Method of stopping for unloading when cutting reactor-regeneration system in process of preparing olefins from methanol

Abstract

The invention relates to a method of stopping for unloading when cutting reactor-regeneration system in a process of preparing olefins from methanol, mainly solving the problem of being incapable of rapidly and safely uploading catalyst for reactor when cutting the reactor and regenerator existing in the prior art. The method comprises the following steps: (1) providing a reactor-regeneration system comprising a reactor, a generator, two auxiliary combustion chambers, an auxiliary heating furnace, and a catalyst storage tank, wherein, the reactor and the generator are provided with a auxiliary combustion chamber respectively; (2) cutting the catalyst circulation in the reactor-regeneration system, stopping the methanol charging, starting the auxiliary heating furnace for heating steam which enters the reactor, simultaneously switching on the auxiliary combustion chamber of the generator for supplying heat to the generator; (3) switching on the auxiliary combustion chamber of the reactor, heating the replacement medium, then cutting in the reactor, simultaneously stopping the steam charging; (4) controlling the temperature of the reactor within 300-500 DEG C, controlling the temperature of the generator within 350-550 DEG C, respectively starting the catalyst unloading lines at the bottom of the reactor to start to unload catalyst; and (5) when the temperature of the reactor-regeneration system is below 150 DEG C, opening each vent valve to purge. The method disclosed in the invention solves the problems and can be used for the industrial production of low carbon olefins.

Description

technical field [0001] The invention relates to a method for unloading and shutting down the reaction-regeneration system when the reaction-regeneration system is cut off in the methanol-to-olefins process. technical background [0002] Olefins, the present invention refers to ethylene and propylene, are two important basic chemical raw materials, and their demand is constantly increasing. Generally, ethylene and propylene are produced through petroleum routes, but due to the limited supply and high price of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop the technology of converting alternative raw materials into ethylene and propylene. Among them, an important class of alternative raw materials for the production of low-carbon olefins is oxygenated compounds, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (di...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the catalyst in the reactor cannot be quickly and safely unloaded when the two reactors are cut off, and it provides a new method for shutting down when the reaction-regeneration system is cut off in the methanol-to-olefins process method

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