DEVICE FOR CONTACTING HIGH CONTAMINATED FEEDSTOCKS WITH CATALYST IN AN FCC UNIT

摘要

An FCC process and apparatus comprising an enlarged riser section (22) and a distributor (12) in an elevated position and with an opening (86) in its tip (88) away from a riser wall (23) may reduce coke build-up along the interior walls of a riser (20). Catalytic mixing may be improved, which could reduce riser coking by increasing hydrocarbon contact with catalyst before contacting the riser wall. Increasing the distance between the introduction of the hydrocarbon and the riser wall may increase this likelihood for hydrocarbon-catalyst contact. Highly contaminated hydrocarbons cause greater coking than do normal hydrocarbons, and this FCC process and apparatus may be effective in decreasing riser coking on heavy hydrocarbons.