INTEGRATED METHOD FOR DEHYDROGENATION OF C3-C4 HYDROCARBONS Russian patent published in 2021 - IPC C07C11/06 C07C5/333 C07C11/08 B01J23/96 B01J38/02 B01J38/12 

FIELD: chemistry.

SUBSTANCE: invention relates to an integrated method for obtaining C3-C4 olefins or C4 diolefins, including the following stages: (1)(a) bringing into contact with the fluidised bed in the dehydrogenation reactor (i) raw C3-C4 hydrocarbons and (ii) a catalyst flow containing a catalyst; in conditions ensuring formation of a mixture of products of the stage (1)(a) containing the target C3-C4 olefin or target S4-diolefin, hydrogen and unreacted raw C3-C4 hydrocarbons; and depositing coke on said catalyst and at least partially deactivating said catalyst so as to form an at least partially deactivated catalyst; and (b) transferring the mixture of products of the stage (1)(a) and said at least partially deactivated catalyst from said dehydrogenation reactor with a fluidised bed to a cyclonic separation system, and in conditions ensuring conversion of said mixture of products of the stage (1)(a) resulting in a mixture of products of the stage (1)(b); then the mixture of products of the stage (1)(b) and said at least partially deactivated catalyst are essentially separated from each other; (C) transferring at least part of said at least partially deactivated catalyst into the container of the regenerator and heating said at least partially deactivated catalyst therein to a combustion temperature of approximately 660°C to approximately 850°C, burning the coke deposited on said at least partially deactivated catalyst, wherein a heated additionally deactivated catalyst is formed during said heating, exhibiting lower activity for dehydrogenation of C3-C4 hydrocarbons than said at least partially deactivated catalyst, and (d) conditioning said heated additionally deactivated catalyst, including sustaining said heated additionally deactivated catalyst at a temperature of at least 660°C in a flow of oxygen-containing gas for more than 2 minutes resulting in an oxygen-containing at least partially reactivated catalyst exhibiting greater activity for dehydrogenation of C3-C4 hydrocarbons than said at least partially deactivated catalyst; and (e) transferring said at least partially reactivated catalyst back to said dehydrogenation reactor with a fluidised bed.

EFFECT: described integrated method provides an increase in the productivity of the equipment and a reduction in the environmental impact compared to other known and traditional methods.

15 cl, 3 dwg