COMBINATION OF INSTALLATION FOR CONVERTING METHANOL IN OLEFINS WITH INSTALLATION FOR PYROLYSIS OF HYDROCARBONS Russian patent published in 2014 - IPC C07C2/86 C07C4/06 C07C1/20 C07C11/04 C07C11/06 C10G9/36 C10G11/00 

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining light olefins. Method includes: (a) passing oxygenate raw material into reactor for converting oxygenates into olefins for oxygenate raw material to contact with molecular-sieve catalyst and to be converted in light olefins, which are discharged from reactor for conversion of oxygenates in olefins in form of outflow; (b) division of outflow into first flow of light olefins, separated from first flow, containing C4 and heavier hydrocarbons; (c) selective hydration and further cracking of first flow, containing C4 and heavier hydrocarbons, in second reactor of olefin cracking, with application of catalyst of olefin cracking, with formation of first outflow of cracking gases, containing light olefins; (d) separate cracking of hydrocarbon flow with formation of second outflow of cracking gases, containing light olefins, and separate flow of pyrolysis gas, containing C4 and heavier hydrocarbons; (e) co-fractionation of first and second outflows of cracking gases to obtain second flow, containing light olefins, separated from second flow, containing C4 and heavier hydrocarbons; (f) co-conditioning of first flow and second flow, containing light olefins to remove acidic gases and obtain conditioned flow; and (g) division of conditioned flow in flow of ethylene product, flow of propylene product and flow, containing C4 hydrocarbons.

EFFECT: method represents improvement of method of obtaining light olefins, achieved by reasonable combination of installation for conversion of oxygenates in olefins ("МВОЛ") with installation for pyrolysis of hydrocarbons.

10 cl, 2 dwg