How much caustic soda does it take to refine 1 liter of cottonseed oil?
Usually, The refining process of cottonseed oil includes degumming, deacidification, decolorization, and deodorization, we choose to add sodium hydroxide for alkali refining and deacidification, so how much caustic soda is needed to refine 1 liter of cottonseed oil? Before answering this question, let's take a closer look at the process of cottonseed oil refining:
Cottonseed oil refining process
1. Hydration and degumming
Using the hydrophilicity of colloidal impurities such as phospholipids, a certain amount of water or electrolyte dilute solution is added to the crude oil while stirring, so that the colloidal impurities in the crude oil can absorb water, swell, agglomerate and separate.
2. Alkali refining and acid removal
All unrefined crude oils contain a certain amount of free fatty acids. The process of removing free fatty acids from fats is called deacidification. Generally, the proportion of sodium hydroxide added to crude oil is 2-3‰, so 1L cottonseed oil needs to add 2-3ml of alkali(caustic soda).
3. Adsorption decolorization
Oil adsorption decolorization is the use of some substances (such as bleached soil, active clay, activated carbon, etc.). It has strong selective adsorption for pigment, adsorbing impurities such as pigment in oil under certain conditions, so as to achieve the purpose of decolorization.
4. High temperature deodorization
The principle of steam distillation deodorization (also known as stripping) is that water vapor through oil containing odor components, vapor liquid surface contact, water vapor is saturated with volatile odor components, according to its partial pressure ratio escape, so as to achieve the purpose of eliminating odor components.
Cottonseed oil contains gossypol, colloidal impurities, free fatty acids, waxes and other impurities, which are removed by cottonseed oil refining machine to ensure the safety and quality of cottonseed oil and prolong the storage time of oil products.(Recommend reading: Cottonseed oil refinery plant)
Cottonseed oil refining machine
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