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This is question is related to high potential gum in gasoline ex FCC. We have 2 gasoline merox reactors (A&B) and recently we have bypassed 1 reactor(A). Thereafter we observed some abnormal results of high potential gum (as high as 1300 ppm). On further analysis, we have checked merox inlet (B) and outlet(B) as well as combined outlet(A&B) i.e., Rundown. we have found high gum at inlet (1200 ppm) and immediate out let (500 ppm) and combined outlet (900). As per literature and my experience gasoline merox reactor doesn't contribute or treat potential gum but couldn't able to find the source. Also inlet is higher side, we have checked olefins at inlet (28% reported). what could be possible reasons for high gum at inlet and why are we observing gum abnormalities across reactor?
 
Answers
28/10/2018 A: Chirag Pethani, Reliance industries ltd, pethpethanichirag3113@gmail.com
Diolifines are precauser for gum formation in gasoline but in presence of oxygen.
Also check for free oxygen ingress.
26/07/2018 A: NS Murthy, Suez, murthy.ns.ext@suez.com
Couple of things you may look into.
1. Peroxide level or simply test for all types of oxygenates present in untreated FCC gasoline. Also, did you make any change in FCC catalyst having higher pore size distribution apart from operational severity.
2. Check the sour water quality from HP receiver of FCC GASCON section. Any noticeable change which can be linked to presence of other impurities in FCC gasoline.
12/07/2018 A: Sridhar Balakrishnan, Bharat Oman Refineries Limited , laksrid@yahoo.com
Gum content in FCC gasoline can he higher . This is due to olefins and particularly due to diolefin, which contribute to increase in gum content. Estimate the diolefin content in gasoline, by UOP method. Also conjugated diolefins and some heteroatoms can contribute increase in gum content of gasoline.