Suitable material for high temperature phosphoric acid
Suitable material for high temperature phosphoric acid
(OP)
I'm looking for a material that can stand up to high temperature phosphoric acid. And by high temperature, I'm talking up to 500C, atmospheric pressure.
I doubt there's a metal that'll do, but thought I'd ask. Ceramics are a possibility, too. I'm leaning towards quartz right now. There are definitely issues with quartz, but I'm not finding anything else that looks even remotely suitable.
Any suggestions?
Thanks
I doubt there's a metal that'll do, but thought I'd ask. Ceramics are a possibility, too. I'm leaning towards quartz right now. There are definitely issues with quartz, but I'm not finding anything else that looks even remotely suitable.
Any suggestions?
Thanks





RE: Suitable material for high temperature phosphoric acid
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hope this help u
S
Corrosion Prevention & Corrosion Control
RE: Suitable material for high temperature phosphoric acid
RE: Suitable material for high temperature phosphoric acid
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Suitable material for high temperature phosphoric acid
The dryer oven were 316 SS lined and the sintering ovens were also 316 SS.
There was never any corrosion noted.
Sjones,
I believe they will have a mixture of pyro and meta phosphoric acid at thie temperature and i would favor the meta form along with some P2O5.
RE: Suitable material for high temperature phosphoric acid
The idea of the process is to heat orthophosphoric acid, and use the P2O5 vapor generated.
I've been using this brochure from the Potash Corp as a reference:
http:
Figure 12 in it implies that boiling phosphoric gets more concentrated and generates a higher percentage of P2O5 as vapor up to pretty high temperatures (the graph goes to 800C), and at atmospheric pressure. That sounds a bit fantastical to me, especially considering what you describe, Unclesyd. Is their info wrong? Or is something else going on? The listed figure is based on an old paper prepared for the TVA, and I've tracked it down, should have a copy in a day or two.
I'm trying to test some of this. I can get the temperatures I need in a test rig I've built, but I haven't a clue what material to make a vessel from, which is why I'm here.
RE: Suitable material for high temperature phosphoric acid
The boric acid is a reaction promoter and also a dehydrating agent in the catalyst.
The chemistry of catalyst wasn't ever studied in depth as if the compound was right there was a high selectivity and yield in the process. Aside from the complexity of the chemistry the analytical techniques were severely lacking.
Immediately prior to shutting down this process I found out that this catalyst could be regenerated by running it though a Pyrolysis oven. This would burn off the carbon and dehydrate the phosphoric and boric acid.
The chemistry of catalyst wasn't ever studied in depth as if the compound was right there was a high selectivity and yield in the process. Aside from the complexity of the chemistry the analytical techniques were severely lacking.
RE: Suitable material for high temperature phosphoric acid
RE: Suitable material for high temperature phosphoric acid
I'm hoping to extend that lifetime. I'm also hoping to win the lottery. The more I learn, the more I see that might be the more likely scenario....
RE: Suitable material for high temperature phosphoric acid
http://www.mtiproducts.org/maseforhachm1.html
MTI MS-7: Phosphoric Acid