Seeking advice on the selection of heat exchangers for fluorine-containing materials
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The production process involves using ferrous chloride and chlorine to produce ferric trichloride. Since the ferrous chloride used as raw material contains 0.1% hydrofluoric acid, plate-type titanium alloy heat exchangers have already begun to corrode under these conditions, with temperatures reaching up to 70°C. I would like to ask the experts at Haichuan: what type of material should be used for the heat exchanger? Thank you
Perfluorinated materials have poor thermal conductivity; unless perfluorinated capillaries are used inside the reactor, but currently external plate heat exchangers are employed
The heat transfer coefficient of tetrafluoride is not high. But your medium contains hydrofluoric acid
Yes, there are advantages and disadvantages; I wonder if there is a better material to use
If the pressure is high, it is not appropriate to use a PTFE heat exchanger, unless a lining is used； It is uncertain whether Hastelloy can meet the operational requirements.
The pressure is basically at atmospheric pressure; in our current design, external plate heat exchangers are used, so it’s best to avoid replacing the reactor
Spraying PFA is a bit expensive; F40 can be used for spraying instead