I have a question regarding the corrosion protection of brick-lined reactors in hydrochloric acid media
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There is a reactor operating in hydrochloric acid medium, with a hydrochloric acid concentration of 20% and a reaction temperature of 110°C (the presence of chlorides results in a boiling point higher than that of pure hydrochloric acid); a reactor lined with steel for corrosion protection is planned to be used. Preliminarily considered lining anti-corrosion solution: pre-vulcanized butyl rubber is applied as a lining inside the steel shell, followed by the use of acid- and temperature-resistant ceramic plates or tiles. One issue is that the temperature that butyl rubber can tolerate for an extended period should not exceed 100°C. How thick must the brick layer be to ensure that the temperature reaching the butyl rubber layer is below 100°C, for example, 90°C? It involves the calculation of the thermal conductivity and insulation thickness of acid-resistant ceramics. It would be best if there is a formula; if not, empirical data will do as well.
It is sufficient to use impermeable graphite bricks as a lining inside the enamel kettle; even if the existing enamel kettle has experienced enamel cracking, it can still be used after lining it with graphite bricks.
Reply to 2# Wang Genrong: Since it is a liquid-solid phase stirring reaction, graphite sheets seem unsuitable for use as lining in this application; therefore, acid- and heat-resistant bricks/plates are planned to be used instead. Additionally, the equipment is large in size and cannot be lined with enamel.
With both chloride ions and a high-temperature environment, it is recommended to use a graphite reactor. If there are successful experiences, the configuration on the upper floor can certainly be chosen. The largest glass-lined equipment available at present is 50,000 liters – I wonder if that’s large enough?
Please go to the specific section on 51fangfu to discuss this topic in depth. Acid-resistant brick slabs are bonded using acid-resistant mortar that is also heat-resistant; if necessary, an isolation layer is added as well
Reply to 3# Nonsense under the influence of alcohol: Whether a graphite lining can be used depends on factors such as the content of solid substances, particle size, hardness, and stirring speed; it cannot be generalized. For example, with a 10% content of 60-mesh iron powder, a graphite lining can be used fully at 50–60 revolutions per minute.
You can take a look at those with steel lining and PTFE! It can withstand temperatures of 180 degrees and has excellent corrosion resistance! ! !
For reference, I’ve been dealing with a reactor for HCl gas recently, and I’m considering what materials to use.
Reply to 9# zzu340: The most suitable material for reactions involving HCl gas is impermeable graphite. Devices such as hydrogen chloride synthesis furnaces, hydrogen chloride condensers, hydrogen chloride absorbers, exhaust gas absorption towers, hydrochloric acid regeneration towers, and so on, are all made of graphite.