Process for the preparation of olefins

摘要

Process for the preparation of olefins comprising reacting an oxygenate and/or olefinic feed in a reactor in the presence of a molecular sieve catalyst to form a mixture which comprises olefins and at least partially coked catalyst;
passing at least partially coked catalyst to a regenerator; introducing into the regenerator an oxygen-containing gas to regenerate the at least partially coked catalyst, thereby producing a gaseous mixture and at least partially regenerated catalyst; separating at least partially regenerated catalyst and at least part of the gaseous mixture; analysing the composition of the gaseous mixture to control the burning rate of the coke present on the at least partially coked catalyst in the regenerator by adjusting the mass flow rate of the oxygen-containing gas on the basis of the analysis of the gaseous mixture; and passing at least part of the at least partially regenerated catalyst back to the reactor.

主权项

1. Process for the preparation of olefins, which process comprises the steps of:
(a) reacting an oxygenate and/or olefinic feed in a reactor in the presence of a molecular sieve catalyst to form a mixture which comprises olefins and at least partially coked catalyst; (b) separating olefins and at least partially coked catalyst as obtained in step (a); (c) recovering olefins obtained in step (b); (d) passing at least partially coked catalyst as obtained in step (b) to a regenerator; (e) introducing into the regenerator an oxygen-containing gas to regenerate at least part of the at least partially coked catalyst in a partial burn mode, thereby producing a gaseous mixture and at least partially regenerated catalyst; (f) separating at least partially regenerated catalyst and at least part of the gaseous mixture as obtained in step (e); (g) analysing the composition of the gaseous mixture as obtained in step (e) to control the burning rate of the coke present on the at least partially coked catalyst in the regenerator by adjusting the mass flow rate of the oxygen-containing gas as introduced in step (e) on the basis of the analysis of the gaseous mixture such that between 0.01-5 wt% of the coke present on the at least partially coked catalyst is removed from the catalyst during regeneration; and (h) passing at least part of the at least partially regenerated catalyst as obtained in step (f) to the reactor in step (a).