Summary A semicontinuous thermodynamic description has been used to model the C7+ fraction for equation of state (EOS) calculations. This semicontinuous description may be used in existing discrete-component EOS programs by picking pseudocomponents in a rigorous a priori fashion dependent only on the properties of the C7+ fraction. Excellent representation of experimental PVT data considered here is obtained with only two C7+ pseudocomponents, although the theory and procedure extend to three or more components.
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Behrens et al. (1988) studied this question.
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