METHOD OF PRODUCING ETHYLENE Russian patent published in 2012 - IPC C07C1/20 C07C1/24 C07C11/04 B01J23/30 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing ethylene through vapour-phase chemical decomposition of material containing ethanol, water and ethoxyethane in a reactor at high temperature and pressure in the presence of a catalyst layer containing supported heteropolytungstic acid. The method is characterised by that the reactor is adjusted and operates in conditions corresponding to the following parameters: 0.05<(P_water/(P_ethanol+P_ethoxyethane))/(8×10^-5HBSG+0.75) (1) and - 20<T_reaction-T_{dew point}, - 40×P_total._material+40×P_inert.<+80 (2). P_water, P_ethanol and P_ethoxyethane denote partial pressure of water, ethanol and ethoxyethane, respectively, with thermodynamic equilibrium composition of the material at operating temperature and pressure of the process in MPa. HBSG is hourly bulk speed of the gaseous material passing over the catalyst in h^-1. T_reaction is reaction temperature in °C, T_{dew point} is dew point of the material at its thermodynamic equilibrium composition in °C. P_total._material is total pressure of material in MPa, and P_inert. is partial pressure of inert substances in the composition of the material in MPa.

EFFECT: use of the present method enables to maintain moisture of the catalyst at an optimum level.

13 cl, 137 ex, 1 dwg