CATALYST AND METHOD OF OLEFIN SYNTHESIS FROM DIMETHYL ETHER IN ITS PRESENCE Russian patent published in 2014 - IPC B01J29/40 B01J21/10 B01J21/06 B01J23/10 B01J21/04 C07C1/20 C07C11/02 

FIELD: chemistry.

SUBSTANCE: catalyst of synthesis of lower olefins from dimethyl ether based on zeolite of pentasil type with molar ratio SiO₂/Al₂O₃=37, which contains not more than 0.04 wt % of sodium oxide, and also contains zirconium oxide and/or lanthanum oxide, binding agent aluminium oxide, and additionally magnesium oxide with the following component ratio, wt %: aluminium oxide - 32.0-34.0, zirconium oxide and/or lanthanum oxide - 0.1-0.5, magnesium oxide - 0.1-2.0, zeolite - the remaining part. Synthesis of lower olefins from raw material mixture, which contains dimethyl ether and inert gas and/or water vapour, is carried out at temperature 320-450°C, atmospheric pressure and mass rate of raw material supply 500-45000 h^-1 in presence of said catalyst, non-processed or preliminarily processed with water vapour at temperature 500-750°C.

EFFECT: increased catalyst stability in conditions of water vapour impact, preservation of high degree of conversion and high selectivity to olefins for a long period of time.

3 cl, 3 tbl, 12 ex