Catalyst regenerator and regeneration method for methanol aromatization process

Abstract

The invention belongs to the technical field of chemical technology process and equipment, and particularly relates to a catalyst regenerator and a catalyst regeneration method of methyl alcohol aromatization process. A multisection regeneration fluidized bed is internally and axially provided with one to a plurality of horizontal porous baffles so as to form two or a plurality of dense-phase zones for stacking catalysts; the one or a plurality of density-phase zones of the catalysts are internally provided with heat exchangers to control the temperature variation operation of gradually lowering the operation temperature in the density-phase zones which are arranged axially (from low to high); meanwhile, heat of the regenerator can be utilized comprehensively for preheating raw materials and generating steam. According to the invention, the problems of catalyst deactivation, shortening of integral service life and the like, which are caused by high-temperature scorching process, can be reduced obviously; meanwhile, the multisection regeneration fluidized bed is externally provided with a catalyst recovery system, so that catalyst particles can be recycled effectively in starting and under the working condition of instability, and the loss of the catalysts is reduced; the catalyst regenerator and the catalyst regeneration method have the characteristics of easiness in operation control and high safety.

Description

technical field [0001] The invention belongs to the technical field of chemical process and equipment, and in particular relates to a catalyst regenerator and a regeneration method for methanol aromatization process. Background technique [0002] Methanol aromatization technology is an emerging production process of aromatics. It is a process in which methanol is used as a raw material to generate aromatics such as benzene, toluene, xylene, and trimethylbenzene on a metal-molecular sieve dual-functional catalyst. The reaction temperature is 400-500°C, so the carbon deposition and deactivation of the catalyst is serious. At the same time, because the catalyst requires high acidity, high metal dispersion and activity, its deactivation phenomenon under high temperature and water vapor conditions is very serious. That is, while the deactivated catalyst needs to be regenerated by burning carbon, appropriate structure control is required to prevent the catalyst from losing its ac...

AI Technical Summary

Problems solved by technology

However, its catalyst is only a compound of Y-shaped molecular sieve and structural enhancer, which has high strength and wide temperature resistance range. Therefore, its fluidized bed structure and temperature control are not strict, and the catalyst that cannot meet the requirements of this process is due to the presence of metals. The need for a narrow temperature range

In many fixed bed carbon burning processes, the operation mode of controlling the oxygen content to carry out slow carbon burning has been proposed, but the control temperature is too low, and the heat carried by the catalyst after regeneration is small, which cannot meet the energy requirements of the endothermic reaction in the continuous reaction regeneration process.

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