(329f) The Thermodynamics and Separation Process Design for the Ternary System 1,3-Propanediol+ 1,3-Butanediol + 2,3-Butanediol

The isobaric vapor-liquid equilibrium (VLE) data at 101.3kPa for (1,3-propanediol(PG) + 1,3-butanediol(BD)), (1,3-PG+2,3-BD) and (1,3-BD+2,3-BD) and for the ternary system of (1,3-PG+1,3-BD+2,3-BD) have been measured. The thermodynamic properties of the non-ideal vapor phase have been considered with the EOS equation. The liquid activity coefficients have been calculated with Wilson, NRTL and UNIQUAC equations, and the corresponding binary interaction parameters were regressed by these models. As for system (1,3-PG+1,3-BD+2,3-BD), the vapor composition of VLE data were calculated by the optimum parameter group and generated a good consistency with experimental values. The regressed parameters were used to calculate residue curves, which showing no azeotrope among the studied system. Based on all the preceding results, a two-column distillation process was designed and optimized, and then 95.0% 2,3-BD, 95.0% 1,3-PG and 80.0% 1,3-BD within the specifications for industrial requirement from bio-based mixture glycols were obtained.