OLD MOLSIEVE! IT IS OK TO USE?
OLD MOLSIEVE! IT IS OK TO USE?
(OP)
Hello all...
I have a dead stock of molecular sieve. It's been in my logistic warehouse since maybe 15 or 20 years ago, and i'm looking for any possibilities that i can still use it.
It is a 13X type molecular sieve with 1/16" pelleted grain size. I will using it for an absorption of H2O and CO2 and any hidrocarbon in air pretreatment before entering coldbox of N2 plant
What is the parameter for determining that the molecular sieve is still in good condition?
What kind of analysis that my laboratorium should run to that molsieve?
What is the ideal run time for a molecular sieve in operation since my N2 plant have never change its molsieve since 15 years? And what is the parameter for changing molsieve decision?
thanks before for your response
Devax Rayz,
Junior Process Engineer
I have a dead stock of molecular sieve. It's been in my logistic warehouse since maybe 15 or 20 years ago, and i'm looking for any possibilities that i can still use it.
It is a 13X type molecular sieve with 1/16" pelleted grain size. I will using it for an absorption of H2O and CO2 and any hidrocarbon in air pretreatment before entering coldbox of N2 plant
What is the parameter for determining that the molecular sieve is still in good condition?
What kind of analysis that my laboratorium should run to that molsieve?
What is the ideal run time for a molecular sieve in operation since my N2 plant have never change its molsieve since 15 years? And what is the parameter for changing molsieve decision?
thanks before for your response
Devax Rayz,
Junior Process Engineer





RE: OLD MOLSIEVE! IT IS OK TO USE?
RE: OLD MOLSIEVE! IT IS OK TO USE?
You can check the dew point of an air sample before and after exposing the sample to molecular sieves. Check Mr. Montemayor's post for a detailed description of the method at Thread1036-104873(there are dew point meters already available but they are expensive)
There is no rule, as far as I am concerned, for replacing molecular sieves. You can use them as long as they are not contaminated with oil nor mechanically detiorated(your final dew point will tell you whether they are good or not). My experience is that we have to top up atleast 5-10% every year.
Regards,
RE: OLD MOLSIEVE! IT IS OK TO USE?
RE: OLD MOLSIEVE! IT IS OK TO USE?
RE: OLD MOLSIEVE! IT IS OK TO USE?
Samiran
RE: OLD MOLSIEVE! IT IS OK TO USE?
RE: OLD MOLSIEVE! IT IS OK TO USE?
from quark response i'm thinking of doing some lab test for my molsieve
By recording the dew point inlet and outlet and also the air flow, i can calculate the total moisture pickup/liter of adsorbent
Compare with the condition in real process i can determine whether the molsieve is still in good condition
how about that?
DevaxRayz
RE: OLD MOLSIEVE! IT IS OK TO USE?