Method for comprehensive utilization of cracking C4

Abstract

The invention discloses a method for comprehensively utilizing cracking carbon four. The method comprises: firstly, the cracking carbon four is subjected to selective hydrogenation reaction so that acetylene hydrocarbon and diene in the cracking carbon four are subjected to selective hydrogenation to generate mono-olefine; secondly, isobutene in the cracking carbon four reacts to generate methyl tertiary butyl ether by an etherification device; a methyl tertiary butyl ether product and a material mainly comprising butylene-1, butylene-2 and butane are obtained through separation; the materialcomprising the butylene-1, butylene-2 and butane is introduced to a butylene-1 refining system to obtain a butylene-1 product, a material containing carbon three and isobutene and a material mainly containing butylene-2 and n-butane through separation; the material mainly containing the butylene-2 and n-butane is treated to remove the butylene-2 so as to obtain a material containing the n-butane;and the material containing the n-butane is returned to a cracking furnace and is used as raw material. The method adopts selective hydrogenation, full hydrogenation, etherification, rectification, extraction and other combined technologies to fully utilize each component of the cracking carbon four, thereby obtaining largest economic benefit.

Description

technical field

[0001] The present invention relates to a kind of combined process of producing methyl tert-butyl ether (MTBE), butene-1, liquefied gas, butene-2 ​​and other products by comprehensive utilization of cracked C4 as raw material, specifically relates to a A method of comprehensive utilization of cracked C4 using combined technologies such as selective hydrogenation, full hydrogenation, etherification, rectification, and extraction. Background technique

[0002] Conventional ethylene units generally use naphtha or light hydrocarbons as cracking raw materials to obtain cracked gas through steam thermal cracking, and then enter the quenching compression separation system to obtain cracked C4 at the top of the debutanizer. Cracking C4 contains isobutane, n-butane, isobutene, butene-1, butene-2, butadiene, ethyl acetylene, vinyl acetylene and other components. The cracked C4 can be returned to the cracking furnace after hydrogenation and saturation, and can be used ...

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