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Hydrogen Blanketing In Selective Hydro-Desulfurisation Unit


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#1 pallavikhatri

pallavikhatri

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Posted 29 February 2016 - 12:59 PM

Dear All

At present I am working on a Selective hydro desulfurisation unit using Axens technology. In the desulfurisation unit, the naphtha feed surge drum is blanketed with hydrogen. 

I just want to ask in what scenario hydrogen is used as a blanketing medium? In the hydrodesulfurisation unit why cannot we use nitrogen instead of hydrogen as a blanketing medium?

 

Thanks in advance.

Regards

Pallavi



#2 shantanuk100

shantanuk100

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Posted 19 March 2016 - 10:01 PM

Dear Pallavi,

 

1. Hydrogen is a part of the Hydrodesulfurization process. It is a basic reactant in it.

 

2. Nitrogen might contain associated substances which are likely to cause catalyst poisoning. It could be due to Oxygen, CO, CO2 or any similar substance.

 

3. In the HDS process, the outlet of the Gas separator and the Stripper units, is sent to an amine contactor for Sour to Sweet gas conversion. The exit from this unit is Hydrogen rich H2S free gas which is sent back as a recycle loop.

 

Due to these 3 reasons, you choose H2 as your gas blanket in place of N2

 

Regards,

Shantanu Kallakuri


Edited by shantanuk100, 19 March 2016 - 10:02 PM.





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