Conversion method of C4 and heavier components

Abstract

The invention discloses a conversion method of C4 and heavier components, thereby improving the yield of ethylene and propylene. The method carries out further cracking on the C4 and the heavier components separated from reaction gas, a catalyst used for cracking is the same with the catalyst of the main reaction, and a cracking device comprises an auxiliary reactor and / or an auxiliary regenerator. The use of the method can improve the total selectivity of ethylene and propylene to 85-90%, and the weight ratio of ethylene to propylene in products can be flexibly regulated between 1.2 and 0.8.

Description

Technical field: [0001] The present invention relates to a kind of oxygen-containing compound (mainly methanol, ethanol, dimethyl ether, C 4 ~C 10 Alcohol compounds or their mixtures, etc.) as raw materials, in the continuous reaction and regeneration process of generating light olefins as the main stream (mainly ethylene and propylene), the by-product carbon four and heavier components (C 4 + ) further react the method for producing ethylene and propylene. Background technique: [0002] Light olefins (ethylene, propylene, butadiene) and light aromatics (benzene, toluene, xylene) are the basic raw materials for petrochemicals. At present, ethylene production mainly relies on the tube furnace steam cracking process of light naphtha raw material. Due to the shortage of crude oil resources and the increasing price, naphtha resources have become more and more insufficient, and the production cost of low-carbon olefins is getting higher and higher. At home and abroad, we are...

AI Technical Summary

Problems solved by technology

[0016] In summary, although the prior art involves carbon four and heavier components (C 4 + ) back refining method, but there are still many problems: including the use of different catalyst systems, the need to build an independent C 4 + Cracking unit, heat imbalance of olefin cracking system, need to specialize for C 4 + The cracking unit provides the required heat, the cracking conditions are limited, and the conversion rate is low; only focus on the C in unconverted raw materials and products 5 + components, usually does not involve the recycling of butene; there are also some technologies aimed at propylene to increase the overall yield of propylene through by-product recycling, but most of them adopt a simple form of recycling by-products back to the original reactor, etc.

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