(193b) Volumetric Properties of Carbon Dioxide + Ethyl Acetate Binary Fluid Mixtures At High Pressures

The volumetric properties of binary fluid mixtures at high pressures are of interest in many processes where supercritical or dense fluids are used as processing media. The addition of a second component to the primary process or processing fluid brings flexibilities to the process in terms of tuning the solubility of a compound of interest and the selectivity,  reactivity, recovery, and recycle of the solvent.  The mixtures of carbon dioxide with ethyl acetate are of importance in the pharmaceuticals, food and flavor industries.

In this presentation, we will be reporting new density data for ethyl acetate and its mixtures with carbon dioxide at pressures up to 30 MPa over a temperature range from 298 to 380 K. The data were generated for mixtures with carbon dioxide contents ranging from 27 to 67 % by mass. A novel measurement methodology was employed. The measurements were carried out at Virginia Tech in a variable-volume view-cell equipped with a computer-interfaced LVDT sensor which continuously monitors the position of the movable piston inside the cell. This provides real-time measurement of the internal volume of the cell as pressure is changed at a give temperature.  From the knowledge of the initial mass loading of the cell, near-continuous density-pressure curves are then generated. These curves are easily describable by smooth polynomial functions which are then used in evaluations of the isothermal compressibility, isobaric expansivity, thermal pressure coefficient, and the excess volume for a given mixture.