High-Pressure Density of Eutectic Mixtures Containing dl-Menthol and Acetic Acid

The eutectic mixtures consist of dl-menthol and acetic acid were prepared at five molar ratios (3:1, 2:1, 1:1, 1:2, 1:3). The vibrating-tube densimeter was used to measure the density of the DL-menthol/acetic acid mixtures, and the measurements were carried out from 293.15 K to 363.15 K and pressures from 0.1 MPa to 70 MPa. The measured densities of each dl-menthol/acetic acid mixture at different temperature and pressure were correlated by the Tait equation. In addition, the derived properties of dl-menthol/acetic acid mixtures including isothermal compressibility, isobaric thermal expansivity, and internal pressure were calculated. The effects of temperature, pressure, and molar ratios on the derived properties were compared and analyzed.