Q & A > Question Details
Is there any quick method for theoretical estimation of hydrogen production from UOP R-56 platforming unit?
We are facing the problem of high LPG production (Higher cracking rate & lower delta T in the last reactor) after the second cycle. We tried to adjust Chloride and condensate injection rate but couldn't get the desired output. Does the regeneration effectiveness cause these changes?
One more thing, during the reduction in the regeneration, water produces through hydrogen reaction with the oxidized catalyst. My question is how do we know when to stop reduction?

@Ralph Ragsdale
We regenerate our unit 10 months back. and from the beginning, we are facing high LPG production problem. I believe our system is wet but don't know why. might be the improper regeneration. water production during regeneration is what I worried about. I think we didn't drain water up to the required limit. Only because we couldn't find any limits in the first place in Manuals.
1) The reaction inlet temperature of the third reactor can be reduced to regulate the increased amount of cracking. That will suppress the increased amount of LPG production and will yield higher purity H2.
2) If it is suspected that the system is wet, then an analysis of the recycle gas can reveal the true state of the system.
3) During regeneration, it is a practice to hold temperature until and unless water generated as as result of reduction stops accumulating in the separator vessel.
08/01/2018 A: Patrick Bullen, UOP, patrick.bullen@uop.com
Please contact your local UOP Regional Service Representative or
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08/01/2018 A: Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
Addressing your first question: If your feedstock analysis is the same as your previous cycle, look at the hydrogen production at the beginning of that cycle. If you are sure you now have the correct chloride and water balance, you may need to regenerate again.
08/01/2018 A: Krishna Rao Pulugurti, Retired/Consultant, pkrao2012@yahoo.com
You can calculate the hydrogen generated from the DHA analysis of Feed, Reformate and Stabilizer off gas composition. The thumb rule is,
Input = Output
Hydrogen input = Hydrogen output
Hydrogen input = Hydrogen in the feed
Hydrogen output = Hydrogen in reformate + Hydrogen in Stabiliser off gas + Free hydrogen
Free hydrogen is hydrogen generated
You can make an MS Excel programme so that you will not need to calculate every time.