The OCEANEF® equipment is aimed at the production of sodium hypochlorite (also referred as Bleach or Javel) through the electrolysis of an electrolyte which is a sodium chloride solution. The equipment is essentially constituted of an electrolyser without separator, including titanium anodes called DSA (Dimensionally Stable Anode), covered with ceramics of precious metal oxides, playing the role of a catalyst in order to facilitate the chlorine evolution and not the oxygen formation.
Under the electrical current effect, the following reactions take place on electrodes:
on anode 2 NaCl → Cl2 + 2 Na+ + 2 e–
on cathode 2 H2O + 2 e– → H2 + 2OH–
Rapidly the compounds diffuse and lead to the reaction:
Cl2 + 2Na+ + 2OH– → NaOCl + NaCl + H2O
If the anodes were not covered with the catalyst, chlorine gas would not evolve, but the oxygen, as for the following anodic reaction:
H2O → ½ O2 + 2H+ + 2 e–
In fact if the concentration of chloride in the electrolyte diminishes too much, the oxygen evolving increases. It is the reason why the chloride content in the electrolyte is controlled carefully.
OCl-, the hypochlorite ion, is produced at the desired concentration of 6,5 g/l of chlorine equivalent, by the mean of the intensity of the electrolysis and of the duration of the electrolysis.
The preparation obtained in the OCEANEF® is a little alkaline, nearly neutral, it is composed of sodium hypochlorite and of hypochlorous acid, when bleach solution is alkaline and contains above all sodium hypochlorite.
There are several models of OCEANEF® equipment to produce the necessary quantity of the preparation called OCEANE solute.