Catalytic cracking device and method

Abstract

The present disclosure relates to the field of catalysis. Provided are a catalytic cracking device and method. The device comprises a multi-stage reaction unit (1) and a cracking reaction unit (2), wherein the multi-stage reaction unit comprises a variable-diameter riser pipe (11) and a multi-stage reaction settler (12), and the cracking reaction unit (2) comprises a cracking riser pipe (21) and a cracking settler (23); the variable-diameter riser pipe (11) comprises a first reaction zone (11a), a second reaction zone (11b) and a third reaction zone (11c); the inner diameter of the second reaction zone (11b) is larger than the inner diameter of the first reaction zone (11a) and the inner diameter of the third reaction zone (11c), and an inner conveying pipe (13) extending into the second reaction zone (11b) is provided at the connection between the third reaction zone (11c) and the second reaction zone (11b); and a cracking catalyst outlet (25) in communication with the second reaction zone (11b) is provided in a cracking stripping section (23a) of the cracking settler (23). The device can improve the reaction efficiency of catalytic cracking of heavy oil and light hydrocarbons, and achieve a tight coupling between the heavy oil and the light hydrocarbons.

Dependencies are inferred from the claim text.