Why are the indicators for sodium carbonate in ion-exchange membrane caustic high? ?
Thread Content
This post was last edited by sunjl1981 on January 6, 2013, at 20:31. I would like to ask all the experts: What could be the reason for the excessively high level of sodium carbonate in ion-exchange membrane caustic soda? ,,, -
Is it that too little acid was added to the anode solution, or is there a problem with the pH meter such that carbonate ions weren’t removed?
Is the OP referring to solid caustic soda or liquid caustic soda? During transportation, storage, and handling, strongly alkaline substances absorb carbon dioxide as soon as they come into contact with air, resulting in an increased content of carbonate. This is what happens with all strong bases.
Reply to 3# qugd: Caustic soda solution... 32% caustic soda solution... We took a sample at the outlet of the single-tank cathode solution; the sodium carbonate level was high..
Reply to 2# gaoyingxuan26: Hello! Thank you for your reply. Which location do you mean by the pH meter? ?
Reply to 5# leileiheart: The processes in our two plants might be different. Before the liquid enters the anode tank, we add acid to keep the pH level at around 3–6; this is done to remove carbonate ions. In the anode tank itself, acid is added to maintain a pH level of 1.5–2.5; this helps reduce oxygen production, ensures the purity of chlorine gas, and also protects the electrolytic cell.