Seeking help with issues related to hydrogenation refining reactors
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When replacing the catalyst in the hydrorefining reactor, a grayish-white, cement-like substance was found adhered to the inner wall; it could not be scraped off with hands and was quite hard. The more intense the temperature, the more of this substance appeared in the lower sections. What is it and how did it form?
I’ve encountered that too; no qualitative analysis was done. I think it’s polymerization and coking in the high-temperature area, along with metal oxides remaining after the coking process.
Is it possible that the temperature on the inner wall is too high, leading to other side reactions that result in coking?
This possibility is low; the operating temperature has always remained within the specified range, with no occurrences of overheating or abnormal temperature rises
Has the hydrogenation reaction catalyst undergone pretreatment with an alkaline solution, or is there a trace amount of alkaline substance present in the material? ? ? If replacement is involved, is sodium nitrate used during deactivation? ? ? ?