I would like to ask what material should be used for pipes at 110°C that contain hydrochloric acid and hydrogen gas
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As the title suggests: It involves a displacement reaction that occurs when hydrochloric acid reacts with an inert metal at temperatures above 100°C. What material could be used for the exhaust pipe? The reaction vessel is an enamel-coated tank without a stirrer.
It is recommended to use ceramic-lined steel pipes; fiberglass-reinforced plastic pipes cannot remain at temperatures over 100 degrees for long periods, as this will cause carbonization
In many multi-effect evaporation systems using brine, fiberglass pipes are used, and the temperatures are well over 100 degrees Celsius, with no problems at all
Also, does this vent pipe necessarily have gas evaporating from it, or is it at normal pressure? It’s just that the temperature of the reactor is over 100 degrees, but the temperature of the gas in the vent pipe remains essentially at normal temperature
The vent lines mainly contain water, hydrogen gas, and unreacted HCL.
We considered steel-lined PTFE with internal copper wires, but after checking corrosion manuals, we found that copper is also not resistant to high concentrations of hydrogen chloride.
Then it’s better to use glass with a steel backing