Patent ID: 9233350
Filing Date: 2016-01-12
CPC Classification: B01J

Claim Text:
1. A method for starting-up a process for producing light olefins from methanol in a reaction-regeneration unit, comprising the following steps: preheating the reaction-regeneration unit having a reactor and a regenerator prior to introducing a methanol-containing feedstock into the reactor, wherein the preheating step comprises steps (a), (b), and (c): (a) heating the regenerator using hot air until a dense phase stage of the regenerator reaches a temperature in a range from about 350° C. to about 550° C., and heating the reactor using a superheated steam having a temperature of about 400° C. to about 550° C.; (b) charging a first portion of a catalyst into the regenerator and charging a second portion of the catalyst into the reactor; (c) closing a spent catalyst slide valve in a spent catalyst slope tube and a regenerated catalyst slide valve in a regenerated catalyst slope tube when the temperature of the reactor reaches at least about 350° C.; injecting a first back-flushing gas into the spent catalyst slope tube so that a density of the catalyst in the spent catalyst slope tube is less than about 100 kg/m injecting a second back-flushing gas into the regenerated catalyst slope tube so that a density of the catalyst in the regenerated catalyst slope tube is less than about 100 kg/m (d) introducing the methanol-containing feedstock into the reactor when a dense phase stage of the regenerator reaches a temperature of at least about 350° C.; establishing a circulation of the catalyst in the reactor; and forming carbon deposits on the catalyst; (e) establishing a circulation of the catalyst between the reactor and the regenerator when a temperature of the dense phase stage of the regenerator reaches at least about 400° C. and an average amount of carbon deposits on the catalyst in the reactor reaches at least about 2.5%; and (f) burning the carbon deposits on the catalyst in the regenerator to release heat so as to heat the regenerator to a temperature above about 580° C.