Abstract
Experimental data are presented on the high-pressure phase behavior of 4-methoxyphenylacetic acid (4MPA) with carbon dioxide. High-pressure portions of vapor−liquid, pressure−composition (P−x) isotherms were measured at 68.2, 80.2, and 94.8 °C and portions of two solid−fluid isotherms were measured at 35.3 and 52.0 °C. The 4MPA + CO2 phase behavior is modeled with the Peng−Robinson equation of state with two mixture parameters fitted to the 80.2 °C P−x isotherm. A reasonable fit of the data is obtained if kij, the parameter that accounts for specific interactions, is permitted to decrease with decreasing temperature.
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