Salt effects on liquid-liquid equilibria in the ternary water/n-butanol/HMF system and solvent effects on HMF separation from water

• Published in: Journal of molecular liquids 2021-03, Vol.325, p.114551, Article 114551
• Main Authors: Grundl, G., Müller, R., Kunz, W.
• Format: Article
• Language: English
• Subjects: 5-Hydroxymethylfurfural; Distribution ratio; Highly concentrated LiCl solution; Liquid-liquid equilibrium; Salt effects; Separation factor
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2020.114551

Experimental liquid-liquid equilibrium data of the ternary system composed of water, n-butanol and 5-hydroxymethylfurfural (HMF) as well as of quaternary systems containing water, n-butanol, HMF and salts are presented at 298.15 K and 1 bar. Salt effects of KCl, Na2SO4, Al2(SO4)3, NH4NO3, CH3COONa, C2H5COONa and C3H7COONa were studied. The quaternary system water/n-butanol/HMF/Na2SO4 was also investigated at 303.15 K due to the maximum Na2SO4 solubility in water near this temperature. HMF distribution ratios (Dw(HMF)) and HMF separation factors (αw(HMF,water)) were the parameters used to evaluate the salting-out effects on HMF and the extraction selectivity. The association behaviour of HMF in binary water/HMF and ternary water/HMF/LiCl mixtures was studied by means of DLS. The influence of different extractive solvents on the HMF distribution behaviour and on the HMF extraction selectivity was evaluated using corresponding LLE data from literature. •Ternary and quaternary LLE composed of water, n-butanol, HMF and salt•Salt effects on the HMF distribution and selectivity•Salt effect of LiCl at high concentration on the HMF distribution•Influence of solvents on the HMF distribution and selectivity