Seek heat exchange materials resistant to hydrochloric acid, hydrofluoric acid, and nitric acid
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Materials that can withstand 31% hydrochloric acid, 40% hydrofluoric acid, and 40% nitric acid are required; the mixed acid needs to be heated to 80°C, and it is preferable to use coiled tubes inside the reaction vessel. Thank you
Is the ratio of mixed acids fixed? Are there any requirements for the heat transfer coefficient?
The proportions are roughly 180 kilograms of hydrofluoric acid, 300 kilograms of hydrochloric acid, and 100 kilograms of nitric acid. The material used must be able to withstand corrosion; the heat transfer coefficient depends mainly on the heating time. As long as it’s a metal material, there shouldn’t be any problems. It’s pointless to spend half a day preheating materials that weigh tens of tons
For coiled tubes, use plastic tubes such as PFA/PVDF/PTFE. This liquid is similar to aqua regia, and almost no metal can withstand it. If using tube bundles, SIC tubes can be considered
Thank you, but 40% of my material consists of such components, and both pumping and mixing cause wear on the coating
I checked relevant information and didn’t find any mention of heating three types of acids together... It is recommended to use polymer coatings, use all plastic materials, or conduct metal corrosion tests instead
Try using Hastelloy 276 or C22; if that doesn’t work, give Hastelloy B3 a try.
Do you have any experience in applying this in such contexts?
Teacher Wang, we have practical application cases of hydrofluoric acid systems
If there are any use cases in this area or similar situations, it would be good to have a thorough discussion with the owner.