Oil is a compound of many kinds of glycerol triester. Oil fractionation is the process of separating oil into different glycerol triester at certain temperatures. Oil fractionation is a physical process, with no expensive or hazardous chemical additives, no chemical reaction, no loss and waste water. Crude Oil fractionation is applied in processing palm oil, sunflower oil, cottonseed oil, rice bran oil, fish oil, lard oil, chicken oil etc.
Fractional Distillation of oil Equipment applies to palm oil, cotton seed oil, fish oil, lard oil, chicken oil, algal oil, linseed oil, etc. The most widely used is the dry fractionation of palm oil.
After palm oil refining, palm oil fractionation is required by some one to separate palm oil into palm olein,palm stearin or palm mid fraction in order to have more uses of palm oil.
Dry fractionation is one most economic method without adding any solvent, just slowly cooling down melted palm oil ,crystallizing oil and filtering to separate solid oil. There are three steps of dry fractionation: heating, crystallizing,filtering to separate.
Before crystallizing, palm oil will be heated to melt completely.
2. Cooling and crystallizing
The main process of dry fractionation is to cool down and crystallize. Good crystallizing, easy separating. So the design of crystallizing tank is very important, but the cooling exchange surface , cooling system and mixing system are basic . The whole process should be well controlled under a certain temperature with even speed in order to make stable,even crystal . The temperature is depending on the quality of olein required, normally is about 20 degree to stop cooling.
After cystallizing, it uses filter machine to separate palm olein and stearin.
Dry fractionation is one method used more often in oil fractionation , it is easy to operate, and has advantages of high automation, low steam consumption ,no pollution and good quality of final products