Guys,
I'm struggling with SO3/H2SO4 Emissions in the offgas of a sulfuric acid production plant (double contact, 98.5%, sulfur burning).
What kind of emissions will I find in the offgas? Certainly acid mist (depending on efficiency of the mist eliminators located at the last absorption tower). Acid mist means extremely fine LIQUID particles, right? In addition there should be gaseous H2S04, right? And I believe that mist eliminators does not filter gaseous H2SO4, right?
According to Perry's handbook the partial pressure of H2SO4 over aqueous sulfuric acid (98.5%) is approx. 6.5E-6 (T=80°C, p =1 bar)
Is it correct to calculate the mole fraction of H2SO4 in the gas phase by using y_H2SO4 = p_H2SO4/p? Or is this incorrect because sulfuric acid solution is strongly non-ideal?
Assuming the above mentioned calculation of the amount of gaseous H2SO4 is correct. This should be a physical limit for lowest emissions? Or am I making a mistake in my thinking here?
Btw.: If anyone knows where to find more accurate data, please let me know.
Thanks a lot!
Jon