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In this study,the LLE data of tary system(water+1,6-diaminohexane+2-methyl-1-propanol)and(water+1,6-diaminohexane+3-methyl-1-butanol)were measured at 293.15,303.15 and 313.15 K under atmospheric pressure.Reliability of the experimental tie-line data was checked by empirical Hand,Othmer-Tobias and Bachman equations.Distribution coefficient(D)and selectivity(S)were calculated in order to investigate capa-bility of the studied organic solvents for 1,6-diaminohexane extraction.The high values of separation factors demonstrated that 2-methyl-1-propanol and 3-methyl-1-butanol were applicable for this purpose.The experi-mental data were correlated by nonrandom two-liquid(NRTL)and universal quasi-chemical(UNIQUAC)models.The percent-root-mean-square deviation(RMSD)values for NRTL and UNIQUAC models were less than 0.15,which indicated that the experimental data have been sufficiently correlated.