Degumming of edible oil refining
Fats and oils after pretreatment, leaching, need to be refined, refining process at present mainly includes degumming, deacidification, dehydration, decolorization, deodorization and other processes, can be separated from the impurities in the oil and grease, remove, and control it in the range of the national standard allows, degumming as the first process of refining, has a very important role for the back of the refining stage of the other processes to lay a good foundation, the following let's together Let's take a look at why the oil refining equipment should be degummed first.
Gross oil contains phospholipids, proteins, mucilage and sugar-based triglycerides and other impurities, because of the composition of the soluble system with the oil and grease is called the soluble impurities. The presence of these impurities not only reduces the edible value and storage stability of fats and oils, but also in the refining and processing of fats and oils, there are a series of adverse effects, resulting in a decline in the quality of finished oil.
I. Purpose of degumming in refining stage
The process of removing colloidal impurities in the crude oil is called degumming. Gum soluble impurities in the oil is mainly phospholipids, so the industrial production of degumming is often called dephosphorization. In the alkali refining before the removal of colloidal impurities, can reduce the loss of neutral oil, improve the quality of refined oil, can save the amount of alkali, and can obtain valuable by-products - phospholipids.
Second, the impact of gum on oil and grease
1、Deodorization at higher temperature, gum will be carbonized, increase the color of oil and grease, hydrogenation will reduce the rate of hydrogenation, etc. Therefore, in the oil refining process, it is generally used to reduce the loss of neutral oil. Therefore, it is generally the first degumming in the oil refining process.
2、Decolorization gum will cover part of the active surface of the decolorant, so that the decolorization efficiency is reduced;
3、Gum will lead to excessive emulsification when alkali refining, so that the oil and soap can not be well separated.
