Abstract: Coker distillates (mixed coker gasoline and diesel fractions) from crude oil with high acid, iron and calcium content were treated by RP-DF(1) agent to remove iron and calcium. Static and dynamic experiments were carried out and the effects of reaction conditions, such as temperature, the mass ratio of agent to iron, the types of water injected and the water injection rate, on the iron removal were investigated. It was found that under the conditions of using distilled water or fresh water with a water injection rate of 10%, a reaction temperature of 110℃ and the agent to iron mass ratio of 14, the iron content of the treated coker distillates could be less than 1.5 μg/g, besides, calcium in the distillates was removed as well. The other properties of the treated distillates remained unchanged and it could well meet the requirements of downstream hydroprocessing.

Key words: Coking, Naphtha and diesel oil, Iron and calcium removal