Catalytic cracking process comprising recracking of cat naphtha to increase light olefins yields

摘要

The described invention comprises a process for increasing the yield of C₃ and C₄ olefins by injecting light cat naphtha (22) together with steam (24) into an upstream reaction zone (30) of a FCC riser reactor (32). The products of the upstream reaction zone (34) are conducted to a downstream reaction zone (36) and combined with fresh feed (30) in the downstream reaction zone.