Process

Flow of seawater or brine between sets of electrodes (anode and cathode) in an electrolyser connected to a source of direct current, the chemical reactions which take place in the electrolyzer between chlorine and caustic produced by electrolysis.

Electrochlorination Reaction :

The direct current, passing through the seawater or brine flowing in the electrochlorinator (electrolyzers), where the sodium chloride is completely dissociated into the ions Na+ and Cl-, causes the following electrochemical and chemical reactions:

Reaction at the Electrochlorinators Anode :
2Cl- ----> Cl2 + 2e- (chlorine generation in the electrolyzer)

Reaction at the Electrochlorinator Cathode :
2H2O + 2e- ----> H2 + 2OH- (hydrogen evolution from electrochlorinator)

Chemical Reaction in Electrolyzer :
Cl2 + 2OH- ----> Cl- + ClO- + H2O
NaCl + H2O = NaOCl + H2 (hypochlorite or hypo generation)