Physical and chemical properties: pure product is colorless transparentcrystal, the relative density of 2.130. Melting point 318.4 DEG C. Boiling point 1390. Has a strong moisture absorption. Soluble in water, dissolving heat, alkaline aqueous solution, soapy; soluble in ethanol and glycerol; insoluble in acetone, ethyl ether. Extremely corrosive, have a corrosive effect on the skin, glass, ceramic fiber,etc; The reaction of hydrogen with aluminum and zinc, boron and silicon, etc; and the disproportionation of chlorine, bromiine, iodine,etc.
Mainly used in papermaking, cellulose pulp production, soap, synthetic detergents, synthetic fatty acid production and animal and vegetable oil refining.
In textile printing and dyeing industry, it is used as desizing agent, scouring agent and mercerizing agent for cotton cloth.
The chemical industry is used to produce borax, sodium cyanide, formic acid, oxalic acid, phenol, etc
The petroleum industry uses it to refine petroleum products and oil field drilling mud. Also used for surface treatment of alumina, zinc and copper, glass, enamel, leather, medicine, dyes and pesticides. machinery industry, wood processing metallurgy, medicine industry and city construction. Also used in the manufacture of chemicals, paper, soap and detergent, rayon and cellophane, processing bauxite alumina, also used for textile mercerization water treatment etc.
In recent years, the production process of China’s caustic soda industry has changed significantly. The proportion of ion-exchange membrane caustic soda is increasing rapidly. Diaphragm caustic soda has been withdrawn year by year in accordance with the guidance of the 2011 version of the “Industrial Structure Adjustment Guidance Catalogue”. By the end of 2017, the proportion of membrane caustic soda was almost completely withdrawn, and the proportion of ion-exchange membrane caustic soda accounted for 99.4%. Ion-exchange membrane caustic soda is produced by electrolyzing salt water by the ion-exchange membrane method. The ion-exchange membrane caustic soda method has the advantages of high quality of caustic soda, low energy consumption, low investment, and high purity of chlorine and hydrogen, and there are no pollution problems such as mercury pollution in the production of mercury soda and asbestos waste in the production of diaphragm soda.
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