Batch Type Vegetable Oil Refinery Plant, procedures are carried out in series of neutralizing, bleaching & deodorizing for a measured quantity of oils. Batch process is recommended for plants capacity as it is low cost and easy to operate. There are present different foreign impurities and unfiltered matter from the seed such as gums, mucilage, coloured & in crude oil extracted from expellers or solvent extraction plant. The free fatty acids (FFA) present in oil deteriorate the quality, thus, making its unfit for edible purpose.
The batch refining process consists of following section :
- Neutralizing / Degumming
- Bleaching Section
- Deodorizing Section.
First stage is neutralizing process in caustic soda treatment is performed to remove free fatty acids (FFA). For removing color from the oil, further processing is down in bleaching section under vacuum conditions using bleaching earth and activated carbon. High vacuum and temperature is also maintained for deodorizing and removing odor from oil. The quality of edible oil extracted from the batch refinery is good, in accordance with the international standard. Dewaxing is an added process carried out after bleaching, especially in case of sunflower and rice bran oil.
The equipment involved are Neutralizer, Bleacher, Deodorizer, Heat Exchanger, High & low vacuum equipment & Filters. Shreeji plant with batch process have been operating at number of places, processing variety of vegetable oils.