We have recently commissioned a 0.74 MMTPA RFCCU with mainly reduced crude oil (85%) and coker gas oils (10-12 %) as feed. We are getting a very high benzene content (~ 2-3%) in our light cycle naphtha (LCN), leading to problems in the finished MS pool due to a benzene limit of 1%. The downstream naphtha hydrotreater unit is only able to desulfurize the LCN with no benzene saturation. What methods will control the formation of benzene in the reactor, by either a change in feed composition or the operating parameters?