Fremgangsmåte for omdannelse av oksygenater til olefiner ved bruk av molekylsiktkatalysatorer omfattende ønskelige karbonholdige avsetninger

摘要

The present invention relates to methods for selectively converting oxygenates to light olefins, preferably ethylene and propylene, in which desirable carbonaceous deposits are maintained on a total reaction volume of catalyst by totally regenerating only a portion of the total reaction volume of catalyst and mixing the regenerated portion with the unregenerated total reaction volume of catalyst.