Application of static mixer in nitrotoluene gas-phase catalytic hydrogenation process

Abstract

The invention discloses an application of a static mixer in a nitrotoluene gas-phase catalytic hydrogenation process, which comprises the following process steps: S1, preparing materials: preparing a nitrotoluene, hydrogen and the static mixer, and fixedly connecting a nitrotoluene connecting pipe and a hydrogen connecting pipe to one end of the static mixer through a flange plate; S2, heating reaction: introducing nitrotoluene and hydrogen into a static mixer for mixing reaction, wherein a heating device mounted at the outer end of the static mixer controls rapid heating gas phase catalysis; S3, additionally arranging a mixer; S4, stirring and mixing; and S5, fluidized bed reaction: after gasification, feeding into a boiling fluidized bed for hydrogenation reaction to finally generate methylaniline, and directly collecting by adopting a collecting tank. The invention discloses the application of the static mixer in a nitrotoluene gas-phase catalytic hydrogenation process, and aims to mix nitrotoluene with hydrogen, heat and gasify the mixture and then enter a boiling fluidized bed for hydrogenation reaction, so that the service life is prolonged, few byproducts are produced, the service life period is long, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of methylaniline production, in particular to the application of a static mixer in the gas-phase catalytic hydrogenation process of mononitrotoluene. Background technique [0002] A static mixer is a high-efficiency mixing device without moving parts. Its basic working mechanism is to use the mixing unit fixed in the tube to change the flow state of the fluid in the tube, so as to achieve good dispersion and full mixing of different fluids. The device is versatile and cannot be disassembled. Mononitrotoluene, the name of the chemical substance, is a nitrated compound of toluene, or it can be said to be a methylated compound of nitrobenzene. Its chemical formula is C6H4(CH3)(NO2). Gas phase belongs to partition chromatography or adsorption chromatography, which is only suitable for analyzing and separating volatile and low volatile substances. The stationary phase is covered with a layer of high boiling po...

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Problems solved by technology

[0003] At present, the common process in the industry is that the mixed gas after gasification directly enters the fluidized bed, and the mixed gas entering the bed cannot be guaranteed to be completely and evenly mixed as much as possible, resulting in uneven reaction and many by-products. At the same time, the catalyst is more likely to deactivate, resulting in a catalyst. The one-way life cycle is too short and the production cost increases

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