
Author(s) -
Schmidt G.,
Wenzel H.
Publication year - 1981
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450590421
Subject(s) - acentric factor , equation of state , thermodynamics , cover (algebra) , reduced properties , boiling point , chemistry , mathematics , materials science , physics , mechanical engineering , engineering
Abstract A recently proposed cubic equation of state was used to predict critical temperature T c and pressure p c from liquid density at room temperature and from boiling temperatures generally at 13 kPa and 100 kPa. Calculated and experimental critical data are compared for some 270 substances. For non‐associating substances the values were generally found to be in close agreement. The method was then used to produce values of T c , p c as well as acentric factors ω for nearly 1700 compounds. Comparative calculations were performed with Soave's as well as Peng and Robinson's equations and showed that application of these equations is restricted. Examples are given to show that the method may be extended to cover associating substances.