Continuous crystallizing tank and continuous evaporative crystallization process

Abstract

The invention relates to the field of chemical production, and discloses a continuous crystallizing tank and a continuous evaporative crystallization process. The continuous crystallizing tank comprises a tank body, a first sleeve which has the lateral surface only and is positioned in the tank body, a second sleeve which has the lateral surface only and is positioned in the first sleeve and a stirrer, wherein side walls of the tank body, the first sleeve and the second sleeve are parallel with each other and do not contact with each other, and the first sleeve and the second sleeve do not contact the bottom of the tank body; the top of the side wall of the first sleeve is connected with the side wall of the tank body by an annular metal plate in a closed mode; the stirrer is positioned in the second sleeve, and the second sleeve and the stirrer are fixed by a support; a first feeding hole and a first discharge hole are formed in the side wall of the tank body, and a first crystal discharge hole is formed in the bottom of the tank body; the first feeding hole is positioned above the annular metal plate; the first discharge hole is positioned between the annular metal plate and the bottom of the side wall of the first sleeve; and the first discharge hole is communicated with the first feeding hole. By the crystallizing tank, continuous evaporative crystallization is realized, crystals are uniform in sizes, and steam consumption is reduced.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a continuous crystallization tank and a continuous evaporation crystallization process. Background technique [0002] Evaporation and crystallization means evaporating the solvent, changing the solution from unsaturated to saturated, and continuing to evaporate, the excess solute will be precipitated in the form of crystals. Evaporation and crystallization technology is a conventional technology for separating solid products from liquids. It is often used in the production of pharmaceuticals, food and other chemical products, such as chemical reagents, drugs, amino acids, monosodium glutamate, etc., all involve evaporation and crystallization. [0003] Taking monosodium glutamate as an example, its production usually first uses bacterial strain fermentation to prepare L-glutamic acid fermentation broth, then extracts L-glutamic acid from the fermentation broth, obtains L-sodium...

AI Technical Summary

Problems solved by technology

However, the existing crystallization tank is only a closed container with a stirring device. This structure determines that the existing evaporative crystallization process can only carry out the crystallization of the next batch of products after the crystallization of one batch of products is completed. Unable to achieve continuous crystallization, resulting in greatly reduced production efficiency of monosodium glutamate

At the same time, because the steam is continuously fed into the crystallization tank during the crystallization process, the energy consumption of the existing process is too large

In addition, the size of crystal forms precipitated in the crystallization process of the existing technology is different, which makes the uniformity of monosodium glutamate particles poor and the product quality is not high

[0004] The above problems not only exist in the production process of monosodium glutamate, but also in the production of other products that require evaporation and crystallization, which greatly restricts the production efficiency of products

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