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Fragments of the phase diagram of the H 2 O-2 C 4 H 9 OH-NaCl system were studied experimen tally at 298 and 313 K. The thermodynamic properties of sodium chloride in three component solutions with ionic strengths up to 1.9 mol/kg and alcohol content in the solvent 4.97 and 10 wt % were measured at 298 and 323 K by the electromotive force method with ion selective electrodes. The eNRTL (electrolyte Non Random Two Liquids) model parameters correctly describing the results of electrochemical measurements of the partial properties of NaCl and phase equilibria in the water-2 butanol-sodium chloride ternary sys tem and binary subsystems constituting it were determined. The isothermal sections of the phase diagram of the H 2 O-2 C 4 H 9 OH-NaCl system were calculated using the method of convex hulls implemented in the TernAPI package.