Method for preparing olefins from oxygen-containing compound

Abstract

The invention discloses a method for preparing olefins from an oxygen-containing compound. The oxygen-containing compound is put into a main reactor and contacts and reacts with a regenerated catalyst from a first regenerator, and the reaction oil gas enters a separation system; a catalyst to be regenerated enters a first regenerator for regeneration, and the regenerated catalyst is recycled; C4-C8 hydrocarbons are put into an auxiliary reactor, and contact with a catalyst from a second regenerator, and then the reaction oil gas enters a separation system for separation; next, the catalyst enters the second regenerator to be regenerated and the regenerated catalyst is recycled. The method is high in selectivity of light olefins, simple in process flow and low in investment.

Description

Technical field: [0001] The invention relates to the technical field of preparing hydrocarbons from one or several non-hydrocarbon compounds, in particular to a method for preparing olefins from oxygen-containing compounds. Background technique: [0002] Light olefins mainly composed of ethylene, propylene and butadiene and light aromatic hydrocarbons mainly composed of benzene, toluene and xylene are the basic raw materials of petrochemical industry. 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 actively developing ethylene production routes with richer raw material sources. The organic oxygen-containing compound raw materials are catalyzed by metal-modified SAPO type small-...

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Problems solved by technology

[0013] In summary, in the prior art, although C in some oxygenate conversion reactions is involved 4 and C 4 + Refinery method, but there are still different catalyst systems used, and it is necessary to build an independent C with relatively high investment 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 total yield of propylene through the recycling of by-products, but most of them adopt the simple form of recycling the by-products back to the original reactor

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