In batch oil refinery process or cooking oil refinery process, a measured quantity of oils is processed in sequence of neutralizing, bleaching & deodorizing.
Crude oil obtained from expellers or solvent extraction plant contains foreign impurities such as mucilage, gums, coloured & unfiltered proteinous matter from the seed. Also Free Fatty Acids (F.F.A.) which tend to deteriorate the oil on storage, thus making it unfit for edible purpose.
The batch refining process consists of following section