Liquid-Liquid Equilibria for the Binary Systems (Water + Di-n-butyl Phthalate),(Water + Di-ethyl Phthalate),and (Water + Di-isobutyl Hexahydrophthalate) from (298.2 to 348.2) K

摘要

Liquid-liquid equilibrium data for the binary systems water + di-n-butyl phthalate,water + di-ethyl phthalate,and water + di-isobutyl hexahydrophthalate in the temperature range of (298.2 to 348.2) K at normal pressure were determined.The organic compound concentrations in the aqueous phase were measured by the high-performance liquid chromatograph,while the water concentrations in the organic phase were measured by the Karl Fischer equipment.The NRTL and UNIQUAC models,of which the interaction parameters were expressed as a function of the temperature from (298.2 to 348.2) K,were used to correlate the obtained liquid-liquid equilibrium data.The results show that the correlation accuracy of the UNIQUAC model is better than the NRTL model at the studied temperatures.