Minimal holdup reactor grid
US5043145A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1987 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | Nov 27, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J8/1872
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.