What to do if an enamel kettle is corroded due to a reaction with hydrobromic acid, sulfuric acid, and n-butanol?
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0.45 of hydrobromic acid (48%), 0.1 of water, 0.21 of sulfuric acid (98%), and 0.24 of n-heptanol (99%) are placed in an enamel reactor for reaction at a temperature of 140°C under normal pressure. Why does corrosion always occur in enamel reactors?
It’s not clear what triggers the reaction; maybe it’s due to prolonged use or a change in material
The enamel surface coating is prone to peeling and chipping; when local corrosion protection fails, the material becomes susceptible to corrosion
Enameled surfaces may be sensitive to temperature; the higher the temperature, the greater the corrosion
The heat shock resistance of enamel in enamel-lined reactors is generally around 100 degrees Celsius. Is it necessary to cool the reactor after the reaction is complete?
There are so many types of enamel, and it’s impossible for all manufacturers to produce products of equal quality; choose a high-quality manufacturer. You can also consider using PTFE lining
Is there a trace amount of fluorine mixed in the material? The components and temperatures you listed should be sufficient for the enamel to withstand it.
Our factory uses 130°C, 70% sulfuric acid; Wuxi Dedisi enamel tubes have been in use for 2 years with no major issues. The DN25 tube that was just removed has enamel loss on its flange surface
We previously had a working condition involving 70% sulfuric acid, 20% nitric acid, and other substances, at a temperature of 165°C and at atmospheric pressure; even the Degussa enamel failed in such conditions. Later, it was changed to PFA spraying, and the results were good. Of course, you can also try PTFE.
No forced cooling; natural cooling and precipitation
140 degrees; at least 6 clamps are used. Is it because the steel plate is too thin, resulting in excessive pressure that causes the plate to deform and the enamel to peel off?