Modeling solubilities of sugars in alcohols based on original experimental data

Solubility of six different carbohydrates in methanol, ethanol, I-propanol, and 2-propanol were measured at 22, 30, and 40 degrees C. Ketose sugars (fructose, tagatose, and lactulose) show higher solubilities than aldoses (glucose, galactose, and lactose). The binary solid-liquid equilibrium data obtained was satisfactory represented by using the A-UNIFAC model. Additionally, the capability of the model to predict the carbohydrate solubility in alcohol-alcohol and alcohol-water mixed solvents was explored. (C) 2007 American Institute of Chemical Engineers.