Q & A > Question Details
1. How we predict/calculate theoretical life of sulfur guard bed if we know the weight and bulk density of catalyst? Purpose is to absorb sulfur (Organic/inorganic H2S) from light naptha before goind to isom section?
2. Can we use DIH (De-ioshexaniser column) bottom isomerated in Recycle feed in Isomerisation section for increasing the conversion of n-parafins into iso-parafiins? what will be the impact on isom catalyst life?

Additional info:
Here light naptha means C5-90 CUT coming from Naptha splitter (Ex-cdu unit)
 
Answers
11/06/2013 A: kamaljit medhi, indian oil corporation limited, digboi refinery, kamaljitmedhi1975@gmail.com
Regarding you query about DIH recycle, the DIH bottom part contains the naphthene which is difficult to isomerize. Also more of naphthene in feed is not desirable for the activity of Isomerization catalyst of Pt-alumina catalyst.
For calculating the life of S -guard, you need to know the S content in the feed and picl up value of the adsorbent which you can confirm from the adsorbent vendor.
25/02/2013 A: Balasubramanian Iyer, Nexen CNOOC Limited, balasubramanian.n@aol.in
For Calculating the Theoretical Life of Sulfur Guard bed you should know the Feed Sulfur Content, Catalyst Loading i.e Sulfur take up by the Sulfur Guard catalyst depends on the vendor. and ZnO Content. If you know this then you can calculate the Life of Sulfur Guard Catalyst bed by simple arithmetic.
29/01/2013 A: Egbert van Hoorn, Hocon B V, Egbertvh@hotmail.com
What do you mean with light naptha? Is this C3-C4 (LPG) or C5-C7?