1.Deacidfication:To purify the oil and remove the waste in the oil first time.
2.Degumming:To purify the oil and remove the waste in the oil again to make the oil more clean.
3.Bleaching and filtering:To make the purified oil reach good quality oil and meet people's edibe need.
4.Deodorization:To remove the bad smelling of the oil and to make the oil better and have no smelling.