Phosphoric Acid

[sarahr]

I need to set up an experiment that will use 1-5% Phosphoric Acid Solution at a temp of 180F and pressure of 2000-4000 psig. Does anyone know the H3PO4 will gas-off at these conditions or will it be negligible? (i need to figure out if i need to modify our current vent down conditions or if our current set-up is acceptable)

any help at all on this would be appreciated, even if its just a suggestion on where to begin looking.

Thanks!

 

[IRstuff]

Hot phosphoric was used for aluminum etching in ICs. Can't remember conditions or concentrations, but this was always done in a fume hood with a scrubber at the other end.

TTFN

 

[StoneCold]

I can guarantee that the vapor pressure of the phosphoric acid is less than 2000psi. Is that what you are asking?

 

[nbucska]

H3P04 was used to "glue" the phosphors to the inside
of the neon tubes ( around 1980 ) The pressure was
a few mm. Hg -- evidently the vapor pressure or H3P)4 is much less.


Plesae read FAQ240-1032
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