Fluidized bed purification method and device for methanol-to-olefin purified water

Abstract

The invention relates to a fluidized bed purification method and device for methanol-to-olefin purified water. The fluidized bed purification method for the methanol-to-olefin purified water comprises the following steps: (i) feeding product gas to a quench tower for washing and cooling, and washing most of fine catalyst powder entrained in the product gas into quenched water; (ii) feeding the product gas obtained in the step (i) into a water washing tower for washing; (iii) recycling a part of the quenched water obtained in the step (i) and washing water obtained in the step (ii), discharging a part of the quenched water and the washing water into a stripping tower, and conducting stripping to obtain purified water; (iv) further purifying the purified water obtained in the step (iii) through a fluidized bed separator; (v) after the fluidized bed separator continuously runs for a period of time, regenerating a separation medium in the fluidized bed separator through reverse feeding of purified water of the stripping tower; and (vi) further concentrating catalyst slurry concentrated by the fluidized bed separator. The invention also provides the fluidized bed purification device for the methanol-to-olefin purified water.

Description

technical field [0001] The disclosure belongs to the technical field of high-concentration refractory sewage treatment, and relates to a methanol-to-olefin purification water treatment method, which is suitable for removing and concentrating particulate matter in methanol-to-olefin purification water. Specifically, the present disclosure provides a ebullated bed purification method and device for methanol-to-olefins purification water. Background technique [0002] Methanol to Olefins, referred to as MTO (Methanol to Olefins) refers to the process of preparing light olefins through catalytic reaction using methanol as raw material. The reaction is generally realized by a fluidized bed reactor, and the currently used catalyst is SAPO-34 molecular sieve. Part of the catalyst particles will be entrained in the reaction product gas, and the catalyst is currently recovered through a three-stage or four-stage cyclone separator. The product gas recovered by the catalyst is then s...

AI Technical Summary

Problems solved by technology

[0009] This disclosure provides a novel methanol-to-olefins purified water ebullating bed purification method and device. By adding a set of purified water ebullating bed separation device after the stripping tower, the fine catalysts and heavy hydrocarbons in the purified water are removed to reduce the The burden of sewage treatment is small, and the purpose of concentrating the spent catalyst and purifying the purified water of the methanol-to-olefins plant is realized. This method is simple and effective, and solves the problems of incomplete separation, short equipment operation period and high operation cost in the existing method

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