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Selection of Solvent for Extractive Distillation Using a ModifiedGroup Contribution Method

Hua Chao, Xingang Li, YU Guo-cong

Abstract

Based on the group contribution method for selecting solvent for extractive distillation, the atmospheric VLE of eight binary azeotropic mixtures with the corresponding solvent were measured. The solvent selectivity was well studied and the effect of solvent mass ratio on separation efficiency was also discussed. The experimental data were correlated with the modified UNIFAC model and the rms deviation of experimental data from calculated values was less than 5.0%. Compared with other methods of selecting solvent for extractive distillation, the method proposed in this paper has more advantages such as rapidity, high efficiency and accuracy in practical application.

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Available abstract

Key concepts: Extractive distillation, Solvent, Distillation, Azeotropic distillation, UNIFAC, Chemistry, Fractional distillation, Selectivity