CLASSIFIED CATALYST SYSTEM AND HYDROGENATING DEMETALIZING METHOD FROM HYDROCARBON SUPPLY RAW MATERIAL USING SAID CATALYST SYSTEM

摘要

We provide a graded catalyst system which is used for removing calcium and sodium from hydrocarbon feed having at least 1 ppm calcium and 1 ppm sodium. It comprises two catalyst zones characterized as having decreasing porosity, increasing activity, and increasing surface to volume ratio in the direction of feed flow through the system. We also disclose a process for using it and a method for selecting catalyst for use therein.