Concentrated hydrochloric acid reaction kettle
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36% concentrated hydrochloric acid, 95°C, closed reaction. A glass-lined reactor (design pressure of 1.0 MPa) is planned to be used ； After heating, wet hydrogen chloride gas is present in the gas phase; therefore, it is advisable to use enamel or PTFE for the gas-phase pipes and valves. The diaphragm of the pressure gauge should be made of Hastelloy, and the rupture discs and their accessories should also be made of C276. Is this approach reasonable? Additionally, the mixing mechanism in the enamel-lined tank uses double-end mechanical seals – could there be any issues with the corrosion resistance of these mechanical seals?
It’s fine to use valves with an F46 lining; I’m not familiar with mixing processes
Everything else said is correct. This is a positive-pressure reaction; mechanical seals need to take pressure into account, and mechanical seals with a pressurization system should be used.
If money isn’t a concern, use all tantalum material – then there will be no worries in the future!
Nitrogen filling might also be considered for the mechanical shaft seal section.
The C276 material for rupture discs is suitable; if the diameter is too large, it is recommended to apply a anti-corrosion coating to the rupture disc, as a larger diameter entails higher costs
The mechanical seals designed for enamel equipment use materials such as PTFE, graphite, and silicon carbide – all of which are highly resistant to corrosion – so there will be no problems with these seals. A design pressure of 1.0 is considered quite high; careful consideration should be given to the mechanical seal, and its pressure resistance needs to be verified with the supplier.