Material selection issues in high-temperature sulfuric acid environments
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Current status: At present, we need to preheat dilute sulfuric acid in a storage tank to around 60 degrees Celsius. The heat source is 4 bar of steam, and the concentration of sulfuric acid is approximately 8%-10%. Previously, the veterans used titanium heating coils, which have corroded and broken. Question: Because the heating coil is immersed in sulfuric acid, and the wall temperature of the coil is high. Most metal materials cannot meet the requirements. Tantalum, Hastelloy, etc. are too expensive, and non-metallic coils have also not been seen. I would like to ask the experienced professionals if there are any other alternative materials that can be used in a high-temperature sulfuric acid environment. It’s best to have practical experience
4 kilograms, steam temperature of about 150 degrees Celsius
316 won’t work; titanium is only acceptable at a concentration of 5%, as corrosion accelerates above that level.
2507 and 904L should meet your requirements; feel free to message me if you have any questions
We use PTFE-lined tubes or pure PTFE tubes for acid concentration processes
Graphite pipes can be considered, but the brittleness issue is a concern.