Solubility of carbon dioxide in pentaerythritol tetraoctanoate

In this paper, solubility measurements of CO2 in pure pentaerythritol tetraoctanoate (PEC8) between 273 and 343 K are presented. The experiments were performed according to the static, synthetic method. The data are represented using the Peng-Robinson equation of state with the Huron-Vidal mixing rules and the UNIQUAC equation for the excess Gibbs Energy (gE) at infinite pressure. This system shows immiscibility in liquid phase, with lower critical end point (LCEP) at T = 268 ± 0.1 K and xCO2=0.98±0.001 and upper critical end point (UCEP) at the critical point of pure CO2.