A Review of Ternary Azeotropic Mixtures Advanced Separation Strategies

Abstract

In most multi component systems, the predominant non ideality occurs which lead to the occur rence of an azeotrope. The ternary systems classification and study are summarized in first part of this review. The next part covers thermodynamic knowledge of residue curve maps, univolatility and unidistribution curves. A feasibility criterion based on thermodynamic properties of ternary diagram is presented, they are considered as powerful tool for the flow sheet development and conceptual design. Separation of azeotropic mixtures and close boiling mixtures require non conventional distillation processes, among which the lead ing processes are pressure swing distillation if the composition of the azeotrope changes significantly with pressure, azeotropic distillation, extractive distillation, reactive distillation, and salt effect distillation. The final section provides an overview of concepts, history, and recent strategies in these non conventional distil lations.

Proportional-Integral Control and Model Predictive Control of Extractive Dividing-Wall Column Based on Temperature Differences

“…Extractive distillation (ED) is the predominant technology for the separation of liquid mixtures with azeotrope and/or low relative volatility in the chemical and pharmaceutical industries, which cannot be realized by the conventional distillation. 1,2 An additional entrainer (also known as solvent) is added to alter the relative volatility of liquid mixtures in ED, and two pure components can then be obtained at the top of two columns together with entrainer at the bottom of the second column. 3 However, the thermal efficiency of ED based on conventional two-column sequence is low at 5−20%.…”