Abstract: By using polycyclic naphthenes as raw materials and controlling reaction pathways precisely, a new fine FCC process (FFCC) was developed, which characterized by simplifying feedstock composition, finely controlling the reaction process and customizing target products. By the new process, the production of iso-butane, iso-pentane, and xylene were maximized. The tests of catalytic cracking reactions of feedstocks with different content of polycyclic naphthenes showed that when the content of polycyclic naphthenes in the feedstock exceeds 55%, the yields of iso-butane, iso-pentane, and xylene are 8.37%, 9.87%, and 6.97%, respectively. The higher the depth of catalytic distillate hydrogenation in single-pass, the higher the yields of target products and the hydrogen utilization efficiency, and the lower the hydrogen consumption and energy consumption.

Key words: polycyclic naphthenes, FCC, iso-butane, iso-pentane, xylene