PROCESS FOR FLUID CATALYTIC CRACKING OF HEAVY FRACTION OILS

摘要

The present invention relates to a catalytic cracking process for heavy oils, and more particularly, to a fluid catalytic cracking (FCC) method for obtaining light olefins such as ethylene, propylene, butene, and pentene from heavy oils in high yield. The purpose of the present invention is to suppress hydrogen transfer reaction and overdegradation after the reaction and to obtain light olefins in high yield. In the constitution, heavy oil is supplied to the raw material introduction portion installed at the reaction zone inlet by using a fluid catalytic cracking device. Further, the heavy oil and the catalyst are brought into contact with each other by supplying a part of the regeneration catalyst taken out from the catalyst regeneration zone to the catalyst introduction section searched in the reaction zone, and another part of the regeneration catalyst taken out from the catalyst regeneration zone And at least one catalyst introduction section provided between the catalyst introduction section installed at the reaction zone inlet and the reaction zone outlet. The heavy oil and the catalyst were brought into contact with each other, and the catalytic cracking in the reaction zone was carried out under the condition that the contact time was 0.1 to 3.0 seconds, the reaction zone outlet temperature was 530 to 700 ° C, and the catalyst / oil ratio was 10 to 50 wt% / wt. Therefore, the light olefin is produced.