What material is suitable for a reactor resistant to hydrochloric acid at normal temperature and pressure?
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This post was last edited by bmcc20033 on 2010-12-12 23:22. It involves a reactor capable of withstanding hydrochloric acid (pH 1.6) under normal temperature and pressure. This reaction is rather special: hydrochloric acid is produced during the reaction but cannot be neutralized; it is necessary to use liquid nitrogen, which should be added without coming into contact with the reactor walls, in order to stir high-intensity powders (similar to iron powder) at high speeds. What material would be suitable for this purpose?
Enameled reactors or those with a steel lining covered in PTFE are both suitable, as they can resist corrosion by hydrochloric acid.
Reply to 1# bmcc20033: There’s no good solution! It’s not a problem of corrosion resistance; the key issue is that the friction caused by the rapidly rotating iron powder cannot be resolved. Advanced alloys are corrosion-resistant due to an oxide film; however, they are not effective in such environments. Equipment with a PTFE lining is one option; another approach to try is to have the manufacturer design the enamel coating to be made of microcrystalline porcelain in order to improve the wear resistance of the ceramic layer. The bottom part of the tank is where friction is greatest, so lining it with wear-resistant tiles would be a good solution. I used this method before when repairing the reactor for ferrous chloride.
Stainless steel with polytetrafluoroethylene coating. I think what hgtcxl said is quite good
Thank you all, but can the PTFE lining withstand the friction from hard powders without coming off? And perfluorine will affect heat transfer, right? This reaction requires rapid heat removal.
Graphite lining or PTFE lining can be considered; 0538-8577779
A post from five years ago is still useful to me now
The enamel kettle is lined with graphite bricks, while the bottom of the kettle is lined with silicon carbide bricks. A highly successful application example that has been in use for over a decade.