Rosmarinic acid has been separated by facilitatedpertraction with D2EHPA dissolved in dichloromethane. The per-traction has been carried out in presence of 1-octanol, added into the liquid membrane. The addition of the alcoholled to the increase for more than twice the rosmarinic acid initial and final mass flows, this effect being directlyrelated to the process variables (pH-gradient between the aqueous phases, carrier and alcohol concentrations insidethe membrane phase, mixing intensity). But, the influence of 1-octanol on the transport capacity of the pertractionsystem was negative, its addition inducing the accumulation of rosmarinic into the liquid membrane. Due to thiseffect, the reevaluation and optimization of the reextraction process from the membrane phase to the stripping arerequired.