| 摘要 |
<p>An improved method for the regeneration of catalytic cracking catalyst wherein a regeneration flue gas having a reduced concentration of carbon monoxide, preferably less than 0.05 vol. %, and a regenerated catalyst having a reduced residual carbon content, preferably less than 0.1 wt. %, are obtained by first burning coke from the coke-contaminated catalyst at an elevated temperature such that when the coke burned is substantially completely converted to carbon dioxide, the temperature of the fluidized bed in the regeneration zone may then be reduced to a desired operating level while maintaining substantially complete conversion of the carbon to carbon dioxide. This is accomplished by regulating the amount of coke deposited on the catalyst in the reaction zone and adjusting the catalyst circulation rate. Effluent gas from the regeneration zone may be discharged directly to the atmosphere with no discernible effect upon ambient air quality.</p> |
