The principle of distillation acid, under the same conditions, the vapor pressure of free fatty acid is far greater than the vapor pressure of three esters, according to the physical properties, use them in the same temperature under the relative volatility of different separation.Natural oils belong to heat sensitive material, under the normal pressure of high temperature stability, often when reached the boiling point of free fatty acids, which have begun to oxidative decomposition.However, when the oil zhongtong don't mix with oils into the inert group, free fatty acids in the boiling point is greatly reduced.
Under the condition of vacuum, using steam as auxiliary agent, can be in less than three esters thermal decomposition temperature removing free fatty acids.Distillation acid and oil deodorization are application of water vapor distillation principle, theories about steam stripping, influence factors and process equipment such as deodorization section discussed in subsequent chapters.
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