Continuous catalyst regeneration in a fluidized bed reactor

A chemical reaction process comprising concomitantly:

• feeding by a reaction stream of a fluidized bed of catalyst particles into a reaction zone disposed in a chamber of a reactor,
• withdrawing a stream comprising reaction products at an outlet of the reaction zone,
• passing, using separating means, the catalyst particles of the fluidized bed from the reaction zone to a regeneration zone disposed inside the chamber of the reactor,
• feeding the regeneration zone by a regeneration stream,
• regenerating the catalyst particles and pneumatically entraining the catalyst particles into the regeneration zone,
• withdrawing an exhaust gas at the outlet of the regeneration zone, and
• returning the entrained catalyst particles to the reaction zone;
• wherein the deactivation time of the catalyst is from 1 to 20 times greater than regeneration time, the deactivation time being a time when the catalyst particles lose 25% of their initial efficiency and the regeneration time being a time from the deactivation time until the catalyst particles regain up to about 100% of said initial efficiency;
• wherein the separation means comprises a tubular wall and wherein the reaction zone is disposed outside the tubular wall and the regeneration zone is disposed inside the tubular wall.