Methanol vapor compatibility with PTFE
Methanol vapor compatibility with PTFE
(OP)
I am building a prototype of an invention that reforms methanol to hydrogen at 120 Celsius, and would like to build (machine) it out of PTFE or PFA. Does anyone have any idea of the limits of PTFE and/or PFA for methanol:steam mixture (1:1.25 molar ratio) at 120-150 celcius?





RE: Methanol vapor compatibility with PTFE
PTFE and PFA are definitely compatible with methanol vapour at these temperatures as seals and linings. But both materials have a tendency to "creep" or cold flow under these temperatures to a degree dependent on the mechanical design of the device in question. And neither is adequately strong for direct pressure-bearing service at these temperatures.
RE: Methanol vapor compatibility with PTFE
RE: Methanol vapor compatibility with PTFE
You would be better off to cut the the teflon thickness down to 1/4" or less and use steel or stainless steel to create the pressue boundry.
IMHO
StoneCold
RE: Methanol vapor compatibility with PTFE
John
RE: Methanol vapor compatibility with PTFE
If your plates are retaining pressure and exposed to these temperatures, get the help of a mechanical engineer to design this. Use a metallic material as the pressure boundary for sure.
RE: Methanol vapor compatibility with PTFE
Thanks again.