Im confused because some references take anhydrous hydrogen chloride as a corrosive gas but some of them take it neutral. if it is corrosive, what materials can resist high temperature corrosion of anhydrous hydrogen chloride at 400 °C?
Some possible options: Inconel 600, Nickel 201, Hastelloy B (also B-2 or B-3), Hastelloy C (also C-4), Incoloy 800 (also 825), Chlorimet 2, or equivalent alloys; nickel, tungsten, graphite, fused silica.
Attached is the safety data document of anhydrous hydrogen chloride gas.
This gas is toxic when inhaled in a high dose while continuous exposure to low concentrations will harm the human's respiratory system.
Those, who considered it neutral in its effect, possibly meant the ions of hydrochloric acid aqueous solution (the hydronium ion & the chloride ion) but this acid is harmful as well even though it is present in the human's stomach.
http://hiq.linde-gas.com/en/images/Hydrogen%20Chloride%20SDS%20Linde%20EU%20format%20HiQ%20Jan%202011_tcm899-92360.pdf
Dear Carlos,
If there is any leakage of humidity, do your suggestions will work properly?
I mean as you know there is not 100% anhydrous hydrogen chloride and somehow moisture will be present even 1%. so in this case does your suggestion still works?
The materials suggested at my previous post for hot dry hydrogen chloride gas could also be selected for hot humid (non-condensing) hydrogen chloride gas. Corrosion of those materials by hot HCl is not expected to be greatly enhanced by moisture due to high temperature, but can be significantly greater (than for dry gas) below the water dew point and for high pressure (high H2O partial pressure).
please check the attached data sheet
https://www.niacet.com/wp-content/uploads/MSDS-Anyhdrous-HCl.pdf
Dear Carlos,
Can you please lead me about proper material or coating&lining for a container of aquas HCl 45% at 100 °C and pressure of 15 bar ?
For pressurized 45 wt% HCl (100 ºC) you could consider some more options, besides those previously suggested at my first post (except nickel and Nickel 201): Chlorimet 3 (or equivalent) alloy; zirconium, tantalum, impervious graphite; either polytetrafluoroethylene (PTFE), phenolic resin, or compatible rubber lining (e.g. neoprene); porcelain, compatible type of glass (or glass-lining), compatible acid-proof tiles, furan resin based mortar.
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