Caustic soda and soda ash

Caustic soda is soluble alkali, soda ash, in fact is a salt, because it happens in the water alkaline hydrolysis and make the solution, again because it has some similar properties and caustic soda, so it tied with caustic soda, called "two base" in industry.

Caustic soda and soda ash are soluble in water, a strong alkaline, can provide the Na + ions. These properties make them is widely used for making soap, textile, printing and dyeing, bleaching, papermaking, refined petroleum and chemical industry, metallurgy and other departments. Plain soap is senior fatty acid sodium salt, usually with grease in slightly under the action of an excess of caustic soda were made by saponification. If direct use fatty acid as raw material, also can use soda instead of caustic soda making soap.

In the papermaking industry, must first treated with chemical method, will contain cellulose raw materials (e.g., wood) and chemical cooking made into pulp. So-called alkaline pulping is used as cooking liquid caustic soda or soda solution to remove lignin and carbohydrate in the material and resin, etc., and with the organic acid, this is to separate the cellulose.

In the metallurgical industry, tend to be the active ingredient in the ore into soluble sodium salt, in order to remove the insoluble impurities, as a result, often need to join the soda ash (it is flux), sometimes with caustic soda. Used in aluminum smelting process, for example, the preparation of cryolite and the processing of bauxite, soda ash and caustic soda are used. And such as tungsten smelting, is also the first to concentrate and soda roasting into soluble sodium tungstate, then through acid out, dehydration, reduction process and made of tungsten powder.

In the chemical industry, metallic sodium, electrolysis of water with a caustic soda. Some many inorganic salt production, especially the preparation of sodium salt (e.g., borax, sodium silicate, sodium phosphate, sodium dichromate, sodium sulfite, etc.) are used caustic soda or soda ash. Synthetic dyes, drugs and organic intermediates etc also need caustic soda or soda ash.

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