The influence of phenol, p-cresol, and 2,4-xylenol on the critical micelle concentration (CMC) in aqueous solutions of CTAB using tensiometry method at 25degreesC has been investigated. Decreasing of CMC in the presence of phenolic compounds, especially for most hydrofobic 2,4-xylenol was observed. The influence of CTAB concentrations on the water-phenol-toluene, water-p-cresol-toluene, and water -2,4-xylenol-toluene equilibria were presented. The greatest, reduction of the partition coefficient for water-2,4-xylenol-toluene extraction system has been confirmed.