METHOD FOR PREPARING A LIGHT OLEFIN USING AN OXYGEN-CONTAINING COMPOUND

摘要

The present invention relates to a method for improving the light olefin yield in the process of preparation of a light olefin using an oxygen-containing compound. More specifically, the present invention provides a method for preparing a light olefin using an oxygen-containing compound, in which, a multi-stage dense phase fluidized bed comprising k secondary pre-carbon deposition zones (k‰¥1) and n secondary reaction zones (n‰¥1) is used as a reactor, and a multi-stage dense phase fluidized bed regenerator comprising m secondary regeneration zones (m‰¥2) is used as a main equipment. By the method of re-refining the hydrocarbons with four or more carbons obtained in the separation section, or adding naphtha, gasoline, condensate oil, light diesel oil, hydrogenation tail oil or kerosene in the reaction zone, the invention primarily solves the problems in the prior art of the uniformity of carbon deposition amount and the carbon content of the catalyst being difficult to control, and the light olefin yield being low.