Oil removal in the technological process of the colloidal impurities called degumming, and the colloidal impurities in the crude oil is given priority to with phospholipid, reason - often called degumming dephosphorization.Degumming methods have hydration method, heating method, adding acid method and adsorption method, etc.
1, hydrated degumming is the use of phospholipids and lipid molecules containing hydrophilic group, will be a certain amount of hot water or dilute acid, alkali, salt and other electrolytes in aqueous solution to the oil, the colloidal impurities will swell and coagulation, sedimentation precipitation from oil and grease separation of a refining method and precipitation of colloid is called oil foot.
In the molecular structure of the phospholipids both hydrophobic nonpolar groups, hydrophilic polar groups.When few of water content in crude oil, lecithin in salt type structure, the polarity is very weak, can dissolve in oil, less than the critical temperature, coagulation sedimentation exhalation.When adding a certain amount of water to oil, phospholipid polar groups of water contact with water, put it into water phase, the hydrophobic groups is put into the oil phase.Water molecules and atoms group combination, chemical structure by inside salt type into hydration type.The hydrophilic group of the phospholipid molecules (free hydroxyl) has more strong water absorption capacity, with the increase of palm oil refinery plant (http://www.palmmill.com) water quantity, phospholipids in the water by the original polar groups in aqueous micelle, and then transformed into regular directional arrangement.Groups of hydrophobic molecules into oil phase tail end;Hydrophilic group to water phase, the formation of lipid molecules layer.Hydration of phospholipids and other colloidal substance and polar group, attracted a lot of water molecules around the oil solubility decreases.Small particles of colloid under the influence of polarity attraction, after...