papermaking
Sodium hydroxide plays an important role in paper industry. Because of its alkaline nature, it is used in the process of boiling and bleaching paper.
food industry
Sodium hydroxide can be widely used in the following production processes: container cleaning process; Starch processing; Preparation process of carboxymethyl cellulose; Manufacturing process of sodium glutamate.
water treatment
Sodium hydroxide is widely used in water treatment. In sewage treatment plants, sodium hydroxide can reduce the hardness of water through neutralization reaction. In the industrial field, it is a regenerant for ion exchange resin regeneration. Sodium hydroxide has strong alkalinity and relatively high solubility in water. Because caustic soda is liquid, it is easy to measure the dosage and is conveniently used in various fields of water treatment. Sodium hydroxide is used in the following topics in water treatment: eliminating the hardness of water; Adjust the pH value of water; Neutralization of wastewater; Regeneration of ion exchange resin; Remove heavy metal ions from water by precipitation.
Man made fibres and textiles
In the textile industry, sodium hydroxide is used in the final treatment and dyeing of fibers. Main application: mercerization treatment of synthetic fiber
metallurgy
Sodium hydroxide is used to treat bauxite. Bauxite contains alumina, and aluminum metal exists in alumina. Aluminum is the second most used metal in the world. Sodium hydroxide is also used to produce zinc alloys and zinc ingots.
Washing supplies
Sodium hydroxide has been used for traditional domestic purposes. Until today, the demand for caustic soda for soap, soap and other kinds of washing products still accounts for about 15% of caustic soda.
Soap: making soap is an ancient and extensive use of caustic soda. In the process of making soap, caustic soda is used to neutralize fatty acids
Detergent: sodium hydroxide is used to produce various detergents. Even today's washing powder is made from a large amount of caustic soda, which is used to neutralize the excess fuming sulfuric acid after vulcanization reaction.