Improved DMTO reactor

Abstract

The invention discloses an improved DMTO reactor. According to the invention, by means of arrangement of a grating in a dense-phase bed layer zone of the DMTO reactor, entrainment amount of a catalyst is reduced and the concentration of the catalyst in a dilute-phase bed layer is reduced, so that a secondary reaction is reduced. Meanwhile, bubbles are reduced in size so that the disturbance on the bed layers is reduced when the bubbles are broken, so that the bed layers are more stable and reduced in backmixing. By means of the technical scheme, selectivity of methanol to olefin is increased, thereby increasing the yield of olefin.

Description

technical field [0001] The invention relates to the field of chemical equipment, in particular to an improved DMTO reactor. Background technique [0002] DMTO is a method of producing low-carbon olefins through methanol under the action of a catalyst. The reaction occurs on the surface of the catalyst, and a large amount of heat is released during the reaction. At the same time, the coke produced by the reaction is accumulated on the surface of the catalyst, so that the catalyst is quickly deactivated, and the catalyst can recover its activity after being burnt. The gas and solid phase fluidized bed catalytic reactor has the advantages of high catalytic conversion rate, uniform temperature distribution in the bed, and convenient catalyst replacement. These advantages are just in line with the DMTO process, and the natural gas and solid phase fluidized bed catalytic reactor has become the preferred reactor for the DMTO process. The distribution of the catalyst inside the ...

AI Technical Summary

Problems solved by technology

Such a catalyst distribution is not suitable for the DMTO reaction, too much catalyst is distributed from the transition section to the top of the dilute bed, serious back-mixing, and secondary conversion of olefins are easy to occur, all of which affect the olefin selectivity of methanol

The reason for the above problems is that the DMTO reactor works in the bubbling bed state, the bubbles cause a large amount of entrainment, the bubbles break at the bed interface, and part of the catalyst is ejected into the dilute phase, thereby increasing the density of the catalyst in the dilute phase , increasing the secondary reaction of alkenes

At the same time, the rupture of large bubbles will cause a large disturbance to the air flow, resulting in large fluctuations in the bed and serious back mixing.

All of the above will affect the selectivity of methanol to olefins, thereby reducing the yield of olefins

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