Introduction to caustic soda

Caustic soda, chemical name sodium hydroxide, white translucent flaky solid, is a basic chemical raw material, widely used in papermaking, synthetic washing and soap, viscose fiber, rayon and cotton fabrics and other light textile industries, pesticides, dyes, Rubber and chemical industry, petroleum drilling, petroleum industry for refining petroleum oil and tar, as well as machinery industry, wood processing, metallurgical industry, pharmaceutical industry and urban construction, etc. It is also used in the manufacture of chemicals, paper, soap and detergent, rayon and cellophane, processing bauxite to make alumina, and also used in mercerizing of textiles, water treatment, etc.

Caustic soda is a basic chemical raw material. Its solid form includes flakes, blocks, and granules. It can be widely used in many industries. In order to let users know more about it, we will introduce it below understanding of basic properties.

The pure product is a colorless transparent crystal with a relative density of 2.130, a melting point of 318.4°C and a boiling point of 1390°C. There are two types of products on the market: solid and liquid: pure solid caustic soda is white and translucent, in block, flake, rod, granular, and brittle; pure liquid is colorless and transparent.

Solid caustic soda has strong hygroscopicity, easily soluble in water, exothermic when dissolving, the aqueous solution is alkaline and has a greasy feeling; soluble in ethanol and glycerin; insoluble in acetone, highly corrosive, and harmful to fibers, skin, glass, Ceramics, etc. are corrosive. React with metal aluminum and zinc, non-metal boron and silicon to release hydrogen; disproportionate with chlorine, bromine, iodine and other halogens; neutralize with acids to generate salt and water.

When storing solid caustic soda, pay attention to sealing it tightly to prevent it from being exposed to the air to absorb moisture and deliquescence or to be mixed with carbon dioxide. When using glass bottles to hold sodium hydroxide in solid or other forms, glass stoppers should not be used, and rubber stoppers should be used instead, because sodium hydroxide will react with silicon dioxide in the glass to form sodium silicate, which will cause the stopper and the bottle to collide. Body bonding is not easy to open.