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The Required Purity Of N2 As Regeneration Gas

lpg polishing n2 mol-sieve

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#1 irprocess

irprocess

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Posted 07 October 2012 - 04:32 AM

Hi Everyone,

In our project, LPG polishing with molecular sieve; we decide to regenerate beds with hot nitrogen, but I have a concern about the purity of nitrogen in this system, as three substances (remained hydrocarbon on the surface of mol-sieve, high temperature and low ppm of oxygen) are present in bed and maybe a hazard to be occurred during regeneration.
I want to know about the required nitrogen in order to be in safe side.

Nitrogen is obtained by PSA.

Regards
irprocess

#2 Bobby Strain

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Posted 07 October 2012 - 11:02 AM

First check with the molecular sieve supplier.

Bobby

#3 Art Montemayor

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Posted 07 October 2012 - 11:38 AM

irprocess:

Bobby Strain’s response is not only the correct one, but it addresses the basic, common sense approach that all engineering solutions should employ. I allow myself the liberty of digressing into more detail on this and other related engineering problems:
  • It is only natural that you should not contemplate using someone else’s product without first consulting with them on what you intend (or wish) to do with their product. You are not the expert on adsorbents. If you were, you would be fabricating them. There may be limitations and safety issues involved in what you may propose and the only way to make sure you don’t overstep the limitations on the proposed adsorbent is to consult with those that designed and fabricated it. Put the responsibility and accountability for the correct design criteria on those that know best.
  • Be prepared to submit complete and detailed basic data to the manufacturer. Your query and concerns can only be addressed in quality and quantity to the degree that you supply ALL of the necessary basic data – and scope of work. What is the complete composition of your regeneration nitrogen? Is it a product of air separation, membranes, adsorption, or a combustion flue gas? What is the complete NEMA cycle that you propose to use for the regeneration, how often, and at what temperatures and pressures imposed on the adsorption beds? What is (are) the undesired components adsorbed on the adsorbent’s surface? What will be the temperature to which you will cool the bed(s) and renew adsorption?
In other words, make every effort to give the manufacturer every bit of information that will allow them to accept the accountability for predicting the performance expected of the product molecular sieve. You will find that the major manufacturers will gladly assist you in selecting and applying the correct regeneration cycle and procedure for your application.




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