There are three basic processes in the refinery:
Neutralizing of the oil
Oil is heated, oil is stirred and soap stock is taken out into soap pan.
Oil is generally heated up to 110C by thermic fluid coils. Stirring is also continued. Bleaching process is done under vacuum.
The filter press
The oil is then cooled. Again it goes to second filter press where completely refines and transparent color less oil is obtained.