Patent ID: 9283533
Filing Date: 2016-03-15
CPC Classification: B01J,C10G

Claim Text:
1. A method of regenerating a catalyst comprising the steps of: combusting coke from the catalyst in a second stage regenerator to produce a second flue gas, wherein the second stage regenerator comprises a second combustion chamber and a top with a top cross-sectional area; partially combusting the coke from the catalyst in a first stage regenerator, wherein the first stage regenerator comprises a first combustion chamber with a first combustion chamber cross-sectional area greater than the top cross-sectional area, wherein the first stage regenerator is positioned above the second stage regenerator, and wherein the top separates the first combustion chamber and the second combustion chamber such that the first combustion chamber comprises a cylindrical section directly over the top and an annular section surrounding the cylindrical section; venting the second flue gas into the first stage regenerator through a vent tube, wherein the vent tube comprises a discharge point; and dispersing a portion of the second flue gas into the annular section of the first combustion chamber by positioning the discharge point within the annular section, by venting the second flue gas from a side spout of the vent tube, or a combination thereof.