The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1993
Filed:
Apr. 24, 1992
Applicant:
Inventors:
David A Van Kleeck, Sugarland, TX (US);
Donald E Hardesty, Sedona, AZ (US);
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ; F27B / ;
U.S. Cl.
CPC ...
422142 ; 422140 ; 422141 ; 422144 ;
Abstract
A process and apparatus for rapid stripping of fluid cracking catalyst is disclosed. A series of concentric annular beds provide rapid initial removal of hydrocarbons from the interstices of the catalyst particles. Successive stages of stripping allow time for hydrocarbon diffusion from catalyst's pores while maintaining low hydrocarbon partial pressure. Residence times increase as the catalyst passes to the different catalyst beds.