DENSITIES OF LIQUID AND SUPERCRITICAL MIXTURES OF METHYL MYRISTATE AND CARBON-DIOXIDE AT HIGH-PRESSURES

Densities of liquid mixtures of methyl myristate (tetradecanoic acid m ethyl ester: CH3OOC(CH2)(12)CH3, here abbreviated as MM) and carbon di oxide (CO2) were measured at temperatures of 40 degrees C, 50 degrees C, and 60 degrees C and pressures of 1 bar to 170 bar for compositions from pure MM to the saturated MM + CO2 liquid phase. Some mixtures we re compressed above their critical point. The accuracy of the measurem ents is estimated to be +/-0.3 kg/m(3) for density, +/-0.1 bar for pre ssure, and +/-0.1 K for temperature. Even at high mole fractions of ca rbon dioxide, the densities showed liquidlike behavior. At constant co mposition and constant temperature, the density of the mixture increas es linearly with pressure. At higher mole fractions of carbon dioxide, the slope of these linear functions increases significantly. Together with already published equilibrium-compositon data, the results allow an online determination of liquid-phase compositions from measured de nsity, pressure, and temperature.