PRODUCING 1-BUTENE IN APPARATUS FOR CONVERTING OXYGEN-CONTAINING COMPOUNDS TO OLEFINS Russian patent published in 2014 - IPC C07C2/86 C07C1/20 C07C4/06 C07C11/08 C07C11/04 C07C11/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing light olefins, which comprises: (a) passing oxygen-containing feedstock into a reactor for converting oxygen-containing compounds to olefins, such that the oxygen-containing feedstock comes into contact with a molecular sieve-based catalyst and is converted to light olefins, which come out of said reactor in the form of an effluent stream; (b) dividing the effluent stream into a first stream of light olefins and a first stream containing C4 or heavier hydrocarbons separate from the first stream; (c) selective hydrogenation and subsequent cracking of the first stream containing C4 or heavier hydrocarbons to obtain a first effluent stream of cracking gases containing light olefins; (d) separate cracking of the hydrocarbon stream to obtain a second effluent stream of cracking gases containing light olefins; (e) combined fractionation of he first and second effluent streams of cracking gases to obtain a second stream containing light olefins, separate from the second stream containing C4 or heavier hydrocarbons; (f) combined treatment of the first and second streams containing light olefins to remove acidic gases and obtain a treated stream; (g) dividing the treated stream into an ethylene product stream, a propylene product stream and a stream containing C4 hydrocarbons; and (h) optional selective hydrogenation of the stream containing C4 hydrocarbons, and subsequent fraction of the optionally selectively hydrogenated stream to separate a 2-butene stream from the first 1-butene stream. The invention also relates to a method of extracting 1-butene from a stream of C4 hydrocarbons, which uses the method described above.

EFFECT: method is an improved process of obtaining light olefins through smart combination of an apparatus for converting oxygen-containing compounds to olefin with a hydrocarbon pyrolysis apparatus.

17 cl, 4 dwg