At present we face sudden increase in bromine index for benzen product in our aromatic plant. This cause our benzene product to goes to off spec as the BI exceeded the spec limit. We did several actions in order to improve the Bi level, hot clay treater for BT cut , one was isolated for replacement and only one remaining now in service and operated at higher temperatures, so is there any one has such experience. Please advise
Also the Bz losses in raffinate product from extractive column was increased to allow more lifting of heavy olefin, but still the observed effect is very minor ,so please share with us your experience if any for such case.