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Design Of Desulphurisation Unit

hydrogen production zinc oxide bed hds hydrodesulphurisation steam methane reforming

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#1 cantaloupe123


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Posted 07 March 2020 - 09:16 AM

Hi there,


I am designing a desulphurisation unit composed of a hydrogenation reactor followed by two Zinc Oxide fixed bed reactors (1 operating and 1 regenerating).

I have the following feed composition:

90 % CH4, 4.5 % C2H6, 1 % C3H8, 0.45 % C4H10, 0.2 % C5H12, 0.9 % CO2, 2.95 % N2 and a maximum sulphur content of 50 mg/Nm3.
At present I have assumed the sulphur content is 5 mg/m3 is H2S and the remainder is mercaptan (CH4S).


How should I go about calculating the amount of hydrogen required to recycle to the hydrogenator? 


I know 100 % of the mercaptan will react but I am unsure which other reaction will take place.

Edited by cantaloupe123, 07 March 2020 - 09:31 AM.

#2 PingPong


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Posted 08 March 2020 - 04:37 AM

I think that I wrote about that somewhere in this topic: https://www.cheresou...reformer-unit/ 

#3 Technical Bard

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Posted 24 March 2020 - 10:44 AM

You will consume an equimolar amount of H2 to the RSH molecules.  With a hydrotreating catalyst, no other reactions should occur.  But you will need an excess of H2 to ensure you get a full reaction.  It is best to ask your catalyst supplier how much.

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