Method for the injection of catalyst in a fluid catalytic cracking process, especially for heavy feedstocks
US4832825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1986 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Feb 7, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J8/0015
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a method and apparatus for injecting and conditioning regenerated catalyst particles at the base of a catalytic cracking reactor/elevator below the zone where the feedstock to be cracked is injected to give better uniformity of treatment and control of the effective C/O ratio. A first fluid is injected at a low rate into the reactor below the level where the catalyst particles coming from the regenerator are introduced so as to form a dense phase fluidized bed, and a second fluid is injected at a higher rate substantially above the zone where the catalyst particles coming from the regenerator enter so as to form a homogenized dilute phase fluidized bed of catalyst prior to subsequent contact with the feedstock to be treated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.