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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.
 
Answers
09/09/2018 A: senthil rajappan, SADARA, senthil.rajappan@sadara.com
Check unsaturated in your feed and run simulation to match your condition .
Bz loss in raffinate is due to higher temperatures which not correct form my opinion.
05/09/2018 A: Sridhar Balakrishnan, Bharat Oman Refineries Limited , laksrid@yahoo.com
May be due to presence of unsaturated hydrocarbon present along heavier aromatic hydrocarbon which can increase the Bromine index of the pure product.