METHOD OF OBTAINING LIGHT OLEFINS FROM METHYLCHLORIDE Russian patent published in 2008 - IPC C07C11/02 C07C11/04 C07C1/30 B01J21/08 

FIELD: chemistry.

SUBSTANCE: invention concerns a method of obtaining low olefins from methylchloride involving passing of source gas reaction mix containing at least methylchloride over at least one catalyst layer with active centres characterised by the presence of absorption band with wave numbers within ν=1410-1440 cm^-1 in the infrared spectres of adsorbed ammonium, the catalyst containing active component and high-silica carrier characterised by the presence of Si bands with chemical shifts of -100^±3 ppm (band Q³) and -110^±3 ppm (band Q⁴) in the NMR²⁹ spectres with integrated intensity ratio of Q³/Q⁴ bands within 0.7 to 1.2, and by hydroxyl groups absorption bands with wave number ν=3620-3650 cm^-1 and half-width 65-75 cm^-1 in the infrared spectre, and specific surface area measured by BET method by argon heat desorption S_Ar=0.5-30 m²/g, surface area measured by alkali titration method S_Na=10-250 m²/g at the S_Na/S_Ar ratio of 5-30. The method also involves formation of active centres with higher acidity in the catalyst characterised by deuterium-hydrogen exchange depth of not less than 10% at 350-355°C in a deuterium and hydrogen mix containing 0.6% of hydrogen, 0.6% of deuterium, 0.05% of Ar and 98.75% of nitrogen, at volume feed rate of the said deuterium-hydrogen mix of 20000 h^-1 in thermoprogrammed reaction mode at heating rate of 10 K/min and/or by additional introduction of either copper, or zinc, or silver to the active component content.

EFFECT: high selectivity of methylchloride transformation to light olefins together with high ethylene yield and improved deactivation resistance of catalyst.

3 cl, 8 ex