Crude palm oil refining process and refining purpose introduction

 Rrude palm oil refining generally refers to the process of removing impurities in crude palm oil and improving the purity of final vegetable oil. The existence of impurities in crude palm oil not only affects the edible value and safe storage of oil, but also brings difficulties to palm oil deep processing. The refining process of crude palm oil can be divided into four process steps: hydration degumming, alkali refining deacidification, adsorption decolorization and high temperature deodorization. [Related reading: Palm oil refining machine types and their characteristics ]

 

Hydration degumming is to separate the peptizing impurities in the crude oil. Its working principle utilizes the hydrophilicity of peptized impurities to add an appropriate amount of warm water to the crude oil and stir to make it absorb water and aggregate into agglomerates.

Alkali refining deacidification is to separate the free fatty acids in the crude oil, reduce the acid value of the oil, and avoid rancidity of the oil during long-term storage. Using the principle of acid-base neutralization, add an appropriate amount of stirring to the crude oil to make it react to form saponins. After precipitation and washing, the free fatty acids in the crude oil can be fully separated, and the acid value can be controlled within an appropriate range.

Adsorption decolorization is to separate the pigments contained in the crude oil, some of which are carried by the oil itself, and some new pigments produced in the production. Activated clay is usually used for adsorption and decolorization. Activated clay has strong adsorption capacity and can adsorb a variety of pigments and small molecular impurities.

High temperature deodorization is to separate the odorous substances in the crude oil and improve the flavor and taste of the oil. Steam is introduced into the crude oil under vacuum conditions, and the unpleasant odor in the crude oil is separated by utilizing the different volatility of grease and odorous substances.

Refining is an important barrier for the quality assurance of edible oil. Usually, after the above four palm oil refining steps, most of the impurities in the crude oil can be better separated, and the obtained edible oil can basically meet the standard of qualified oil, but the specific situation is still Subject to actual production.

 

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