The Flexible Dual Function Catalytic Cracking ( FDFCC ) process with two riser reactors developed by Luoyang Petrochemical Engineering Corporation ( LPEC ) is characterized by its multifunctions, including catalytic cracking, gasoline upgrading as well as enhancement of olefins productivity together by its flexibility in operation. 洛阳石化工程公司开发的灵活双效催化裂化(简称FDFCC)工艺,设有两根提升管反应器,它兼有催化裂化和汽油改质、增产烯烃的功能,操作灵活。