High-Pressure Bubble- and Dew-Point Data for Systems Containing CO2 + (C8/C10 1-Alcohol with C12/C14/C16 Methyl Ester) Systems

Abstract

Six new high-pressure bubble- and dew-point data sets have been generated for ternary systems containing carbon dioxide (C₈ or C₁₀ 1-alcohols) and (C₁₂ or C₁₄ or C₁₆ methyl esters). These data were measured at a fixed reduced solute mass fraction of 0.5000 between a total solute mass fraction of 0.020 to 0.640 at temperatures between 308.15 and 358.15 K. The CO₂ + 1-octanol + methyl tetradecanoate/methyl hexadecanoate and CO₂ + 1-decanol + methyl hexadecanoate systems were shown to be cosolvent due to preferential interactions between like molecules. In comparison to the CO₂ + 1-alcohol + n-alkane ternary systems, the CO₂ + 1-alcohol + methyl ester ternary systems are consistently less cosolvent, indicating that cross-association potentially occurs between the 1-alcohol and methyl ester molecules, decreasing the solubility enhancement that is expected due to the disruption of the hydrogen bonding between neighboring 1-alcohols by the methyl ester. The RK-Aspen model is shown to provide an adequate description of the measured phase behavior data including only solute + solvent binary interaction parameters.