Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Process and apparatus for catalytic cracking of residual oils










Image Number 2 for United States Patent #4875994.

A process and apparatus for cracking heavy hydrocarbons using a mixture of fluid cracking catalyst and a demetallizing additive differing in physical characteristics from the cracking catalyst is described. A heavy, metals containing feed such as a resid contacts demetallizing additive in the base of a riser reactor. The demetallized resid is cracked by contact with a stream of hot, regenerated catalyst. A mixture of metal containing additive, deactivated cracking catalyst, and cracked products is discharged from the riser. The metal containing additive and deactivated catalyst are stripped, preferably with steam, and charged to a two-stage regenerator. The first stage of the regenerator partially regenerates the cracking catalyst and separates it by elutriation from the demetallizing additive, which accumulates as a dense phase fluidized bed in a lower portion of the first stage regenerator. Partially regenerated cracking catalyst is carried up out of the first stage regenerator and regeneration is completed in a second stage regenerator by contact with an oxygen containing gas. Demetallizing additive is withdrawn from the first stage of the regenerator and charged to the base of the riser. Hot regenerated cracking catalyst is withdrawn from the second stage regenerator and recycled to the riser. Preferably, heat removal means are provided in the first or second stage regenerator, the additive return line, or the regenerated catalyst return line to the riser. An additional stripping stage, preferably a hot stripper operating with CO as a stripping gas, may be provided intermediate the conventional stripping section and the regenerator.








 
 
  Recently Added Patents
Asynchronous task execution
Gas sensor with a porous layer that detectably affects a surface lattice resonant condition of a nanoparticle array
Vacuum cleaner filter adapter ring
Process for producing polyphenylene ether composition
Azole derivatives, methods for producing the same, intermediate thereof, agro-horticultural agents
Ventilated vacuum commutation structure
Methods and apparatus for imaging in conjunction with radiotherapy
  Randomly Featured Patents
Method of using a condensing lens
Magnetoresistive sensor having exchange-coupled stabilization for transverse bias layer
Container with gas release feature
Pneumatic tire
Sprinkler head assembly
Gona-4,9(10)-dienes and process of producing the same
Outsole for a golf shoe
Light display apparatus for a child's toy
Incremental anti-spam lookup and update service
Probe type shape measuring sensor, and NC processing equipment and shape measuring method using the sensor