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New experimental data on the chemical equilibrium in the propionic acid - ethanol - ethyl propionate - water system at 293.15 K and atmospheric pressure are presented. Chemically equilibrium compositions corresponding to the liquid-liquid equilibrium were obtained by gas chromatographic analysis. Using the method of nuclear magnetic resonance, homogeneous chemically equilibrium compositions were determined and the concentration equilibrium constant is calculated. The surface of chemical equilibrium and the region of splitting chemically equilibrium compositions are represented in the square of the transformed concentration variables. Comparison of the data obtained in the work with the literature was carried out at 303.15 and 313.15 K. It was found that the region of such compositions decreases with increasing temperature, while the surface of chemical equilibrium does not change the shape and position in the concentration space in the temperature range 293.15-313.15 K and atmospheric pressure. Liquid-liquid equilibrium compositions have also been obtained by gas chromatographic analysis for ethanol and ethyl propionate in the pseudo-ternary system using deep eutectic solvents (DES) based on choline chloride and glycerol / urea in whole range of concentration. The analysis of the extraction properties of DES showed the highest efficiency of DES based on choline chloride and urea. Experimental data on phase equilibrium are processed using Othmer-Tobias and Hand models. The calculated correlation coefficient (more than 0.99) indicates a high internal consistency of the experimental data obtained in this work.

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Liquid−liquid equilibrium (LLE) and solubility for the quaternary acetic acid−n-propyl alcohol−n-propyl acetate−water were carried out at 323.15 and 333.15 K (atmospheric pressure). A brief review of literature data is provided. The compositions of LLE were determined by gas chromatography analysis. Solubility data and critical points were obtained by the "cloud-point" technique method. The obtained data gave an opportunity to present the disposition of the critical curve formed by critical points and binodal surface in a regular composition tetrahedron. A set of critical curves led to a critical polythermal surface in the 3D concentration space. A detailed graphical analysis of data comparison is presented for binary and ternary subsystems. LLE modeling using the NRTL model shows that calculated data are in good agreement with the experimental results.