Is there any particular solvent which can selectively remove H2S from ammonia?
As amine solvents cannot be used for H2S separation because ammonia is present which will create a problem fro amine regeneration. Other than that, strong acid for NH3 absorption can be used but still NH3 recovery will be difficult.
So any other solvent (physical or chemical) that can be used for selective H2S removal from NH3 or solvent that can selectively remove NH3 from H2S which can be regenerated further.
I have already tried with solvents like - DEPG, NMP, ethylene glycol etc. but all these are having affinity for both, so it is becoming difficult to separate.
Open to suggestions!1
Hydrogen sulfide is a weak acid, but is acid ammonia is alkaline, perhaps and alkaline solution as NaOH can retain H2S. Even water, since H2S solubility is higher than ammonia, but it depends on the H2S concentration in ammonia, bu you will loose some ammonia.
Perhaps the following reference might help you.
10.1080/10473289.2001.10464265
If you have flow of gas containing NH3, H2S and some water, probably you can separate ammonium sulfide (solid) on cold surface.
It is important to know exact composition of gas to predict sulfide behavior.
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