Abstract: The DCC unit in SINOPEC Anqing Company is lack of NOx reduction equipment. To meet the requirement of NOx emission regulations，a commercial trail of RDNOx additive was conducted. The results showed that, when additive was accumulated to about 2.5% of catalyst inventory and added by 0.03 kg/t (based on fresh feed) without strict controlling of excess O2, NOx in flue gas could be decreased to 70 mg/m3, which meets the requirements of the latest national regulations. Nowadays, the addition of RDNOx is adjusted to 0.015 kg/t (about 1.5% of fresh catalyst); NOx in flue gas is still lower than the limitation. Compared with the 400~500 mg/m3 NOx emissions before adding the additive, NOx is decreased by over 80%. In addition, the application of RDNOx additive has little influence on product distribution and properties.

Key words: FCC, flue gas, NOx, additive