Distribution coefficient of beta-carotene in systems composed of cyclohexane, water, and 2-propanone and methylcyclohexane, water, and 2-propanone

The distribution coefficient of beta-carotene between water and a mixed org anic solvent was measured at T = 298.15 K. Binary solvent systems formed by 2-propanone with either cyclohexane or methylcyclohexane were used as the mixed solvent. The liquid-liquid equilibria, along with the tie lines, were determined for two ternary aqueous systems, viz., cyclohexane + water + 2- propanone and methylcyclohexane + water + 2-propanone. The systems exhibit a parabolic type miscibility gap. The coexistence curves were measured by t he titration method, and results were smoothed by means of either three- or four-parameter equations.