Solubilities and partial molar volumes of 1-methypropanedioate derivatives in supercritical carbon dioxide

In present study, five new CO2-philic 1-methypropanedioate derivatives containing nonfluorous alkyl groups had been designed and synthesized. The solubilities of these compounds in supercritical carbon dioxide (scCO(2)) were investigated with a static analytical method at the temperature from 323 K to 343 K and in the pressure range of 9.3-13.7 MPa. All compounds showed high solubilities in supercritical CO2 at easily accessible temperatures and pressures. To correlate the experimental data, two density-based models proposed by Bartle and Chrastil were investigated. The correlation results showed good self-consistency between the calculated and the measured values, which were in the range of 7.79-21.99% by Bartle model and 4.09-11.15% by Chrastil model. Additionally, according to the Kumar and Johnston theory, the partial molar volume (V) over bar (2) of each compound in scCO(2) was also calculated and the results were between -10788.4 and -1585.84. (c) 2012 Elsevier B.V. All rights reserved.