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Flue Gas Desulfurization By Ammonia

desulfurization ammonium sulfate scrubber

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#1 Mahdi Malek Alaie

Mahdi Malek Alaie

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Posted 22 January 2019 - 07:14 AM

Dear All,

 

The aim of a Flare Gas Recovery Unit of a petrochemical complex is converting of H2S (17.5 %wt) in flue gas to Ammonium Sulfate (commercial-grade). The process includes three stages:

 

1- Sweetening Unit

2- H2S Oxidation Unit (Converting of H2S to SO2)

3- Producing of ammonium sulfate from SO2 by ammonia scrubbing.

 

The first and third technology is clear for me. However, we have no idea about the second stage.

What is the conventional method for converting of H2S to SO2 in this regard?

I know the Claus process as be used in conventional SRU unit, but i am not sure about the applicability of this in this case.

Is there any industrial method for direct converting of H2S to ammonium sulfate without oxidation (SO2) ? 

 

Thanks.



#2 Technical Bard

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Posted 23 January 2019 - 06:34 PM

H2S would be combusted to SO2 in a burner, blended with fuel.  in order to make sulfate you need SO3.  (NH3 + H2O+SO3 = NH4SO4).   This can be achieved by burning SO2 over a catalyst to get the further oxidation state.  Alternatively, you could make NH4SO3 and oxidize it further with H2O2 or oxygen by my understanding.

 

You want to make sure the ammonia is pure - I know of a plant that did this and discovered at started the ammonia contained some amines (it was recovered from a refinery) which resulted in some very nasty smelling stack gas






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