Measurement and correlation of vapor-liquid-liquid equilibria in the glucose + acetone + water + carbon dioxide system

Phase equilibria in the glucose + acetone + water + carbon dioxide system have been investigated experimentally in the three-phase region at temperatures of 313, 323, and 333 K and pressures of 4, 6, and 8 MPa. The experimental method was checked by measuring phase equilibria in the binary and ternary subsystems acetone + carbon dioxide and acetone + water + carbon dioxide and comparing the results with literature data. The experimental data for the quaternary system have been correlated using the Soave-Redlich-Kwong equation of state (EOS) with the mixing rule proposed by Mathias, Klotz and Prausnitz (1991). The binary interaction parameters for the binary subsystems without glucose have been regressed from phase equilibria of the binary subsystems, and the interaction parameters for glucose have been regressed from the glucose K-factors determined in the quaternary system investigated. With these interaction parameters the extent of the three-phase region can be well predicted and the partioning of glucose between the three phases can be reproduced.