关键词: 催化裂化, 汽油, 辛烷值, 催化柴油, 回炼

Abstract: To meet the increasing market demand of gasoline in China, it is important to enhance FCC gasoline yield since it occupies over 70% of the gasoline pool. Technical measures for enhancing FCC gasoline yield are discussed and proposed as follows: (1) improve the cracking performance of FCC feedstock via refining process optimization and feed pretreatment; (2) select catalyst having high heavy oil crackability and keep the equilibrium catalyst with relatively high activity; (3) optimize the process conditions of reactor and regenerator to enhance the catalytic cracking reactions and increase once through conversion; (4) re-cycle FCC light circle oil (LCO), especially LCO rich in hydrocarbons having long side chain and single ring aromatic compounds to increase high octane gasoline yield; (5) control the operation conditions of fractionator and absorbing-stabilizing system to maximize the use of gasoline endpoint and RVP.

Key words: fluid catalytic cracking, gasoline, octane numbe, light cycle oil, re-cycle