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Upstream Nitrogen Rejection Without Loss Of Methane

nitrogen nru nitrogen rejection unit upstream nitrogen treatment

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#1 mputupai


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Posted 25 January 2019 - 01:35 AM

Hi guys, 


Hope someone with experiences in Nitrogen Rejection Units can share some of his ore her experiences in removing nitrogen upstream of LNG Plant. 


We have a very marginal field with around 500 BCF gas with very high nitrogen concentration of 21% which is very expensive and cannot be fed to the LNG Plant system downstream. We tried blending in with nitrogen-lean gas from other fields to dilute the nitrogen content before hitting the LNG Plant inlet but still the nitrogen content is still high around 3-5% at maximum pipeline capacity. 


I am therefore wondering if there are some noble technologies out there with which can help reduce the nitrogen content. Note that cryogenic distillation in upstream fields is very capital intensive and not viable for small marginal fields as such. 


Any suggestions would be much appreciated. 




Michael Putupai

#2 Technical Bard

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Posted 25 January 2019 - 08:34 AM

There may be membrane solutions that can reject nitrogen from methane streams, but you will very likely lose some methane.

#3 Art Montemayor

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Posted 25 January 2019 - 02:43 PM



I welcome you as a new member and with your new post.  However, I have to advise you that posting multiple copies of the same topic in our Forums - whether it be in the same or a different Forum - is not accepted.  This causes a lot of confusion and robs our members of the opportunity to contribute information to you in one, concise, and dedicated thread.  Otherwise, they don't know which thread to respond to.  It also gives problems for our Search Machine.


Kindly read the Forum Guidelines on how what you can post in our Forums.  In the meantime I will have to delete one of the threads in the Industrial Forum and the other in the Oil and Hydrocarbon Forum.  Please let me know if you have any problems with this action.  We want our Forums to profit all our members with successful solutions and answers to queries and problems.

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