Gas-liquid-solid three-phase stirred tank reactor

Abstract

The invention provides a gas-liquid-solid three-phase stirred tank reactor which comprises a tank body, a stirring shaft is inserted into the top of the tank body, the stirring shaft is sequentially provided with a funnel, an inclined blade stirring paddle, a first steering cone-shaped body, a second steering cone-shaped body and a flow guide refining paddle from top to bottom, a plurality of flow guide refining plates are uniformly distributed on the outer side of a cavity in the tank body, and a gas ejector is arranged at the bottom of the kettle body. According to the gas-liquid-solid three-phase stirring tank type reactor, the inclined blade stirring paddle executes gas-liquid diffusion and reaction liquid pumping effects in the rotating process, the flow guide refining paddle executes the flow guide and particle and bubble refining effects in the rotating process, and the flow guide refining plate executes the flow guide and particle and bubble refining effects; by the effects of the above components in the gas, liquid and solid phases, large-scale axial and radial movement and molecular-level mixing are formed in the reactor, so that reaction materials are distributed more uniformly, reaction is performed more thoroughly, reaction heat release is more uniform, and meanwhile, the backmixing degree is reduced by large-scale circulating flow.

Description

technical field [0001] The invention belongs to the technical field of glycine production, in particular to a gas-liquid-solid three-phase stirred tank reactor. Background technique [0002] Glycine is an amino acid with the simplest structure in the amino acid series. It has both acidic and basic functional groups in the molecule. It is soluble in polar solvents, but hardly soluble in non-polar solvents. Glycine is an important organic chemical raw material, which can be used in food, feed, pharmaceutical processing and other fields. [0003] At present, industrialized and industrialized glycine production processes mainly include chloroacetic acid ammonolysis method, Streck method, hydrogen cyanide method and biosynthesis method. The ammonolysis method of chloroacetic acid uses urotropine as a catalyst, chloroacetic acid and ammonia as raw materials, and undergoes ammonification, mixed crystal separation, mother liquor recovery, glycine refining and other processes to obt...

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Problems solved by technology

[0007] (3) With the precipitation of solid glycine and solid ammonium chloride in the reaction liquid, the momentum transfer in the reactor is also more complicated, and the influence of solids on the reaction is mainly concentrated in the space that solids will occupy the gas phase, thereby affecting gas-liquid mass transfer At the same time, due to the high density of solids, some of them will be deposited at the bottom of the reactor, forming a dead zone, or even blocking the discharge port, affecting the normal progress of the reaction

[0008] At the same time, it should be emphasized that the chloroacetic acid solution is obviously acidic. Although the pH of the reaction solution needs to be controlled between 6.0-7.5 during the reaction process, special consideration should be given to the corrosion resistance of the reactor.

In addition, the traditional stirred tank reactor has the characteristics of a large degree of back-mixing, which makes materials with different residence times mix, which adversely affects the progress of the reaction.

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