Q & A > Question Details
What is the process for detecting leak in feed/effluent heat exchanger of C5/C6 isonerization process which uses zeolite catalyst, without shutdown or using radio active tracers? Is there any component which when injected along with feed will completely react in isomerization reactor?
11/08/2017 A: NS Murthy, GE, murthy.ns@ge.com
Perhaps checking the level of Benzene in product will help to identify extent of leak from feed to product in the feed vs effluent exchanger as I see in most ISOM units, Bz gets fully saturated too. Other option could be check the mol. ratio of nC5/nC6 in feed vs product. It could throw some light on leak across the exchanger. Good luck.
10/08/2017 A: Patrick Bullen, UOP, patrick.bullen@uop.com
The benzene that is in the feed is a good check for exchanger leaks if the catalyst is in good condition and has demonstrated in the past nearly complete saturation to cyclohexane. With active zeolitic catalyst having 1-5 wt% benzene in the feed, the catalyst will reduced the benzene to trace levels to 0.01-0.05 wt% in the product. If you can confirm from previous data that you have good benzene saturation, then benzene in the product can be used as a tracer to determine how much the exchanger is leaking.
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10/08/2017 A: Eric Hennings, Technip Stone & Webster, Eric.Hennings@technipFMC.com
I have injected a small amount of dye into the feed side, whilst taking continuous visual samples on effluent. A temporary cooler and separator is required.