METHOD FOR PREPARING OLEFINS Russian patent published in 2003 - IPC

FIELD: chemical technology. SUBSTANCE: invention relates to method for preparing olefins from hydrocarbons. Method involves the following steps: (a) formation of the first raw flow comprising gaseous fuel and oxygen-containing gas; (b) contacting the first raw flow with the first catalyst under conditions providing preparing the product flow and unreacted oxygen; (c) formation of the second raw flow comprising the parent hydrocarbon raw, and (d) contacting the second raw flow, product flow from the step (b) and unreacted oxygen from the step (b) with the second catalyst that catalyzes oxidation being at least part of unreacted oxygen is consumed and olefin product forms. Method provides the enhanced yield of olefins and increase of selectivity with regards to olefin product and enhanced output of reactor. EFFECT: improved preparing method. 17 cl, 4 tbl