FCC of nitrogen containing hydrocarbons and catalyst regeneration
US5268089A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1992 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Jun 24, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G11/185
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Oxides of nitrogen (NO.sub.x) emissions from an FCC regenerator are reduced by forcing the regenerator to operate between full and partial CO burn mode. Operating with less than 1 mole % O2 and up to 1 or 2% CO in the flue gas creates conditions which oxidize nitrogen compounds in coke on spent catalyst to NOx, and simultaneously convert NOx in the regenerator to nitrogen. A downstream CO boiler can burn this low CO flue gas without producing large amounts of NOx. Most NOx emissions can be eliminated. An apparatus, with the regenerator air:coke ratio controlled by both CO and O2 analyzers monitoring regenerator flue gas, is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.