Material selection
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The last edit to this post was made by Yantai on 2015-6-10 at 11:01. The design parameters for a tower are as follows: design pressure: 0.88 MPa; design temperature: 200 degrees; operating media: water, hydrogen sulfide, hydrogen chloride, organic solvents, and dry gas. The material selection required by the process engineering department is carbon steel lined with polytetrafluoroethylene； However, it already exceeds the standards specified in HG20536-93. What should be done with this equipment? Manufacturers are welcome to get in touch directly or send relevant information. QQ: 778651
Hello, we are a manufacturer specializing in the production of fluorine-lined equipment. Please take a look at your information.
The design temperature is 200°C, at which point polytetrafluoroethylene is almost at its critical condition; it is best to use PPL lining made of polyphenylene
Could a student on the 3rd floor recommend a book that discusses the properties of PPL polyphenylene?
This material is relatively new; it’s actually an enhanced version of PTFE (polytetrafluoroethylene). You can look it up on Baidu or ask the manufacturer. SORRY
Titanium cannot be used; it’s not a pressure issue – titanium cannot withstand hydrogen chloride containing water at these temperatures and pressures. It could even be severe salt-acid corrosion.
I checked some books; titanium is not very resistant to salt and acid corrosion either, so a corrosion inhibitor needs to be added