Start and stop method of methanol to olefin reaction-regeneration system

Abstract

The invention provides a start and stop method of a methanol to olefin reaction-regeneration system. The methanol to olefin reaction-regeneration system comprises a reactor, a regenerator and catalyststorage equipment, wherein the reactor is communicated with the regenerator; and the catalyst storage equipment is communicated with the reactor and the regenerator. The start and stop method comprises a stop process and a start process. The stop process comprises: controlling the fixed carbon content of a catalyst in the regenerator between 1.5 percent and 3.0 percent, and conveying the catalyst, having the fixed carbon content between 1.5 percent and 3.0 percent, in the regenerator to the catalyst storage equipment. The start process comprises: conveying the catalyst in the catalyst storageequipment into the regenerator for combustion reaction. According to the start and stop method, the catalyst in the regenerator is controlled to have the highest fixed carbon content in the stop process, and the part of the catalyst is conveyed into the regenerator for the combustion reaction in the subsequent start process, thereby reducing the consumption of fuel required for heating the reactor and regenerator and saving the start time.

Description

technical field [0001] The present application relates to the field of methanol-to-olefins, in particular, to a method for shutting down a methanol-to-olefins reaction-regeneration system. Background technique [0002] Methanol to Olefin (MTO for short) technology uses methanol as raw material to contact with silicoaluminophosphate molecular sieve catalyst under low reaction pressure and suitable reaction temperature conditions to produce ethylene and propylene as the main products Technology. This technology by-products methane, ethane, propane, hydrogen and other combustible gases, C4, C5 and above components, as well as trace amounts of carbon dioxide, formic acid and acetic acid and other acid gases. When passing through the quenching and washing tower, most of the acid gas is neutralized by the alkali solution, while the heavy components above carbon five and organic substances such as aldehydes, ketones and alcohols soluble in water are partially condensed, and the te...

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Problems solved by technology

[0011] The main purpose of this application is to provide a shutdown method for the methanol-to-olefins reaction-regeneration system to solve the problems of longer startup time and more energy consumed in the shutdown method in the prior art

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