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For this purpose, a saturated solution of sodium chloride is produced in a salt dissolving tank included in the scope of delivery which is then electrolysed in a membrane cell. Chloride-free sodium hydroxide and hydrogen are produced in the cathode chamber and chlorine gas and scaled down residual brine in the anode chamber separated by the membrane. The resulting chlorine gas is bound with sodium hydroxide, collected in a storage tank as sodium hypochlorite and from there metered with separate metering pumps as needed. Because of the moderate pH value of approx. 9, the pH value of the treated water is significantly less affected than when using commercially available sodium hypochlorite (pH 12-13.5).
The generated hydrogen is diluted with fresh air through an ATEX-certified ventilator and discharged safely. The salt dissolving water comes from a softener integrated in the plant. Thus, lime deposits can be prevented and a long service life of the electrolytic cell can be ensured. The efficiency of the electrolysis is monitored by an integrated pH measurement of the sodium hydroxide production.
The plants are controlled with a modern PLC with large, illuminated display and integrated modem for remote diagnosis and troubleshooting.
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