Solubility, liquid–liquid equilibrium and critical states for the quaternary system acetic acid–ethanol–ethyl acetate–water at 293.15K

Abstract

a b s t r a c t Solubility, critical states and liquid-liquid equilibrium (LLE) data for the quaternary system acetic acid-ethanol-ethyl acetate-water and for the ternary sub-systems acetic acid-ethyl acetate-water and ethanol-ethyl acetate-water were obtained at 293.15 K and atmospheric pressure. Binodal curves, tielines and compositions of critical points were determined. In order to construct the binodal surface and critical curve of the quaternary system, three quaternary sectional planes with several ratios of acetic acid and ethanol were studied. Experimental LLE data were compared with the values calculated by UNIFAC model and it was found that the experimental and calculated data are in a good agreement.

Solubility, liquid–liquid equilibrium and critical states for the quaternary system acetic acid–ethanol–ethyl acetate–water at 303.15K and 313.15K

“…Generally UNIFAC model simulation leads to results that are in good agreement with experimental data. For the quaternary systems and both ternary subsystems, the standard deviation does not exceed 3.0% at 303.15 K and 5.5% at 313.15 K. These standard deviations are approximately the same as in our previous work on this system at 293.15 K (<3.1%) [29]. Table 10 The experimental data on compositions of critical states (mole fractions, x) for the system acetic acid (1)-ethanol (2)-ethyl acetate (3)-water (4) …”

“…As to be expected, the area of immiscibility in both ternary and quaternary systems increases in size with a decrease in temperature. These data can be compared with recent data on 293.15 K [29], when the immiscibility gap became even greater.…”

“…The operating procedure was the same as in our previous work. Details of the method had been published in paper [29]. Titration was performed in a liquid thermostat (303.15 and 313.15 K).…”

“…The experimental data on solubility (mole fractions, x) for the ternary system acetic acid (1) possible run of ethyl acetate hydrolysis reaction in ternary subsystems ethanol-ethyl acetate-water and acetic acid-ethyl acetate-water did not affect the composition of solutions [29]. Experimental data on the solubility of ternary subsystems ethanol-ethyl acetate-water and acetic acid-ethyl acetate-water at 303.15 K and 313.15 K are presented in Tables 2 and 3.…”

“…Previously, we presented experimental data on solubility, critical states, LLE and chemical equilibrium of esterification in this system at 293.15 K and atmospheric pressure; LLE data calculated by UNIFAC model were also reported in papers [29,30]. Our research concerns mostly solubility and LLE determination because the data sets on these properties are limited in comparison with VLE.…”