First process is neutralizing the oil in the neutralizer to remove the Free Fatty Acids (FFA) by adding caustic soda. Then soap stock formed due to chemical reaction is separated from the oil in centrifuge.
Neutralized oil is drawn into the second vessel called bleacher where colour of oil is removed by bleaching process with aid of clay or chemicals such as carbon black and bleaching earth. Oil is generally heated up to 110°C by
