Patent ID: 8673249
Filing Date: 2014-03-18
Classification: B01D,B01J,C10G

Abstract:
1. A process for reducing the amount of nitrogen oxides (NO x ) discharged to atmosphere from a fluid catalytic cracking unit comprising a regenerator and a collecting means for collecting and supporting catalyst particles, wherein a flue gas containing NO x is discharged from the regenerator and is then passed to the collecting means, said process comprising: (a) adding a catalyst to the flue gas prior to entering the collecting means; (b) precipitating the catalyst in the collecting means to form a catalyst bed in the collecting means; (c) adding ammonia or an ammonia precursor to the flue gas prior to entering the collecting means, to the flue gas within the collecting means, or both; (d) reacting NO (e) discharging the flue gas containing a reduced amount of NO wherein the catalyst is one or more supported transition or lanthanide metal catalysts and the collecting means is an electrostatic recipitator or a combination of a fast fluidized bed and a cyclone.