Moving bed coke-burning regeneration method for methanol-to-gasoline catalyst

Abstract

The invention discloses a moving bed coke-burning regeneration method for a methanol-to-gasoline catalyst. The method comprises the following steps: a spent catalyst from outside of a regenerator or a regenerator buffer area enters a radial catalyst moving bed coke-burning zone by gravity; the coke-burning zone is divided into two segments including an upper coke-burning segment and a lower coke-burning segment; the catalyst which is burned by the upper coke-burning segment and the lower coke-burning segment of the coke-burning zone enters a drying zone by gravity, in order to complete the coke-burning regeneration process of the spent catalyst; the regenerated catalyst can be recycled; regeneration gas which completes coke burning in the coke-burning zone and drying gas from the drying zone of the regenerator are led out together from the upper part of the regenerator, and after heat transfer, cooling, drying and compression are carried out for the gas, the gas is divided into three paths, wherein after a first path is supplemented with air, the gas is heated to 350-400 DEG C and enters the upper coke-burning segment of the regenerator, after a second path is supplemented with air, the gas is heated to 360-410 DEG C and enters the lower coke-burning segment of the regenerator, and the third path is used as drying gas and enters the drying zone of the regenerator. The method can effectively control the temperature of a coke-burning bed layer of the regenerator, and prolongs service life of the catalyst.

Description

technical field [0001] The invention relates to the field of catalyst regeneration in coal chemical industry, that is, for the reaction of converting methanol into hydrocarbons using moving bed technology, including: methanol-to-gasoline (MMTG) or methanol-to-aromatics (MMTA) and other reactions to generate high-carbon standby catalyst regeneration Scorch method. Background technique [0002] At present, in the field of coal chemical industry, technologies such as methanol to gasoline (MTG) and methanol to aromatics (MTA) are research hotspots at home and abroad. The significance of these routes lies in the efficient chemical utilization of coal resources on the one hand, and on the other hand to solve the situation of high dependence on imports of related products caused by the shortage of oil resources. Therefore, the partial replacement of oil supply by synthesizing hydrocarbons from methanol has attracted great attention. [0003] In the conversion of methanol into hyd...

AI Technical Summary

Problems solved by technology

Such as local overheating of the catalyst bed, excessive pressure drop of the bed, intolerance to dust clogging, difficult switching operation and high catalyst recovery cost, etc.

Although the fluidized bed is more conducive to the reaction in terms of transfer, the inevitable catalyst wear and separation problems have always been troublesome engineering problems

In this method, the regenerator is one-stage coke, oxygen is injected once, there is no drying zone, there is no effective means to control the temperature of the regenerator coke bed, and there is no catalyst roasting and drying process

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