Abstract
ABSTRACT A new simple two-constant cubic equations of state for hydrocarbons, hydrocarbon mixtures, and other non-associating compounds is introduced. This equation of state is based on the statistical mechanical information available for the repulsive thermodynamic functions and the phenomenological knowledge of the attractive intermolecular potential tail contributions to the thermodynamic properties. This new two-constant-parameter cubic equation is in the following form: Zm=PvRT=v+1.3191ℓmv-ℓm−(∑i∑jaij)/RTT1/2(v+∑iℓi) where lm=1/43∑i∑jxixjlij+∑ixilii,, lij=lii1/3+ljj1/33/8; aij=1−kijaii ajj1/2 and aii=0.48748 R2Tcii5/2/Pcii and ℓii = 0.064662 RTcii/Pcii It is shown that this equation of state is more accurate than the Redlich-Kwong equation, which has been considered to be the best two-constant-parameter cubic equation of state. This new equation is applied for calculation of thermodynamic properties of hydrocarbons and other non-associating fluids and fluid mixtures of interest in the oil and gas industries.
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