Phase equilibrium data for ternary (carbon dioxide plus dichloromethane plus eugenol) and quaternary systems (carbon dioxide plus dichloromethane plus eugenol plus poly-epsilon-caprolactone)

摘要

Experimental phase equilibrium values for the ternary (carbon dioxide + dichloromethane + eugenol) and quaternary systems (carbon dioxide + dichloromethane + eugenol + poly-epsilon-caprolactone) have been determined in order to provide fundamental information to conduct microencapsulation of eugenol in supercritical carbon dioxide medium. The experiments were performed using a variable-volume view cell over the temperature range from (308.15 to 323.15) K. For the ternary system, three different values of mole ratios eugenol to dichloromethane (1:1, 1:5 and 1:10) were evaluated. Phase transitions of vapour-liquid type bubble point and vapour-liquid type dew point were observed at pressures between (0.73 and 12.43) MPa. Experimental results were modelled using the Peng-Robinson (PR) equation of state with the Wong-Sandler (PR-WS) mixing rule, providing a satisfactory representation of the experimental phase equilibrium data, with an average absolute deviation of 2.61 MPa. For the quaternary system two mole ratios of eugenol to poly-epsilon-caprolactone (PCL) to dicholoromethane (1:0.002:5 and 1:0.004:10) were adopted. For this system, only vapour-liquid phase transitions of the bubble point type were observed. It was observed that an increase in the temperature as well as in PCL concentration increased the transition pressures for these systems evaluated. (C) 2015 Elsevier Ltd. All rights reserved.