Patent ID: 7638101

Claim:
An apparatus system for effecting the fixed bed regeneration of catalyst particles used in the conversion of hydrocarbons, which comprises in combination: (a) a reaction zone comprising at least one vessel for contacting a fresh catalyst with a hydrocarbon stream and a recycle hydrogen gas stream to form a coked catalyst; (b) a plurality of individual means to the reactor zone for adding and withdrawing catalyst, hydrocarbons, and recycle hydrogen gas respectively to and from the reactor zone; (c) a regeneration zone comprising at least one vessel for combusting the coked catalyst with a recycle oxygen gas stream to form the fresh catalyst; (d) a plurality of individual means to the regeneration zone for adding and withdrawing catalyst and recycle oxygen gas respectively to and from the regeneration zone; (e) a heating means for raising the temperature of the recycle oxygen gas at an inlet to the regeneration zone sufficiently to begin combusting coke from the catalyst; (f) a device for measuring a lag time for an outlet temperature to respond to and ultimately reach about the same value as an inlet temperature to the regeneration zone; and (g) a controller device for ramping the inlet temperature with the heating means of step (e) using the measured lag time of step (f) in conjunction with a measurement of a change in the outlet temperature to complete combusting coke from the catalyst, said controller device optionally capable of detecting an outlet oxygen concentration.