Seeking help with acid addition to electrolyzer
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I’m seeking help as stated in the title. Recently, the acidity of the brine entering our factory’s cells has been around 0.08–0.09, but the acidity of the brine exiting the cells is only around 0.0002–0.0003. The concentration of hydrochloric acid used for feeding into the cells is about 17%, and the pH of the brine is 10.17; a total of 600 liters of acid have been added. All the membranes used are new. What could be the reason for this? The temperature of the cells isn’t very high either – the highest temperature reached is 86.8°C. Thank you
This post was last edited by Weng Qiuming on 2017-7-21 at 17:48. Please provide the model of your electrolyzer, its load capacity, the concentration of chlorate produced, and the data related to chlorine gas.
What is the pH of the brackish water exiting the tank? Does the new membrane really require that much acid? What is the chlorate content in the brackish water exiting the tank? How much oxygen is in chlorine?
The last edit to this post was made by wenqiang0513 on 2017-7-24 at 15:37. The oxygen content in chlorine is around 0.35–0.36, the chlorate level is 2.41–2.48, the purity of chlorine gas is 98.8%, and the hydrogen content is 0.02; all these values seem quite normal
What is the pH of the brackish water exiting the tank? Shouldn’t too much acid be added to the new membrane? What is the chlorate content in the brackish water exiting the tank? How much oxygen is in chlorine? Omit the character ’ No’ earlier
Here are a few points for the original poster’s reference: 1. When determining the amount of acid to add to ion-exchange membrane electrolyzers, it’s not enough to look at the total amount; instead, one should consider the average amount of acid per individual cell. 2. The load level of the electrolyzer, cell temperature, concentration of the electrolyte, etc., also affect the amount of acid to be added. 3. The chlorine purity there, as well as the levels of hydrogen and oxygen, are all within acceptable limits. Therefore, you should pay attention to monitoring the voltage of the unit and the condition of the outlet hoses, to check whether any of the ion exchange membranes have pinholes 4. You need to conduct a horizontal comparison of the amount of acid added to the electrolyzer, in order to determine whether there is a sudden increase or a gradual rise; this makes it easier to identify the root cause of the problem at that point.
Principle: It’s better not to add it than to add too much.