Sodium hypochlorite antiseptic solution (NaOCl) has been widely used all over the world to prevent the spread of epidemic diseases. However, due to its low sterilizing power, it needs high concentration of activated chlorine, which is harmful to the human body and environment and results in the corrosion of metal products.
Scientists found that disinfection is caused by hypochloric acid(HOCl), not sodium hypochlorite (NaOCl) and recommended using hypochloric acid with pH 6~7.2, ORP≧900mV for disinfection. Accordingly, hypochloric acid is being produced by electrolysing admixed solution of NaCl, HCl and H2O in electrolytic baths without diaphragms, but this method is restricted in its output.
A research team led by Choe Hyon Ho, a section head at the Faculty of Electronics, has succeeded in preparing neutral electrolytic water with hypochloric acid by mixing sodium hypochlorite (NaOCl), chlorhydric acid (HCl) and water (H2O) sodium hypochlorite antiseptic solution at the sodium hypochlorite antiseptic solution production sites existing in the DPRK.
They determined the ratio of additional amount of chlorhydric acid to the mixing amount of water for preparing neutral electrolytic water through some basic experiments.
The preparation method can satisfy the demand for neutral electrolytic water with hypochloric acid for several uses with less consumption of salt, electrolytic plates and electric power than before.
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