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Caustic Soda

Caustic Soda

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Description
Refined oil but also with caustic soda. In order to remove the oil fraction of the gum, the general increase in the oil fraction in concentrated sulfuric acid to make the gum as residue and precipitation. After pickling, the oil-in also contains phenols, naphthenic acid and other acidic impurities and excess sulfuric acid, caustic soda solution must be washed, and then washed in order to obtain refined petroleum products.

In the paper industry, the first to use chemical treatment, which will contain cellulose raw materials (eg wood) and made of chemical pulp cooking. The so-called alkaline pulping solution is to use caustic soda or soda ash as a raw material in the cooking liquid to remove the lignin, carbohydrate, and resin, and organic acids and in which, so put Cellulose separated.

In the metallurgical industry, often make the active ingredients in the ore into soluble sodium salt to remove any insoluble impurities which, therefore, often need to add soda ash (it is the flux), sometimes with caustic soda. For example, in the aluminum smelting process, the cryolite used in the preparation and processing of bauxite, soda ash and caustic soda should be used. Another example is when the smelting of tungsten is first roasted concentrate and soda ash into soluble sodium tungstate, and then analyzed by acid, dehydration, reduction processes such as tungsten powder obtained.

In the chemical industry, metal sodium, the electrolysis of water to be used for caustic soda. The production of many inorganic salts, especially the preparation of a number of sodium (such as borax, sodium silicate, sodium phosphate, sodium dichromate, sodium sulfite, etc. ) should be used in caustic soda or soda ash. Synthetic dyes, medicines and organic intermediates, caustic soda or soda ash should be used.
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