Scientific name: sodium hydroxide (chemical formula: NaOH)

Alias: caustic soda; Caustic soda; Caustic soda; Caustic soda; Solid alkali. Costa's

Flake shape

Flake alkali is a white translucent flake solid. Industrial grade flake alkali is allowed to have microstrip color according to the national standard (gb209-2006).

Properties of caustic soda

Pure sodium hydroxide is a white solid, which is very soluble in water. Its aqueous solution has astringency and greasy feeling. Sodium hydroxide is easy to absorb water when exposed to the air, and the surface is wet and gradually dissolves. This phenomenon is called deliquescence. Its relative density is 2.130. Melting point 318.4 ℃. Boiling point 1390 ℃. There are two kinds of caustic soda sold in the market, solid and liquid: pure solid caustic soda is white, blocky, flaky, rod-shaped, granular and brittle; Pure liquid caustic soda is a colorless and transparent liquid. Solid caustic soda has strong hygroscopicity. Soluble in water, exothermic when dissolved, the aqueous solution is alkaline and greasy; Soluble in ethanol and glycerol; Insoluble in acetone and ether. It is highly corrosive and has corrosive effect on fibers, skin, glass, ceramics, etc. It reacts with metallic aluminum and zinc, non-metallic boron and silicon to release hydrogen; Disproportionation reaction with halogens such as chlorine, bromine and iodine; Neutralize with acids to form salt and water.

Caustic soda application

1. Used in the production of papermaking and cellulose pulp;

It is used in the production of soap, synthetic detergent, synthetic fatty acid and the refining of animal and vegetable oils.

3. Textile printing and dyeing industry is used as desizing agent, scouring agent and mercerizing agent of cotton cloth.

4. The chemical industry is used to produce borax, sodium cyanide, formic acid, oxalic acid, phenol, etc.

5. The petroleum industry is used to refine petroleum products and in oilfield drilling mud. It is also used in the production of aluminum oxide, metal zinc and metal copper surface treatment, as well as glass, enamel, tanning, medicine, dyes and pesticides.

6. Food grade products are used in the food industry as acid neutralizers, peelers for oranges, peaches, etc., detergents for empty bottles, cans and other containers, as well as decolorizers and deodorizers.

7. It can also be used as alkaline desiccant. Caustic soda is widely used in the national economy, and many industrial departments need caustic soda.

The most commonly used caustic soda is chemical manufacturing, followed by papermaking, aluminum smelting, tungsten smelting, rayon, rayon cotton and soap manufacturing. In addition, in the production of dyes, plastic pharmaceuticals and organic intermediates, the regeneration of old rubber, the point hydrolysis of metal sodium and water, and the production of inorganic salts, the production of borax, chromium salt, manganate, phosphate also requires the use of a large amount of caustic soda.