The extraction of lactic acid with tri-n-octylamine (TOA) or tri-iso-octylamine (TIOA) dissolved in a mixture of dodecane and a different alcohol was investigated under various experimental conditions. The influence of extractant, modifier, and diluent concentrations on the overall and overall particular distribution coefficients was determined. The obtained results and the observed phenomena were discussed by taking into consideration the mechanism of extraction and the concentration of the interaction product in the aqueous phase.