7.3. Equations of State

An EOS defined as an analytical expression relates the thermodynamic variables including temperature T, the pressure P, and the volume V of the system. Finding an accurate PVT relationship for real hydrocarbon mixtures has great importance for calculating petroleum reservoir fluid phase behavior and consequently estimating the performance of surface production and separation amenities. Generally, most EOSs need only the acentric factor and the critical properties of pure substances. The major benefit of employing an EOS is that a similar equation can be employed to demonstrate the phase behavior of other phases, thus confirming reliability when implementing phase-equilibrium computations.
The ideal gas equation, which is ...

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