Diaphragm cell


The raw material fed to the cell is an aqueous solution of sodium chlorure (brine) at 300 g/l of concentration.
It is fed inside the anodic side is called anolit. A special diaphragm divide anodic from cathodic side.
The solution inside it is called catholit.
The brine flow through the cell is continuous due to the difference of level between the two side of the cell (anodic and cathodic compart). When electricity pass, gas chlorine is formed at the anode and caustic soda and hydrogen at the cathode.
The chlorine gas, is produced on the anode of each cell, then drawn to a general collector where is sucked to the absorption tower for the production of the sodium hypochlorite.


diaframmaSodium hypochlorite is prepared by chlorination of a caustic soda/exhaust brine solution of a proper concentration to obtain a stable product.
The process is based on a “batch”production logic.
The caustic soda/brine solution of proper concentration and at the temperature of 30-35 C, is sent by means of the pumps to the absorption tower.
One tank will be always under filling with fresh caustic soda/brine, the other tank will be in recirculation with the absorption tower.
The chlorine produced from the electrolyser will be sucked by the adapted blowers (as to ensure a constant depressure outside from the electrolysers), and then in back current with the stream of caustic soda reacts forming sodium hypochlorite.
The a.m. reaction product (sodium hypochlorite) is kept under recirculation untill it reaches the wanted concentration.

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