Device for producing alkene from oxygenated compound

Abstract

The invention discloses a device for producing alkene from an oxygenated compound. The device comprises a main reactor, an auxiliary reactor, a first regenerator and a second regenerator, wherein the main reactor is communicated with the first regenerator through a first to-be-generated catalyst conveying pipe and a first regenerated catalyst conveying pipe; the auxiliary reactor is communicated with the second regenerator through a second to-be-generated catalyst conveying pipe and a second regenerated catalyst conveying pipe. According to the device disclosed by the invention, the selectivity of low-carbon alkene is high, the process flow is simple, and the investment is small.

Description

Technical field: [0001] The invention relates to the technical field of preparing hydrocarbons from one or several non-hydrocarbon compounds, in particular to an oxygen-containing compound production olefin device. 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-pore alum...

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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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