Principle of color change in the electrolyzer outlet hose
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This post was last edited by sunjl1981 on 2013-1-6 at 23:25. Everyone knows that when the ion exchange membrane leaks, the hose at the anode outlet turns pink, purplish-red, or transparent. Does anyone know what the principle behind this discoloration of the PFA hose is? ? # + + .
This is related to the position of the pinhole: if it is in the middle or lower part, caustic soda will leak to the anode side; NaOH + Fe3+ = Fe(OH)3, which is why the color of the output material is pink or purplish-red. If the pinhole is in the upper part, although there is internal circulation, the gas content in that area remains relatively high. When caustic soda comes into contact with chlorine, it reacts to form colorless sodium hypochlorite and sodium chloride, so the color of the hose becomes lighter or transparent.
Pinholes appear on the membrane, or the parameters of the brine fed into the tank are not up to standard.
Possible causes: 1. Excessive iron ions in saline water; 2. Excessive iron ions in high-purity acid; 3. Iron ions resulting from pipe corrosion entering the circulation system; 4. Crushed resin entering the system; 5. Excessive iron ions in diluted pure acid and pure water. If the levels do not remain high, they may return to normal after some time, or you can check the forum posts at http://bbs.hcbbs.com/viewthread.php?from=notice&tid=761164
Ask for the principle: L. As explained on the second floor, before power is supplied to the circuit, if there are no abnormalities observed in the hose, what is the explanation for that?
Study* study!* ~~~~~~~~
Thank you for your guidance. I’ve learned something new – I always knew that hoses would change color, but I didn’t know the reason behind it
This phenomenon is quite rare, right? Normal ion membrane leaks do not cause the overflow tube to turn red, unless the leak is severe and persists for a long time. The product formed by the reaction of the alkaline solution at the cathode side with ruthenium dioxide in the anode coating on the anode side is red-brown in color. I think that’s the case. Or rather, it’s a possible scenario. Generally, if discoloration occurs, the vehicle should be stopped immediately to replace the film; otherwise it’s too dangerous!
Learned*..................