Rotational flow type fluidized bed crystallizer

Abstract

The invention discloses a rotational flow type fluidized bed crystallizer. The rotational flow type fluidized bed crystallizer comprises a bed body, wherein the bed body is formed by combining a cylinder and a cone cylinder; the inner diameter of the large end of the cone cylinder is equal to that of the cylinder; the cone top of the cone cylinder is of a circular arc shape; the cone cylinder is positioned below the cylinder; the large end of the cone cylinder is connected with the lower end of the cylinder; the upper end of the cylinder is closed; a seed crystal adding opening is formed in the end surface of the upper end of the cylinder; at least two feeding pipes for adding material liquid are arranged on the side wall of the lower section of the cone cylinder and are uniformly distributed around the cone cylinder at the same height; each feeding pipe is positioned in the horizontal tangential direction of the cone cylinder; a crystal outlet is formed in the cone top of the lower end of the cone cylinder; a discharging pipe for outputting mother liquid is arranged on the side wall of the upper part of the cylinder and is positioned in the horizontal tangential direction of the cylinder, and an outlet of the discharging pipe is in accordance with the rotational direction of rotational flow formed by the material liquid. In order to meet requirements of a clearance crystallization process, a cooling jacket can be arranged on the basis of the structure.

Description

technical field [0001] The patent of the invention belongs to the technical field of crystallization of chemical engineering, and relates to a crystallizer. Background technique [0002] Crystallization is a unit operation in the preparation of chemical products. The stirred tank crystallizer is a commonly used crystallizer. Because the stirring blades of this type of crystallizer have a strong crushing effect on the crystal, the secondary nucleation rate is high, and the crystallized product The particle size is small, the particle size distribution is wide, and the crystal morphology is poor, which makes it difficult to meet the requirements of some chemical products. [0003] Theoretically speaking, to obtain crystalline products with uniform particle size and neat crystal shape, controlling the secondary nucleation is the key. For this reason, some researchers have used fluidization technology in the crystallization process to avoid the breaking of the crystal by the st...

AI Technical Summary

Problems solved by technology

For example, in the paper "Experimental Research on the Crystallization of Sandy Aluminum Hydroxide in a Spouted Fluidized Bed" published by Zhao Kun and others, the application of the spouted fluidized bed in the crystallization process was studied (see "Sichuan Metallurgy", Volume 33, No. 2, 63-66 pages), but the crystallization fluidized bed is limited to the traditional fluidized process, the turbulence inside the bed is severe, the secondary nucleation is still strong, and the crystal shape and particle size distribution of the crystallization product are still not ideal

Images