Is the ion exchange membrane sensitive to contact with chlorine?
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This post was last edited by sunjl1981 on 2013-1-6 at 19:48. Assumption: When there is a power outage to the ion exchange membrane, there is no backup power source; as a result, it is not possible to absorb the chlorine in the electrolyzer and the chlorine pipelines. At the same time, that chlorine cannot spread into the atmosphere either. Therefore, the chlorine in the system is contained within the system using valves. Question: Could the chlorine in the electrolyzer cause severe damage to the ion exchange membrane? How should the chlorine-hydrogen pressure difference be controlled at this time? # ， ， &
As long as the voltage difference between the anode and cathode is well controlled, it will not have a significant impact on the ion membrane; after all, the anode is designed to be in contact with chlorine gas. In the case of a small voltage difference or a negative voltage difference, chlorine gas will penetrate the ion membrane and combine with the hydroxide ions at the nearby cathode, resulting in the formation of sodium chloride and chlorates that deposit within the membrane. . . It is particularly important to ensure that there are no dry areas on the ion exchange membrane; if the brine does not circulate, the dissolution of chlorine in the brine will lower the pH value, acidifying the membrane, and the free chlorine generated will migrate to the cathode, causing corrosion. This post was last edited by yzhms on 2009-4-16 17:46]
As LZ mentioned, in the system where chlorine is held back within the system using valves, an excess of chlorine in the tank can poison the ion exchange membrane.
It will cause certain pollution to the ion membrane. Primarily, the battery effect occurs due to parking; at the anode, chlorine atoms are reduced to chloride ions, while at the cathode, a reaction involving the metal takes place, causing the cathode to corrode and the membrane to become contaminated. The presence of chlorine gas facilitates the galvanic cell reaction.
It is mainly to prevent the anode pH from dropping too low, which could cause acidification of the membrane.