In the pressing section the palm fruit / palm kernel enters into screw oil press/expeller to press because it yields the CPO (Crude Palm Oil). To get refined palm oil, we should get the process palm oil refining.
Crude palm oil refining steps:
Degumming: The CPO is heated under vacuum,and phosphoric acid is added to separate the gums,which are impurities that will be removed in the bleaching stages
Bleaching: We then add bleaching earth(activated clay) to adsorb all colour pigments in the oil
Filtration: The oil is send for filtration ti remove the bleaching earth. At this point, we will have bleached palm oil
Deodorisation: Next, remove odour and FFA from the bleached palm oil through deodorisation. The oil is heated and the vapour, which is also known as palm fatty acid distillate(PFAD), is remove from the oil. The oil is now known as Refined Bleached Deodorised Palm Oil(RBDPO)
Fractionation: Some of the RBDPO is sold to customers who use it as industrial frying fat. The bulk of it now undergoes fractionation where the oil is gradually cooled and passed through membrane filters