Abstract
A previously proposed equation of state incorporating association (AEOS) has been modified to extend its applicability to aqueous systems. The equation consists of two terms: a chemical one based on a generalized association model and a physical one which is equivalent to an equation of state for a monomeric fluid and is represented by a cubic equation of state for nonpolar compounds. The assumptions that are necessary to separate these terms have been discussed. The equation is able to present simultaneously vapor—liquid and liquid—liquid equilibria in aqueous hydrocarbon mixtures with only one adjustable binary parameter. A well-defined linear temperature dependence of the binary parameter makes it possible to reproduce VLE and LLE over large temperature and pressure intervals with good accuracy.
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