Journal of Supercritical Fluids, Vol.119, 52-57, 2017
Quaternary solubility of acetic acid, diacetin and triacetin in supercritical carbon dioxide
By a continuous-flow apparatus, quaternary solubility of acetic acid, diacetin, and triacetin in supercritical CO2 was measured at constant flow rate of 180 mL min(-1) and temperatures of 313 K, 333 K and 348 K in a pressure range of 70-180 bar. Acetic acid had the highest solubility in scCO(2). The binary solubility of acetic acid was also investigated at temperature of 333 k in the pressure range of 70-180 bar. With going from binary to quaternary, acetic acid solubility decreased in the range of 85-90% at different pressures. The quaternary solubility of acetic acid was decreased in the presence of diacetin and triacetin, due to more effective hydrogen bonds with acetic acid and supercritical CO2. In addition, it was observed that the solubility of polar diacetin molecules in non-polar CO2 solvent increased by increasing temperature. (C) 2016 Published by Elsevier B.V.