Abstract
A phase equilibrium apparatus was designed to determine the solubilities of stearic acid and palmitic acid in subcritical water at different temperatures and pressures. The dissolution equilibrium time was measured. The effect of an ultrasonic field on dissolution equilibrium was also studied. The results showed that the maximum solubilities of stearic acid and palmitic acid were 0.136g/100g and 0.178g/100g in subcritical water at temperatures of 180°C and 160°C, respectively, and a pressure of 15MPa for 30min. An ultrasonic field also clearly promoted the dissolution of fatty acids in subcritical water. The dissolution equilibrium time was shortened to 20min using ultrasonic oscillation (250W, 20kHz).
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