Coaxial parallel flow precipitation device and method for preparing catalyst

Abstract

The invention relates to a coaxial parallel flow precipitation device and a method for preparing a catalyst. The coaxial parallel flow precipitation device comprises a casing pipe formed by an outer pipe and an inner pipe, wherein an inner pipe liquid inlet and an outer pipe liquid inlet are respectively formed in the upper ends of the inner pipe and the outer pipe; the inner diameter of an inner pipe liquid outlet is 0.3 to 1mm; the inner diameter of an outer pipe liquid outlet is 1 to 2mm; the inner pipe liquid outlet is located in a lower part with a distance from 0.5 to 1.5mm from the outer pipe liquid outlet; the inner pipe liquid inlet and the outer pipe liquid inlet are respectively connected with an injector filled with a metal salt solution and an injector filled with a precipitant solution by a guide pipe; the injectors are connected with a pushing pump; the metal salt solution is injected into the inner pipe from the inner pipe liquid inlet; the precipitant solution is injected into a hollow cavity formed between the inner pipe and the outer pipe from the outer pipe liquid inlet; the metal salt solution is mixed with the precipitant solution in the inner pipe liquid outlet to form precipitate; the precipitate is dripped, filtered, washed, dried and roasted to obtain the catalyst. The method is controllable in preparation process and is capable of quickly and efficiently mixing liquid droplets to obtain the uniform and small-particle-size catalyst.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a coaxial co-current precipitation device and a method for preparing the catalyst. Background technique [0002] The chemical precipitation method refers to the solution containing one or several cations, which exist in the solution in a homogeneous phase, adding a precipitating agent, and after the reaction, a uniform precipitation can be obtained. It is an important method for preparing metal element catalysts. It has the advantages of simple process, easy doping, and good product performance. [0003] However, in the chemical precipitation method, the mixing and feeding methods of the reaction solution have a great influence on the resulting precipitated product. [0004] The chemical precipitation reaction is generally a reaction between solution ions, so it is a fast reaction or an instantaneous reaction, so mixing has a great influence on the precipitation process. Eve...

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Problems solved by technology

However, the ordinary direct precipitation method requires aging time, and the obtained particles have a large particle size, poor monodispersity, and poor particle morphology and irregular shape.

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