China Petroleum Chemical Corporation

Other

Research Institute of Petroleum Processing, Sinopec

Research Institute of Petroleum

Weimin Lu

Xieqing Wang

Xiaoxiang Zhong

Songnian Li

Jun Long

Zheng Li

Jiushun Zhang

Nan Jiang

Zhigang Zhang

Youhao Xu

Chaogang Xie

Yan Cui

Shouye Cui

Yongcan Gao

Jianguo Ma

Yinan Yang

The present invention discloses catalytic cracking apparatus and process, which are useful for catalytic cracking of heavy oils with a high heavy oil conversion, a high propylene yield and low dry gas and coke yields.

Catalytic cracking apparatus and process

The object of the present invention is to provide a catalyst regeneration process which can improve catalyst selectivity. A first aspect of the invention is characterized in that a spent catalyst from a reactor is introduced into a first fluidized bed regenerator and contacted with an oxygen-containing gas stream and optional steam to carry out a coke combustion reaction, wherein the resultant mixture of the partially regenerated catalyst and flue gas is introduced into a second fluidized bed regenerator and contacted with steam and an optional oxygen-containing gas stream to carry out a further regeneration reaction, and then the regenerated catalyst is introduced into the reactor. A second aspect of the invention is characterized in that a spent catalyst from a reactor is introduced into a fluidized dense bed regenerator and contacted with an oxygen-containing gas stream and steam to carry out a coke combustion reaction, and then the regenerated catalyst is introduced into the reactor. The inventive processes result in a more uniform distribution of the regenerated catalyst activity; due to the exposure of the catalyst to a low temperature for a long time, a part of the heavy metals are buried by the matrix and the remaining are passivated. Thereby dry gas and coke yields decrease sharply when hydrocarbons are subjected to a catalytic cracking reaction on the regenerated catalyst.

Catalyst regeneration process for improving catalyst selectivity

A stripper and a stripping process for removing the flue gas carried by regenerated catalyst. A cylindrical stripper mainly comprises a degassing pipe at the longitudinal axis, a horizontal pipe connected with the lower end of the degassing pipe, several sets of inner annular baffles and outer annular baffles arranged in alternative arrangement along the vertical direction. Inner annular baffles are fixed on the degassing pipe, outer annular baffles are fixed on the inner wall of the cylinder. The degassing pipe has holes below each set of the inner annular baffles. The regenerated catalyst enters the stripper from the upper part, comes into a countercurrent and crosscurrent contact with steam from the annular steam conduit, and the stripped regenerated catalyst leaves the stripper from the bottom. The removed flue gas and the excessive steam enter the degassing pipe through the opening part of the degassing pipe under each set of inner annular baffles and leave the stripper from the top under the action of steam or air from the horizontal pipe. Using this stripper can minimize the amount of the flue gas carried by regenerated catalyst.

Stripper and a stripping process for removing the flue gas carried by regenerated catalyst

Growing community of inventors

Beijing, China

Weimin Lu