Discussion on the blackening of water from the atmospheric pressure tower top
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Water is taken from the solvent oil reflux tank in a normal-pressure system; the water quality is dark and contains black substances. The situation improves after filtration. What is causing this? Also, emulsification can occur in the discharged water sometimes; how can this be resolved?
Corrosion at the top of the atmospheric pressure tower leads to an excessive level of iron ions, causing the water quality to turn black. Is no corrosion inhibitor being added at the vaporization line at the top of the tower?
A corrosion inhibitor was injected at the top of the tower; the pH is relatively low, ranging between 4 and 5.
It is advisable to keep the pH value of the water at the top of the tower between 6 and 9
No ammonia to be added? Organic amines? The three injections at the top of the tower must be carefully controlled; otherwise, corrosion and leakage problems are likely to occur in the tower’s cooling system
There is no separate ammonia addition; organic amines and corrosion inhibitors are included in the corrosion inhibitor mixture. Isn’t such an effect not as good as adding ammonia separately?
Has the problem been solved? Could you please describe your operating conditions?
If the water turns black, it’s definitely because the corrosion inhibitor used is not suitable. Plus, with a pH level of 4-5 as you mentioned, it would be strange if there were no problems. Use Jiangsu-based pyridine-based corrosion inhibitors or those supplied by agents for acidification and corrosion prevention; there are also transparent corrosion inhibitors designed for use by higher-level managers. The overall market situation is poor – everything is handled through bidding processes that result in one-time deals. Who will end up taking the blame next time? One can only take precautions to ensure their own safety. A haha is enough. What was said upstairs is all correct – the pH level should be kept between 6 and 9. It’s normal for the water to turn black in the absence of organic amines and imidazolines. One can only say that people these days are becoming more and more bold and ruthless.
Emulsification occurs because the corrosion inhibitor components contain surfactants, and changes in operating conditions can sometimes lead to emulsification. If the water turns black, it’s certain that the product is fake; if the water remains white, then it’s fine.
Thank you for your answer. May I ask how to fake the water-darkening agent? What caused it? The medication itself isn’t black