METHOD FOR OBTAINING OLEFIN HYDROCARBONS Russian patent published in 2018 - IPC C07C5/333 C07C11/08 C07C11/10 B01J21/08 B01J23/04 B01J23/26 B01J35/02 B01J37/02 

FIELD: technological processes.

SUBSTANCE: method for producing olefinic hydrocarbons by dehydrogenating the corresponding paraffinic hydrocarbons, carried out in a fluidized bed of a finely dispersed oxide alumina chromium catalyst circulating in a reactor-regenerator system, including coke combustion and oxidation of the catalyst with air oxygen in a regenerator, reduction of the oxidized catalyst with hydrogen-methane-containing gas, desorption of the reduction products and reaction with an inert gas, feeding with fresh catalyst. Process is carried out with the withdrawal of part of the circulating catalyst from the system in an amount of 0.07–0.8 wt. % of the supply of raw materials to the reactor for the production of olefinic hydrocarbons and subsequent feeding it with a catalyst, obtained by the method of molding from the sol and containing 0.5–3.5 wt. % hexavalent chromium, in an amount that ensures a constant amount of catalyst in the system, and further, a catalyst prepared by a method of impregnating a carrier and containing 1.2–4.0 wt. %. hexavalent chromium in an amount providing hexavalent chromium content in the oxidized catalyst in the range of 0.25–1.5 wt. %.

EFFECT: improvement of technical and economic indicators of processes for the production of olefinic hydrocarbons by reducing catalyst consumption and increasing yields of olefinic hydrocarbons.

11 cl, 1 dwg, 2 tbl, 2 ex