Liquid–liquid equilibria provide
basic data and guidance
regarding the design, simulation, and development of an appropriate
solvent extraction process. In the current work, the data for the
liquid–liquid equilibrium (LLE) of water + cyclohexanone +
isophorone and water + cyclohexanone + mesityl oxide systems have
been measured at temperatures of 308.15–328.15 K and pressure
of 101.3 kPa. The empirical Bachman and Hand equations were utilized
to confirm the consistency of experimentally determined LLE data.
Meanwhile, the solute distribution ratio and separation parameter
were obtained from the experimental equilibrium data to evaluate the
extraction properties of the selected solvents. Additionally, a mathematical
regression of experimental tie-line compositions for all of the investigated
ternary mixtures was performed by means of the nonrandom two-liquid
and universal quasi-chemical activity coefficient models to acquire
corresponding optimized binary interaction parameters. The correlation
results were verified to be coincident with the experimental ones
and revealed that the above two thermodynamic models were of high-accuracy
and suitable to regress the tie-line compositions for the investigated
ternary systems.
In order to reduce the decomposition of DMM3, the DMM3 aqueous solution was separated by liquid‐liquid extraction. Liquid‐liquid equilibria (LLE) data for three ternary systems of water + DMM3 + p‐xylene, water + DMM3 + toluene, and water + DMM3 + n‐heptane were measured under atmospheric pressure at 303.15 K and 313.15 K. The results indicated that p‐xylene, toluene, and n‐heptane showed excellent extraction ability for separating DMM3 aqueous solution. Moreover, the LLE data were correlated by NRTL and UNIQUAC models with good agreement.
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