Regarding the passivation issue of the solvent portion
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While investigating the on-site process, I noticed that there was a pipeline leading from the outlet of the solvent regeneration tower’s reflux pump directly to the air cooler. The technician said it was a passivation line, designed to prevent ferrous sulfide from catching fire during shutdown periods. I would like to ask what the passivation medium used for the tower is, and how it can be determined when the passivation process is complete I hope fellow sailors can give some advice!
Its passivation medium is a strong oxidizing agent; we consider those that are red to be potassium permanganate. The passivator itself is acidic (with a pH of around 4); during the passivation process, if using a pH test strip and the pH value no longer changes, it can be considered that passivation is complete. The passivator should be added gradually depending on the reaction progress, to avoid overuse; the pH value should be neutral once the reaction is complete.