In current study, ternary phase equilibria of (water + n-butyric acid + 2-methylcyclohexanol) were considered. Experimental tie-line data were measured at T = 298.2, 308.5 and 318.2 K and 102.1 kPa. Type I LLE behavior was observed for the studied mixtures. Karl-Fischer and acid-base titrations were applied to analyze separated phases. The Hand and Othmer-Tobias equations were used to test the validity of obtained tie-line data. Regression coefficients of both equations were bigger than 0.99. Calculated separation factors (14.6 to 32.6) and distribution coefficients (1.5 to 4.8) proved that the studied solvent is very efficient for extraction of n-butyric acid from water. Thermodynamic modeling was performed by NRTL equation and root mean square deviations (3.54 to 4.11 %) were calculated to investigate the quality of modeling.