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The process of degumming is based on the process for removal Phosphatides, which is also called gums. The common usage refers to the array of Phosphatides present in mostly all crude Oil, although all crude vegetable oils contain Gums. Degumming of oil is done to prepare degummed oil for caustic & physical refining.Water & Phosphoric acid added to crude oil to hydrate the phosphatides& thus prepare them for removal by gravitational forces or centrifugation. The centrifugation type is used in the medium process.The hydrable phosphatides (HP) are readily removed by the addition of water & Phosphoric Acid, whereas the Non Hydrable Phosphotides (NHP) are relatively unaffected by water & tend to more oil soluble (i.e. remain in oil phase to remove the same) some quantity of caustic may be given to remove the same (that is called partially Neutralize with dilute lye (Hydration Water). Deep degumming utilizes a reagent like acid to chilate Iron, Calcium and Magnesium away from NHP Complex once the Iron, Calcium and Magnesium are removed from NHP Complex Phosphatides become hydrable.Enzymatic degumming also utilizes on enzyme to modify the NHP into hydrated gums.Neutralization
Neutralization or caustic refining process can be occuring for crude oil, crude degumming oil or a mixture. The long -mix caustic refining system is recommended. Less caustic use lower neutral oil less and lower the cost of Caustic and soap stock with the use of two water phases, it is possible to produce good refined oil with low 'P' content and low soap content. The reaction involved in degumming & alkali refinery is as follows: Phospholipids (HP) + Water = Hydrated gums Phospholipids (NHP) + Acid or Alkali = Hydrated gums Metal/phospholipids complex + Acid = Hydrated metal gums Free Fatty acid + Alkali = Soap