High Solubility and Partial Molar Volume of 2,2′-Oxybis(N,N-bis(2-methoxyethyl)acetamide) in Supercritical Carbon Dioxide

Abstract

2,2′-Oxybis(N,N-bis(2-methoxyethyl)acetamide) was synthesized and confirmed by IR, NMR, and elemental analysis. The solubility of this compound was measured at temperatures ranging from (313 to 333) K and pressures from (9.2 to 15.2) MPa in supercritical carbon dioxide. The synthesized compound showed high solubility in supercritical CO2 at easily accessible temperatures and pressures (e.g., 1.84 × 10−3 mol·L−1 at 9.2 MPa and 313 K). To confirm the tested solubility, the density-based correlations proposed by Bartle and Chrastil were investigated for the synthesized compound. The results showed good self-consistency of the data calculated using the Bartle semiempirical equation, which differed from the measured values by between (0.96 and 41.22) %. Better agreement with the experimental solubility data was obtained with the Chrastil model, for which average absolute relative deviations of less than 6 % were observed. The solubility data were also used to estimate the partial molar volume V2 for the compo...