If the iodomethane content in acetic acid exceeds 4 ppm, which model should be chosen for stainless steel?
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If the iodomethane content in acetic acid exceeds 4 ppm, what type of stainless steel should be used? It would be great to have relevant specifications; you can send an email to bunll@Foxmail.com
It should act as a catalyst assistant in the carbonylation process, particularly in rhodium-iodine catalytic systems or iridium-iodine catalytic systems. Iodine has a significant corrosive effect on stainless steel; the original poster can consult those in the acetic acid and butyl octanol industries regarding the material choices for equipment, pipes, and reactors that come into contact with iodides. Iodine has a stronger effect on the corrosion of stainless steel than chlorine. The situation described by the poster may not be simply a problem with iodomethane; there is likely also an issue of corrosion caused by iodide ions. As far as I know, some patent holders for acetic acid recommend materials such as Hastelloy, zirconium, titanium, etc., with high-nickel alloys being the main choice.