METHOD FOR DEHYDROGENATION OF FLUIDIZED MATERIAL LAYER FOR PRODUCTION OF LIGHT OLEFINS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC C07C5/333 C07C11/02 C07C11/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for the production of light olefins by means of dehydrogenation of alkanes in a group of reactors with a fluidized layer, operating in a semi-continuous mode (A_i; i=1, 2, …, n), where n is a number of reactors, using a common catalyst regenerator (D). Each cycle of the method includes following sequential stages: supply of a hot regenerated catalyst and a preheated diluent flow to reactors with a fluidized layer (A_i); preliminary processing of the regenerated catalyst by means of supply of reducing gas to reactors with a fluidized layer; supply of preheated alkane raw materials to reactors with a fluidized layer for catalytic dehydrogenation in the presence of the preliminary processed catalyst and for obtainment of a mixture of products, consisting of olefins, unreacted alkanes, and other gases; separation of the mixture of products from the catalyst in reactor centrifuges; separation of remaining hydrocarbon molecules from the spent catalyst by evaporation using vapor, nitrogen, or any other inert gas, and reduction of a gaseous evaporation product in reactor centrifuges; transmission of the spent catalyst to the regenerator (D), and reactivation of the spent catalyst in the regenerator by combustion of carbon deposited on the spent catalyst, using air, oxygen, or oxygen-containing gas. At the same time, a technological cycle in each reactor (A_i) begins at different time, so that a catalyst stock in the regenerator remains almost constant over time. The invention also relates to a device.

EFFECT: proposed invention allows for the production of light olefins from alkanes, using a reactor, which operates in a semi-continuous mode, and a regenerator operating continuously, without the use of intermediate heaters or large-sized reactors.

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