Worldwide, the major users of caustic soda are the aluminum industry, pulp & paper and the chemical industry.
The main applications are water treatment and water purification, as cleaning agent, or a wide range of uses in chemical industry like starch production or for the desulphurization in the petrochemical industry.
Caustic soda is obtained from the electrolysis of salt. A concentrated solution of purified salt (NaCl) in demineralized water (i.e. brine) is decomposed in an electrolytic cell by the passage of an electrical current (DC). In the electrolytic cell, the sodium chloride solution is decomposed to chlorine at the anode and to a sodium hydroxide solution and hydrogen at the cathode.
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