Fluidized bed device and method for converting methanol into aromatics with different functions

Abstract

The invention discloses a fluidized bed device for converting methanol into aromatic hydrocarbons in a partitioning manner according to different functions and a method of the device. The device comprises a three-stage fluidized bed, and the device is divided into a first reaction zone, a second reaction zone and a third reaction zone from the bottom to the top and an overflow and degassing pipe connected with the first reaction zone and the third reaction zone; the three reaction zones are filled with a same catalyst, temperatures in the three reaction zones are separately controlled, so thataromatization of methanol is completed in the first reaction zone, aromatization of light hydrocarbons is completed in the second reaction zone, and aromatization of olefins and alkylation of micro methanol are completed in the third reaction zone; and at the same time, a regenerated high-temperature catalyst enters the second reaction zone, and the temperature of the second reaction zone is maintained higher than that of the first reaction zone and the third reaction zone. According to the device and method provided by the invention, a high-activity low-carbon-deposition catalyst is distributed in the second reaction zone, and a lower-activity higher-carbon-deposition catalyst is distributed in the first and third reaction zones, so that activity of each catalyst can be well matched withone corresponding temperature zone, high-efficient methanol conversion can be realized, a yield of aromatic hydrocarbons can be improved, and the content of propane in an outlet of a reactor can be reduced; and the device has the characteristics of less recycled materials and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of chemical process and equipment, and in particular relates to a fluidized bed device and method for converting methanol into aromatic hydrocarbons with different functions. Background technique [0002] Methanol aromatization technology is an emerging aromatics production process, which uses methanol as the main raw material to generate aromatics (mainly benzene, toluene, xylene) on molecular sieve, metal-molecular sieve, or metal oxide-molecular sieve catalysts. , trimethylbenzene, etc.) process. The product is controlled by the double-pool hydrocarbon mechanism in the molecular sieve. The primary products include the above-mentioned aromatics, and small molecular olefins and alkanes, resulting in a low primary yield of aromatics. It has been reported that the above products are separated and transformed separately. However, when alkanes are transformed into aromatics again, it is a high-temperature, st...

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Problems solved by technology

However, if there is a trace amount of methanol, the difficulty of wastewater treatment will increase significantly

At the same time, with the deactivation of carbon deposits on the catalyst, the conversion rate of methanol will also decrease. In a fluidized bed with severe gas-solid back-mixing, the complete conversion of methanol cannot be achieved.

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