The compositional equation of state formulations by Coats (C), Nghiem, Fong, and Aziz (NFA), and Young and Stephenson (YS) are compared for both immiscible (IM) and multiple contact miscible (MCM) problems. Coats' formulation has the largest computer memory requirements and computation times. Nghiem, Fong, and Aziz's formulation requires the least memory, and Young and Stephenson's formulation is generally the fastest.

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