Neutralization is the process of removing free fatty acids from crude oils by using Alkaline . The indicated concentration of Caustic lye was add to the prepared oil sample to neutralize the free fatty acids and the desired concentration of additional amount of Alkaline was infused to ensure the complete formation of soaps. This was proceeded with agitation at 70-80°C originally, and once the KOH was added, the temperature was increased to the indicated temperature immediately, maintaining the temperature for the desired time. Then the soaps were separated by centrifugation at 5400 r/min approximately To remove the traces of soaps dissolved in the treated oil and the remains of the basic reagents added, the oils obtained in the previous stages were washed with three successive additions of 10% of 90-96°C pure water. Then removing the washing water by centrifuging and the neutralized oil was obtained. After addition of alkaline solutions, soap is formed in the oil and removed by washing with hot water. Then, the oil is dried in order to remove the remaining water in the neutralized oil.