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Thermodynamics in Separation for the Ternary System 1,2-Ethanediol + 1,2-Propanediol + 2,3-Butanediol

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journal contribution
posted on 30.07.2014, 00:00 by Yang Zhong, Yanyang Wu, Jiawen Zhu, Kui Chen, Bin Wu, Lijun Ji
The thermodynamic data in distillation, i.e., isobaric vapor–liquid equilibrium data, have been measured for the three binary systems of 1,2-ethanediol + 1,2-propanediol, 1,2-ethanediol + 2,3-butanediol, and 1,2-propanediol + 2,3-butanediol at 101.3 kPa. The accuracy of the experimental data was confirmed by both Herington test and Van Ness test. The thermodynamic properties of the vapor phase have been calculated with the Hayden–O’Connell equation in consideration of nonideality. The liquid activity coefficients have been satisfactorily correlated with the Wilson, NRTL, and UNIQUAC models, while the estimated results from the UNIFAC model are not satisfactory. The corresponding binary interaction parameters of the three models Wilson, NRTL, and UNIQUAC were calculated and used to obtain the residual curves of the ternary system 1,2-ethanediol + 1,2-propanediol + 2,3-butanediol. Based on all of the preceding results, a two-column distillation process has been designed to obtain the required products.