Patent ID: 7101516

Claim:
A regenerator vessel comprising an upper end and a lower end wherein: the lower end comprises: a means to supply catalyst particles which is fluidly connected to a fluidized bed zone of catalyst comprising a vertically extending partition, provided with one or more openings, dividing the fluidized bed zone into a dense phase fluidized bed zone and a fast-fluidized bed zone, the dense phase fluidized bed zone provided with the means to supply catalyst and the fast-fluidized bed zone provided with the means to supply an oxygenate gas at its lower end; and, the upper end comprises: means to discharge regenerated catalyst; means to discharge combustion gases from the vessel; and, means to separate entrained catalyst from the combustion gases, wherein the vertical partition has a tubular design resulting in an annular outer fluidized bed zone and a circular inner fluidized bed zone, wherein the inner fluidized bed zone is the dense phase fluidized bed zone and the annular outer fluidized bed zone is the fast-fluidized bed zone, and wherein the vertical partition is closed at its upper end such that the dense fluidized bed zone is not in open communication with the upper end of the regenerator vessel and wherein the openings in the partition are positioned at an elevated position in the vertical partition.