Patent ID: 6884400

Claim:
A reaction and regeneration system to effect radial flow contact of a reactant stream with catalyst particles movable as an annular-form bed through the system by gravity flow and to reduce stresses in the bed, the system which comprises: a) a reactor having a catalyst retaining section, the catalyst retaining section being annular-form, the catalyst retaining section having an upper portion and a lower portion disposed below the upper portion; b) a first catalyst inlet port in communication with the upper portion of the catalyst retaining section; c) a first catalyst outlet port in communication with the lower portion of the catalyst retaining section; d) a regeneration section to at least partially rejuvenate catalyst particles, the regeneration section being in communication with the first catalyst outlet port to receive catalyst particles from the catalyst retaining section and in communication with the first catalyst inlet port to introduce catalyst particles to the catalyst retaining section; e) a second catalyst outlet port in communication with the lower portion of the catalyst retaining section; f) a second catalyst inlet port in communication with the upper portion of the catalyst retaining section; and g) a means for transferring catalyst from the second catalyst outlet port to the second catalyst inlet port, the means not being for introducing catalyst particles to the regeneration section, the means being in communication with the second catalyst outlet port and the second catalyst inlet port.