Datetime: 2023-06-24 12:07:48 Visit: 0
Refining can be divided into: Simple refining, Full refining, Dewaxing. Contains steps: dephosphorization, deacidification, dehydration, decolorization, deodorization and dewaxing.
Because corn oil contains free fatty acids, phospholipid-bound proteins, mucous and other non-glycerol vinegar impurities, it exists in the form of colloids in corn oil.
These colloidal substances will produce foam in the heating process, and will emulsify oil and lye in the alkali refining process, affecting the refining of corn oil. So the corn deep processing equipment in the alkali refining before the first hydration degumming treatment hydration is in the case of corn oil heating to 75-80C, adding 5%-10% of the oil water and water at the same time, must be stirred, and add the appropriate amount of salt, in the hydration process, colloidal expansion and dissolve into the water, and then the water containing colloidal and oil separation, Achieve the purpose of hydration and degumming.
Corn oil oil often contains a lot of free fatty acids, acid value is generally about 6 and some as high as 10. The process of alkali refining makes the free fatty acid and alkali form flocculent soap, adsorb the impurities in the oil, and further purify the oil, which has an important influence on the decolorization or hydrogenation of corn oil in the next step. Caustic soda is generally used in alkali refining, which has a good deacidification effect and can also improve the color of oil.
The disadvantage is that there is a small amount of saponification. If the sodium carbonate base is used, it can prevent the saponification of neutral oil, but the color of the oil is poor. The alkali refining process produces soap feet, which settle at the bottom of the alkali refining tank and are easy to separate.
Although the oil content in corn is small, but the cholesterol is low, it is easier for people to absorb, and it is also very good for the human body, so many health experts recommend that you use corn oil.
And corn oil for edible oil leaching equipment is a very big challenge, but this can produce very good oil, the general leaching equipment is the choice of cold press production method corn oil is extracted from the corn germ oil.
The fat content of corn germ is between 17% and 45%, accounting for more than 80% of the total fat content of corn. The fatty acids in corn oil are characterized by unsaturated fatty acid content as high as 80% to 85%. Corn oil itself does not contain cholesterol, which is very good for the body of the elderly, so the market value is very high.
