Abstract:

 The densities of CO2-ethanol, CO2-acetonc and CO2-n-heptane binary mixtures were measured at 308. 15 K and 318.15 K and under pressures ranging from 80 to 170 bar. The concentrations of the solutes (alcohol, acetone, and n-heptane) were form 0 to 1.3 mol•L-1. The partial molar volumes of the solutes at 318.15k were calculated based on the relationship between the densities of the mixtures and the concentrations of the solutes. It was observed that the partial molar volumes of all the three solutes are negative and the absolute value decreases with the pressure and the concentration of the solute.

Key words: Density, Carbon dioxide, Ethanol, Acetone, n-Heptane, Partial molar volume