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Alkali refining

TIME:2014-11-10 08:53:06FROM: AUTHOR:
Alkali refining, is neutralized with alkali free fatty acids, and also removing a part of other impurities refining method. There are many by the alkali, such a...

Alkali refining, is neutralized with alkali free fatty acids, and also removing a part of other impurities refining method. There are many by the alkali, such as lime, organic alkali, soda and caustic soda etc.. The most widely used in China is caustic soda.
Principles of alkali refining alkali refining is free fatty acid alkali solution and crude oil occurs in the neutralization reaction.
The reaction equation as follows: RCOOH+NaOH→RCOONa+H2O

In addition to the neutralization reaction, and some physical and chemical effect.
The caustic soda can free fatty acid neutralizing crude oil, formation of sodium to make soap (commonly known as soap), it is not easy in the oil become gelatinous material dissolution and precipitation.

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The soap has strong adsorption capacity. Therefore, a considerable number of other impurities by the adsorption and precipitation, and even mechanical impurities is no exception.
The neutral oil containing considerable amounts of alkali refining generated soapstock, its reason mainly lies in: between sodium soap and neutral oil glue solution; neutral oil is sodium soap wrapped; adsorption of neutral oil soapstock condensed into floc when.
In the neutralization of free fatty acid at the same time, neutral oil may also be increased loss of saponification. Therefore, we must choose the best conditions, in order to improve the oil rate.
Alkali refining method according to equipment to points, there are intermittent and continuous two kinds of alkali refining method, while the former can be divided into low and high temperature of two kinds of operation method. For small oil mill, is generally used in intermittent low temperature method.
Continuous alkali refining continuous alkali refining process that generates continuous. Some equipment can automatic adjustment, simple operation, high production efficiency, the main equipment used in this method is of high speed centrifuge, commonly used in a tube and disc type high-speed centrifuge.