First process is neutralising the oil is neutralised to remove free fatty acids (FFA) by a addition of caustic soda. Then oil is heated upto about 60˚c by thermic fluid coils or close loop steam circulation and oil is stirred by stirrer. Then soap stock is formed due to chemical reaction of acid with alkali. The formed soap is allowed to settle at the bottom of the neutraliser from where it is taken out into soap pan otherwise it send to centrifuge separator for spliting it instantly then the process is followed by refining and washing.