METHOD FOR OBTAINING LIGHT OLEFINS USING OXYGEN-CONTAINING COMPOUNDS AND DEVICE FOR ITS APPLICATION Russian patent published in 2017 - IPC C07C1/20 C07C11/02 C07C11/04 C07C11/06 

FIELD: chemistry.

SUBSTANCE: method includes the following steps: step a), in which the starting material containing the oxygen-containing compound is introduced in parallel from n feed branched lines to the first-n-th secondary reaction zones in the fluid bed reactor produced in the dense phase and comes into contact with the catalyst to generate a stream comprising a product of light olefins and a spent catalyst, wherein the said catalyst sequentially passes through the 1-st-n-th secondary reaction zones, the carbon content of the post foam increases, and wherein in the said fluidized bed created in the dense phase, n-1 of the devices to control material flow and one bump are arranged vertically, forming n secondary regeneration zone; step b), in which the stream containing the product of light olefins flowing from the 1-st-n-th secondary reaction zones is separated from the spent catalyst that it carries; the said stream containing the product of light olefins passes into the product separation section and, after separation and purification, a product of light olefins is obtained; the separated spent catalyst passes into the n-th secondary reaction zone; and step c), in which the spent catalyst flowing from the n-th secondary reaction zone, after separation and lifting, passes to the fluidized bed regenerator in the dense phase for regeneration; the said spent catalyst sequentially passes through the 1-st - m-th secondary regeneration zones; the regenerating medium is introduced in parallel from m feed branched lines of the regeneration zone into the 1-st - m-th secondary regeneration zone; the spent catalyst comes into contact with a regenerating medium. The carbon content in it gradually decreases; after completion of the regeneration, the catalyst is returned back to the 1-st secondary reaction zone by separation and lifting; where in the fluidized bed regenerator in the dense phase, m-1 of the material flow monitoring devices and one baffle are vertically arranged forming m secondary regeneration zones; where 8≥n≥2 and 8≥m≥2, and where the material flow monitoring device consists of a separation plate, a hole, a downflow pipe, a lower bump, and a heat exchanger element; the catalyst passes into a downflow pipe from the top of the downcomer where the apparent linear velocity of the gas is less than or equal to the minimum fluidization velocity, wherein the catalyst in the downcomer tube is in a stuffed dense phase state and the driving force of the material flow is formed for flowing the catalyst through an opening to the next secondary reaction zone, or to the next secondary regeneration zone.

EFFECT: use of the proposed method makes it possible to increase the selectivity to olefins obtained.

10 cl, 3 ex, 5 dwg