Caustic Soda Lye is one of the most widely used chemicals in the industry.

Caustic soda is a solution of Sodium hydroxide (NaOH) in water. It is a strong base with a wide range of applications in different industries. Nouryon produces caustic soda together with chlorine and hydrogen from the electrolysis of salt brine. With our production in four plants in Europe and our quality commitment, Nouryon guarantees a high service level towards our customers.

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.


  • water demineralisation: regeneration of ion exchangers
  • drinking water production: partial water softening
  • beverages: bottle-cleaning
  • dairy: cleaning production installations
  • rayon industry: preparation of spinning solutions
  • pharmaceutical industry: various products, including sodium lactate
  • cooking oils and fats: refining and purification
  • production of starches and derivatives
  • petroleum industry: refining and desulfurisation
  • waste-water treatment: pH-correction, flocculant enhancers
  • steel production: ammonia recovery in cokes production