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:
Aug. 27, 1991
Filed:
Nov. 27, 1987
Arthur A Lietz, Oakhurst, NJ (US);
Arthur Yanowitz, Cranford, NJ (US);
Patrick H Terry, Middletown, NJ (US);
Michael Bober, Jr, Toms River, NJ (US);
William L Wickman, Dayton, NJ (US);
Exxon Research & Engineering Company, Florham Park, NJ (US);
Abstract
The present invention contemplates an improved grid for fluid bed reactors which minimizes catalyst coking in fluidized catalytic cracking operations by shedding catalyst dispersed through the grid from feed risers located therebelow. Indeed, the grid has a central portion containing a plurality of orifices therein and a downwardly extending annular ring portion for shedding catalyst outwardly and downwardly for collection and removal from the reactor vessel. In the preferred embodiment of the present invention, the grid consists of a convex upper grid and a concave lower plate joined together and defining a disengaging zone therebetween. At least one riser opens into the disengaging zone for introducing the material to be fed into and separated in the reactor. The upper grid includes a solid annular ring which extends outwardly and downwardly from the point at which the upper grid and the lower plate are joined.