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Hydrogen Recovery From Hydrogen-Lean Streams

psa hydrogen recovery

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#1 daraj

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Posted 05 July 2016 - 05:39 AM

Hi, your inputs are greatly needed.

 

for H2 recovery using PSA, generally feed concentrations of h2 in excess of 50mol% or so is preferred. For hydrogen-lean feeds (conc = 15-20 mol% h2) having mostly methane and nitrogen, are there reliable commercially demonstrated systems for h2 recovery? I have heard of vacuum swing adsorption as well as membranes-based. Latter have some issues with respect to costs and scalability.

 

Please ponit me to some references where such lean stream h2 recovery separation systems have been commercially employed. The application is needed for  a petrochemical process.



#2 Pilesar

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Posted 08 July 2016 - 09:42 AM

It will probably take a large quantity of H2 for a commercial system to be economical. In an olefins plant, hydrogen recovery typically uses a cryogenic process to first concentrate the hydrogen so swing absorption can be effective. Research demethanizer chilling train.



#3 daraj

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Posted 25 July 2016 - 04:52 AM

Thanks Pilesar.

 

any other inputs?



#4 gegio1960

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Posted 26 July 2016 - 11:33 PM

what about your contminants and the pessure of this stream?



#5 daraj

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Posted 07 August 2016 - 11:47 AM

Hi gegio, "contaminants" are mostly light hydrocarbon gases like CO2, CH4, C2s etc.

Pressure= 5-8 bar



#6 gegio1960

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Posted 09 August 2016 - 03:38 AM

it seems you have all of the possible contaminants (N2, CO2, light HCs) and a quite low pressure.

it will be a complex separation but w/o compositions it's impossible to say more.

the most similar situation I can imagine is a ROG (Refinery Off Gas) plus CO2: so the solution could be Amine Washing + Compression + PSA.






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