The problem of acid addition to the anode solution in ion-exchange membrane caustic soda production plants
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This post was last edited by sunjl1981 on 2013-1-6 23:39: Adding acid to the anode solution in ion-exchange membrane caustic soda production plants. Which acid is more suitable to add? Is it high-purity hydrochloric acid or by-product hydrochloric acid, etc.? This post was last edited by yzhms on 2008-3-5 22:07. ] # hcbbs
Ion-exchange membrane electrolyzers have very strict requirements regarding the impurities present in the anode and cathode solutions fed into them. Since the impurities in the by-product hydrochloric acid are relatively high, it cannot be used for acidification in ion-exchange membrane electrolyzers; instead, highly pure hydrochloric acid should be used.
Of course it’s high-purity acid; just need to get the concentration right
The acid added to the electrolytic cell should be high-purity hydrochloric acid. It’s not just a matter of getting the concentration right; rather, the amount of high-purity hydrochloric acid added must be controlled properly. :lol :lol
Of course, the fewer impurities, the better – a high-purity acid is preferred! It can also be used if the impurity content of the by-product acid is within the standard range! This post was last edited by yzhms on 2009-3-6 23:57]
Thank you all. I’m an outsider when it comes to this
It’s of course high-purity hydrochloric acid; to improve the anode efficiency, we set the pH at 1.3. This post was last edited by yzhms on 2009-3-18 at 17:50.]
It’s of course high-purity hydrochloric acid; it’s best to adjust its concentration to around 20% before use. Generally, there is a D320 storage tank used for holding the acid required for the electrolytic cells as well as the acid needed for the dichloromethane resin column.
There is no need to add acid in the early stages of ion membrane operation! Adding acid from the beginning is not very good for the membrane! A dry channel layer appears on the surface of the membrane! Furthermore, adding acid is to neutralize the OH ions that permeate back from the cathode chamber! Increase the chlorine concentration! On the one hand, it also has certain benefits for the anode pad! It’s best to avoid adding it as much as possible! Export acidity is at! 2.5—3 is best! If too much acid is added! Pinholes will appear on the membrane! It will acidify the membrane! This post was last edited by haining on 2009-3-6 09:03.]
Does anyone know? Why is the color of chlorine on the outlet hose of our tank anode so dark? There’s also a yellowish layer on the hose itself! How did it appear! Is it the iron ions in salt that are high? We use well salt! It’s Asahi Kasei’s natural circulation tank! I’ve been using it for almost three years! The flaws are gradually increasing! Chlorates also often exceed the limits! Is it time to replace the membrane? But replacing the membrane is too expensive!