Sodium hydroxide：

Sodium hydroxide is a basic chemical raw material widely used in the chemical industry, metallurgy, papermaking,

petroleum, textiles, and the daily chemical industry. It is the main raw material for manufacturing soap. In the oil 

refining industry, it is used for the removal of acid residues from various oils after pickling, as well as for 

eliminating oil odours and improving colour. In the pulp and paper industry, sodium hydroxide helps dissolve 

impurities in pulp under high temperature and pressure, allowing for the extraction of pure fibre for papermaking.

It is also used in the manufacturing of artificial fibres.