Organic pollutants were extracted from aqueous solutions into methyl isobuty ketone(MIBK) by membrane solvent extraction, using a microporous hydrophobic hollow fiber module. The system was operated countercurrently with the aqueous phase flowing through the fiber lumens and the solvent folwing through the shell side. The distribution coefficient of phenol was measured for solventes and MIBK was used as a extracting solvent. Concentrations and percent removal of organic pollutants in the exit phase from the HFM were studied.