Critical point data for carbon dioxide + hexane, + heptane, + octane, and + nonane were measured using a variable-volume view cell apparatus at mole fractions of carbon dioxide ranging from 0.974 to 0.834. Dew points and bubble points of the mixtures up to 395.7 K and 153.41 bar were measured by visual observation. The mixtures' critical points were determined by experimentally tracing the intersection point of the dew point and the bubble point loci on P − T projections.
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Choi et al. (1998) studied this question.