Vapor-Liquid Equilibrium Behaviors of 5-Hydroxymethylfurfural and Citric Acid

Abstract

Vapor-liquid equilibrium behaviors of 5-hydroxymethylfurfural in methanol, ethanol, and water were measured at atmospheric pressure in the dilute composition range of 5-hydroxymethylfurfural with a recirculation still. Vapor-liquid equilibrium behaviors of citric acid in methanol and ethanol were further measured. Equilibrium compositions were determined with an ultraviolet spectrometer. The volatilities of 5-hydroxymethylfurfural at infinite dilution were determined to be 0.0020, 0.0026, and 0.012, respectively, in methanol, ethanol, and water. The volatilities of citric acid at infinite dilution were determined to be 0.0008 and 0.0012, respectively, in methanol and ethanol.