Specially for palm oil refinery, fractionation process is required in which palm olein and palm stearin are separated by scientifically cooling the refined palm oil by chilling plant and then filtering the oil. For this purpose crystallizing vessel is used in which chilling pipe coils cool the oil for fractionation. Palm stearin crystals are formed due to chilling which are separated in Specially Designed Fully Automatic Membrane Chamber Filter Press and pure liquid of palm olene is obtained and palm stearin cake is retained in the Membrane filter press.