Isobaric Vapor-Liquid-Liquid Equilibria for 1-Butanol + Water + 2,3-Butanediol at 101.3 kPa

Abstract

Vapor-liquid-liquid equilibria (VLLE) data were determined for the ternary system 1-butanol þ water þ 2,3-butanediol at 101.3 kPa. A binary heterogeneous minimum boiling azeotrope was found at 365.95 K with mass fractions of 0.526 and 0.474 for 1-butanol and water, respectively. A modified UNIQUAC model was used to predict VLLE by using experimental data, including VLE of 1-butanol þ 2,3-butanediol, VLE of water þ 2,3-butanediol, LLE of 1-butanol þ water, and one LLE tie-line of 1-butanol þ water þ 2,3-butanediol. The experimental data were compared with the calculated values. The absolute average relative deviations (AARD) are 1.65%, 1.72%, and 2.22% for organic liquid phase, aqueous liquid phase, and vapor phase, respectively. It demonstrates an appropriate fit of the modified UNIQUAC model.

Phase equilibria modeling of biorefinery-related systems: a systematic review

“…Liquid-liquid equilibria, as explained in section 6.1, included most of the articles reviewed in this work (146). For this reason, it was not possible to compare these studies directly and other strategies had to be adopted.…”