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Process

Electrolysis in electrolyzer

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)

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