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The purpose of deacidification is off the oil free fatty acids, the main physical and chemical deacidification deacidification two methods, the former is the use of the principle of distillation, the boiling point of fatty acid and grease using a different between the high temperature and high vacuum conditions , the removal of the fatty acid was distilled off; the latter is the use of sodium hydroxide saponification of free fatty acid in the oil was removed by separation; in principle, the physical approach is ideal, but in practice, due to the poor quality of the feedstock pre-treatment process impurities, oil processing plant is currently mostly used chemical methods. However, due to the removal of acid and sodium hydroxide to produce soap and water uses has been the focus of environmentalists. For this reason, potassium hydroxide and sodium silicate alkali refining in France and deacidification processes provide a new method for chemical refining.

Potassium hydroxide (KOH) process was developed by the American Agrotech companies. The process has two characteristics: ① in the traditional alkaline deacidification of sodium hydroxide (NaOH), potassium hydroxide instead (KOH), so that the free fatty acids into a potassium soap; ② the deacidification wastewater using ammonia (N: 83%), or by hydroxide (NH40H; N: 28%), so that water becomes a liquid nutrient containing NPK fertilizer.
Process sodium law developed by the US OxychemlTamu companies. Sodium silicate process characteristics: Refining soap without centrifugation, filtration separation instead.