System and process for preparing olefin from oxygen-contained compound for reducing catalyst coking

Abstract

The invention discloses a system for preparing olefin from an oxygen-contained compound for reducing catalyst coking. The system comprises at least one reactor, at least one regenerator, at least one deactivated catalyst conveying pipeline and at least one regenerated catalyst conveying pipeline, wherein a part, close to the regenerator, of the regenerated catalyst conveying pipeline comprises at least two branch pipes, a part, close to the reactor, of the regenerated catalyst conveying pipeline comprises at least one guide pipe, the branch pipes are communicated with the guide pipe, at least one of the branch pipes is provided with at least one indirect heat exchanger for cooling a regenerated catalyst entering into the branch pipe, and the cooled regenerated catalyst is mixed with the regenerated catalyst from other branch pipes in a connecting area between the branch pipe and the guide pipe and enters into the reactor through the guide pipe, so as to prevent overtemperature of the regenerated catalyst entering into the reactor and prevent the surface of the regenerated catalyst from being quickly carbonized when the regenerated catalyst is in contact with the oxygen-contained compound in the reactor.

Description

technical field [0001] The present invention relates to a system and process for producing olefins from organic oxygen-containing compounds, such as methanol and / or dimethyl ether, in particular, to a system and process for producing olefins from organic oxygen-containing compounds with reduced catalyst coking. Background technique [0002] The technology of organic oxygen-containing compounds, such as methanol and / or dimethyl ether to olefins, has opened up a new process route for the production of basic organic chemical raw materials from coal, and the typical technology is methanol to olefins (MTO). Generally speaking, the MTO technology package consists of reaction technology and separation technology. Reaction technology is centered on catalyst development and reactor development and design, and methanol is used as raw material to produce olefin mixture; while product distribution and purity requirements are the basis for developing separation processes. [0003] The M...

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Problems solved by technology

[0014] Therefore, there is an urgent need for a practical and simple solution to the problem of rapid coking of the catalyst surface caused by the high temperature of the catalyst particles for the production of olefins from organic oxygenates into the reactor.

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