Melting crystallizer

Abstract

The invention relates to a melting crystallizer which comprises a cylinder body (6), an outer pipe (8), an upper sealing head (20), a lower sealing head (3), a middle pipe box (14) and an inner pipe box (17). According to the melting crystallizer provided by the invention, a pipe-layer heat medium flow passage is arranged on the inner side of a crystalline material flow passage, and a shell-layer heat medium flow passage is arranged on the outer side of the crystalline material flow passage, so that the heat transfer area of crystalline materials and heat transfer media is effectively increased. Therefore, the upper and lower temperature gradient of a crystallization pipe is small, and the crystallization effect is ensured; since two annular crystallization surfaces are arranged inside the one crystallization pipe, the thickness of a crystallizing layer can be decreased effectively after crystal formation, the heat transfer effect between the crystalline materials and the heat transfer media is strengthened, and meanwhile, the crystallization area is increased, and the productivity of the crystallizer is improved.

Description

technical field [0001] The invention relates to a melting crystallizer, which is used in the occasions involving the use of dynamic melting crystallization to purify substances in the chemical production process. The invention belongs to the technical field of chemical separation. Background technique [0002] There are a large number of material separation operations in the chemical, food, pharmaceutical and material industries. The conventional separation methods include rectification, extraction and solution crystallization. With the improvement of material purity requirements and the emergence of difficult-to-separate systems, conventional separation methods cannot be used to purify and separate systems. Melt crystallization can play its special role when it is sensitive to temperature or the separation system does not allow the presence of solvents. . In recent years, melt crystallization has developed on a large scale. Its common applications include the separation o...

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Problems solved by technology

[0003] The utility model patent "melting crystallizer" whose application number is 201120377828.0 disclosed by the Chinese patent has the following deficiencies: 1. Since the guide tube is only arranged outside the crystallization tube, the heat transfer area between the crystallization material and the heat transfer medium 2. The crystallization layer is only distributed on the inner wall of the crystallization tube, so after the crystallization layer is formed, its thickness is thicker, which reduces the crystallization material and the heat transfer medium. Heat transfer effect, at the same time, the product has a high impurity content due to the large amount of inclusions

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