The crude oil is pumped to the Neutralizer from the storage tank. In Neutralizer the oil is heated up to 60-700C by means of the live and indirect steam provided in to the Neutralizer. The required quantity of Phosphoric acid is slowly added and allow this to react for 30 mins and after that raise, the temperature to 70 degrees centigrade, the required amount of caustic is added to neutralize the free fatty acid. Allow this to react for 10 mins and give a hot water wash, to allow the soap stock to settle. After 4-6 hours, soap stock is drained off. After removing soap stock give a hot water wash to remove the traces of Soap.