Extraction of 1,3-propanediol from aqueous solutions using different ionic liquid-based aqueous two-phase systems

► Binodal curves for different ionic liquid-based aqueous two-phase systems were determined. ► Size of the miscibility gap depends on the polarity of the ionic liquid. ► Distribution coefficient of 1,3-propanediol in different ionic liquid-based aqueous two-phase systems were measured. ► Distribution coefficient depends on the polarity of the ionic liquid. ► Influence of the anion on the distribution coefficient is stronger than the influence of the cation.