A riser includes a housing in communication with a entry conduit and an exit conduit. The housing is defined by a holdup chamber having a volume of between 1133 liters and 45307 liters. The riser is designed to receive a hydrocarbon feed and a catalyst. An apparatus for fluid catalytic cracking includes a riser in fluid communication with a reactor vessel. A hydrocarbon feed stream and a catalyst travel through a first section of the riser at a first velocity of between 1.5 m/sec to 10 m/sec and through a second section of the riser at a second velocity of more than 15 m/sec. A process for fluid catalytic cracking uses a riser with a holdup chamber. A hydrocarbon feed and a catalyst decrease in velocity in the holdup chamber to between 1.5 m/sec and 10 m/sec.
展开▼
机译：立管包括与入口导管和出口导管连通的壳体。所述壳体由容积在1133升至45307升之间的容纳室限定。提升管设计用于接收烃类进料和催化剂。用于流体催化裂化的设备包括与反应器容器流体连通的提升管。碳氢化合物进料流和催化剂以介于1.5 m / sec至10 m / sec之间的第一速度通过提升管的第一部分，并以大于15 m / sec的第二速度穿过提升管的第二部分。用于流化催化裂化的方法使用具有保持室的立管。烃进料和催化剂在滞留室内的速度降低到1.5 m / sec至10 m / sec之间。
展开▼
