What is the purpose of adding hydrochloric acid to the brackish water coming out of the electrolyzer? _?
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What is the purpose of adding hydrochloric acid to the brackish water coming out of the electrolyzer? _?
To maintain the pH of the brackish water at around 2, it facilitates the conversion of hypochlorous acid into chlorine gas, while also reducing the solubility of chlorine gas. By maintaining a certain level of vacuum, an excellent dechlorination effect can be achieved in the dechlorination tower.
The brackish water coming out of the electrolyzer contains a large amount of chlorine; approximately 0.7–0.8 kilograms of chlorine are present in every 1 cubic meter of this water. In the saltwater, the following reaction takes place: CL2 + H2O = ClO- + H+ + Cl-. Adding salt and acid serves to disrupt this balance, causing the reaction to proceed in the opposite direction, thereby facilitating the production of Cl2. Furthermore, the dechlorination tower operates under negative pressure, which reduces the partial pressure of chlorine at the liquid surface. This causes the warmer brine to reach a boiling state, generating large amounts of water vapor; the bubbles formed help to carry away the chlorine.