Is it advisable to cancel FI-426?
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This post was last edited by sunjl1981 on 2013-1-6 at 23:10. Our company installed the first set of zero-distance membrane electrolyzers manufactured by Beihua Machinery. Recently, unstable pressure in the pure water pipeline caused frequent leaks in the 426 PVC pipes; as a result, the technicians in the membrane production area decided to stop using 426 together with pure water, and instead use 425 along with acid, in half the usual amount. I’m not sure if this change will have an impact on the electrolytic cell. # + +
OP, how many years has your factory been using ion exchange membranes? If subsequent tests can keep up, such operations can be carried out based on experience; however, it is not recommended to use this approach to solve problems, as the impact of these metrics on equipment and systems occurs over an extended period of time!
Our 426 unit is also not very stable, requiring on-site personnel to make frequent manual adjustments. I feel that you should use half as much of that acid. It may seem like no amount has been reduced, but in reality the total amount of acid used is still less; this must have an impact on the pH of the saltwater fed into the tank. I wonder if the ORP value for model 314 is high! Besides, there must be a reason for adding 17% acid from a technical standpoint; I won’t go into details about that reason. Everyone should be aware of it. Changing the manufacturing process and its parameters in this way, I think, is not a good idea!
The main issue is not knowing exactly how much impact long-term exposure to 31% acid has on the membrane……
May I ask where I can find electrolytic cells that can be directly filled with 18% acid?
We simply use 18% high-purity acid and add it directly to the electrolytic cell. Firstly, the acid sent from the hydrochloric acid production section needs to have a concentration of 18% – that’s sufficient. We have been using these membrane electrode cells for half a year now.
Adding acid directly is also an option, but attention should be paid to the pH value at the outlet to avoid large fluctuations; it can be kept slightly higher. Additionally, pay attention to the purity of chlorine gas.
Actually, it’s also possible to use 426 without adding anything else; it’s not impossible to use 31% hydrochloric acid as well. The main issue is that using hydrochloric acid directly can cause damage to the electrolyzer and membrane in the event of an accident, due to the high concentration of hydrochloric acid.