Material selection for chemical engineering equipment:
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Materials contained in the reactor: large amounts of pentafluorobenzonitrile； A small amount of water ； Large amount of 98% concentrated sulfuric acid ； A small amount of acetic acid ； The final concentration of sulfuric acid is around 80% ； A small amount of fluoride ions remain after the reaction, and the reaction temperature is below 200 degrees Celsius ； positive pressure reaction ； Please help me recommend some materials ； That is, what material is more economical and reasonable to use for the reaction vessel? ；
This temperature is a bit high; it’s difficult to choose a suitable metal material
Under such conditions of medium, temperature, and slight positive pressure, it is recommended to use glass-lined equipment; the outer cylinder can be made of carbon steel while the interior is lined with enamel.
The enamel wore out; it broke after less than a year of use. Even with fluoride ions present, the enamel still didn’t hold up；
Consider using a fluorinated lining inside the direct enamel coating; heat transfer might be slower, but the impact isn’t significant, so it’s worth considering.
If funding permits, should Hastelloy C-276 be considered? Its corrosion resistance should meet the requirements
Is your reaction an endothermic one? Does it need to be cooled? For non-metallic materials, the main options are PTFE, enamel, and PFA in spray-coated form ； 1. The PTFE-lined material (with a thickness of 4 mm) has a high coefficient of thermal expansion at such high temperatures, and it is not easy to cool it externally (PTFE has a very poor thermal conductivity, resulting in long heating or cooling times) ； 2. Coating with PFA (thickness 0.8 mm) provides resistance to fluorine and high temperatures, and its heat transfer coefficient is much higher than that of tetrafluoroethylene-based materials ； 3. Enameled glass (with a thickness of around 2 mm). Enameling involves silicon, and there is a specific formula; it is created by grinding to form a glaze. Putting fluoride ions aside, enamel is the best choice ； A smear test can be done; it depends specifically on your fluoride level, or whether it’s possible to remove fluoride during the reaction process There's time to chat! 77390271 World--Signs
Hastelloy C-276 is a safer choice
Current corrosivity tests in progress ； Hastelloy 276 also doesn’t work; corrosion is significant ； Hastelloy B3 is acceptable, but it is not cost-effective. The most desired solution at present is fluorine-lined.
Hello, you can choose an enamel-lined reactor that can withstand high temperatures and chloride ions. There are only three companies in the whole country capable of doing this: Fadel, Nanjing Zhengyuan – all others are not suitable. You can add me on QQ at 260050607