Why should refining the soybean oil?
Soybean oil refining is very important process in the
soybean oil production line, it refers to remove the harmful impurity from the crude soybean oil,such as FFA( Free Fatty Acid), but not only the FFA, it also removes the unwanted impurities, color and odor which may have a negative impact on the taste, odor, and appearance of the oil. The soybean oil after refining process is thinner without FFA, colorless and odorless, and also,it is good for human health and easy to storage.
Crude soybean oil--degumming--deacidification(Alkali refining)--decoloration--deodorization--refined soybean oil
1. Degumming and deacidification refining
A. Crude oil is delivered to heater after filtering impurities, and then goes to mixer when reach certain temperature.
B. After mixing at high speed, crude oil will go inside hydrated reaction tank and then go to first self-cleaning centrifuge to separate soapstock.
C. Separated heavy oil goes to soapstock storage tank. Light oil goes to heater to react with alkali inside mixer. After reaction, using second self-cleaning centrifuge to separate oil and soapstock.Separated soapstock will be delivered soapstock storage by soapstock pump. Light oil will be adjusted temperature by heater and mixed with hot water to be washed in order to remove residual soap. Then using third centrifuge to separate water.
D. After heat exchanging/heating/vacuum drying, crude oil will be delivered to Decoloration.
2. Decoloration
After degumming and Deacidification, crude oil will be heated and mixed with clay and go to decoloring tower to bleach. Clay is delivered to storage bin by blower,and added to oil during production. Decolored oil will be filtered inside vane filter. Filtered unclear oil will be decolored again inside decoloring tower. Decolored clear oil will be send to next step after safe filter. Waste clay will go to storage after filter.
3. Deodorization
A. After heat exchanging ,decolored crude oil will be heated to a required temperature and delivered to deodorizing tower.
. When deodorizing, crude oil is flowing from the top of deodorizing tower layer by layer , on every layer crude oil will be contacted with direct steam and be removed bad smells under high temperature vacuum conditions.
C. Gas will be discharged from top and be caught by fatty acid catcher. Non-condensable gases is drew off by vacuum pump. Part of caught fatty acid continues cycling to catch more impurities, other part is pumped to storage.
D. At the bottom of deodorizing tower, there is a level control system to control liquid level.E. After oil-oil heat exchanginig, crude oil will be cooled down to safe temperature, and filtered to be edible oil.
This continuous soybean oil refining process can be used for many different oil ,such as mustards oil, rapeseed oil, nigreseed oil etc. based on this process adding dewaxing for sunflower oil refining and adding fractionation for palm oil refining.
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