CATALYTIC CRACKING PROCESS FOR HEAVY PETROLEUM FRACTIONS Russian patent published in 2005 - IPC

FIELD: petroleum processing.

SUBSTANCE: cracking of heavy petroleum fractions is carried out in presence of microspherical zeolite-containing catalyst feedstock is brought into contact with regenerated catalyst followed by separation of cracking product from coked catalyst and steaming of the latter in steaming zone to remove hydrocarbons. Coked catalyst is then passed from the pressure column of reactor into lower part of transportation line. Air is also supplied into this line through air-feed device having ratio of inlet to outlet diameter (2÷2.5):1. Further, coked catalyst is moved into regenerator to be subjected to oxidative regeneration. Regenerated catalyst from regenerator passes J-shaped bend at the base of lift reactor, while steam is uniformly introduced into the same J-shaped bend over connecting pipes. After that, regenerated catalyst is returned into reactor. In the J-shaped bend, optimal conditions are maintained to prepare return of regenerated catalyst into reactor, in particular velocity of steam flow from connecting pipes is maintained within a range of 20 to 80 m/s.

EFFECT: increased output and improved quality of desired cracking products, and increased reliability of equipment.

2 dwg, 1 tbl