New CO2-philic Propane Derivatives: Design, Synthesis and Phase Behavior in Supercritical Carbon Dioxide

Three new potent CO2-philic propane derivatives were designed and synthesized. Their structures were characterized by NMR, FTIR, and elemental analysis. Phase behavior of the three compounds was investigated at temperatures ranging from 313 K to 333 K and pressures from 9.1 MPa to 16.1 MPa in supercritical carbon dioxide, the solubility differences were discussed. The experimental solubility data were calculated and correlated by the two density-based models: Bartle and Chrastil, and satisfied agreements were obtained. Additionally, the partial molar volumes V2 for each compound were also estimated in the supercritical phase using the theory developed by Kumar and Johnston.