How to refine edible oil ?

Edible oil refining process is as below:
Crude edible oil – degumming – deacidification – decolorization – deodorization – edible oil product

Edible oil refining machine

Following is edible oil refining process:
A.Degumming part:
This is the most important section of hydrate de-gumming, the water (there is a little P-acid in water) amount, temperature and water adding speed are very important.

B.Deacidification part:
Using alkali like (NaOH) to neutralize FFA in oil, during this process it will produce soapstock , then separating it from the oil. NAOH solution not only neutralize free fatty acid, but also can act with other substances like protein, mucus, phospholipid, pigment.

C.Decolorization part:
Because there is pigment in crude oil, the oil color is dark. In order to improve oil color, we need to using the active clay to absorb the pigment away , then using vibrating filter to separate the waste clay. If you want to get light color oil, you need to add more active clay. Customer can accord to his requirement to control the oil color.

D.Deodorization part:
Control oil temperature to 250 ~ 270 ℃ when decolorized edible oil enters into deodorizer, in direct steam injection, the free fatty acids, ketones, aldehydes and other impurities are removed from the oil, the thermal decolorized action also occurs, and the pigment composition is cleaved distilled from the oil. Deodorized vacuum (absolute pressure) controlled at 266 Pa, the deodorization time is about 2h.

Edible oil is indispensable in our daily life, no matter what kind of food you make. Especially in China, we have accumulated thousands of years diet culture, and edible oil quality will directly influence the food flavor. Thus high quality edible oil is definitely important. It is said that the edible oil without refinery is full of impurities such as gums, pigments, waxes, phosphatides and free fatty acid (FFA), among which some are harmful to our health. Edible oil refinery is essential to remove them and offer us the first or second grade edible oil.