Abstract: In many industrial processes, the intelligent integration of chemical reactions and separation in one unit (reactive distillation) process was found to be superior to conventional reactor-separator sequences with respect to their economic properties and environmental compatibility. On the other hand, lactic acid is potentially an important raw material for biodegradable polymers and its recovery from aqueous solution is highly difficult. The lactic acid can be recovered by using reactive distillation. In this study, the lactic acid recovery was carried out by reactive distillation using n-butanol as reactive entrainer. The effect of initial concentration, mole ratio and catalyst weight on removal of water from aqueous lactic acid solution were studied and optimum values evaluated.