Regarding the issue of reduced chlorine purity
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This post was last edited by sunjl1981 on 2013-1-6 at 23:35. Our company uses electrolyzers manufactured by Asahi Kasei of Japan for ion-exchange membrane electrolysis; these electrolyzers have been in use for 3 years now. Recently, there has been a decrease in the purity of chlorine gas. I would be very grateful if everyone could provide a detailed analysis of this issue. # ， ， &
The main reasons for the decrease in chlorine purity are as follows: 1. Due to the decline in membrane performance, an increased amount of OH ions migrate to the anode chamber, where they discharge to produce oxygen, thereby reducing chlorine purity; at the same time, side reactions within the electrolyzer intensify； 2. Are there any leaks in the corresponding pipes? ；
I think it’s mainly due to a decline in the membrane’s functionality, along with an increase in the severity of side effects
To reduce the purity of chlorine, it is necessary to determine whether there is a high level of oxygen or hydrogen in the chlorine, and adjustments must be made based on the specific manufacturing process. 1. If the hydrogen content in chlorine is high, it is mainly caused by pinhole defects in the membrane, which means the membrane needs to be replaced. 2. If the oxygen content in chlorine is high, it is mainly due to an increase in anodic side reactions. For the acid addition process, the amount of acid added can be increased appropriately, and the quality of the brine should be checked ； For the acid-free process, the decrease in membrane reverse osmotic performance is mainly due to the quality of the brine. Under optimal operating conditions, the service life of the ion exchange membranes produced by Asahi Kasei in Japan is generally 3 to 4 years. Since the person in question said that the membranes have been in use for 3 years, this means their lifespan is approaching its end. It is recommended to conduct an evaluation of the system’s performance in order to determine the appropriate time for replacing the membranes (the lead time for ordering ion exchange membranes from Japanese suppliers is quite long!) ）
It is recommended to conduct a test with a single membrane, and make a decision based on the results. There are many reasons for this phenomenon; the recent decrease in the purity of the pure substance we produce is due to perforations in the electrodes
When the purity of chlorine decreases, it is necessary to analyze what has increased and caused this drop in purity, such as an increase in oxygen or hydrogen content. Conduct a comprehensive analysis of the electrolytic cell to determine whether the salt content in sodium hypochlorite, sodium chlorate, and the alkali has increased, and to figure out what is causing it.
It is recommended to conduct a comprehensive check on the chlorine purity of the cell units and to monitor changes in cell voltage. Check for membrane leakage; if the ion membrane is intact. It may be caused by a decline in performance as the membrane reaches the end of its lifespan.
There are pinholes that cannot be detected! ! ! :time: