Bubble point of aqueous mixtures of sugar-based deep eutectic solvents and their individual components: Experimental study and modeling

Abstract

The bubble pressure of aqueous solutions of two natural deep eutectic solvents (DESs) was measured at temperatures 303.15 K–343.15 K and different concentration of the DESs. DESs were formed with combining choline chloride and a sugar (glucose or fructose) in a choline chloride: sugar molar ratio of 2:1. In addition, the bubble pressure of aqueous solutions of fructose, glucose, and choline chloride, were measured to define the impact of the individual components of the DESs on the bubble pressure. According to the results, choline chloride had the greatest effect and sugars had the least effect on the bubble pressure. Experimental bubble point data was used to estimate the binary interaction parameters of the NRTL activity model. An overall AARD of 1.91% indicates the good accuracy of the model in estimating the bubble pressure of aqueous solutions studied in this work. To verify the calculated binary interaction parameters, the NRTL model was used to estimate the solubility of glucose and fructose in water and the results were compared with the experimental solubility available in the literature.