Evaporative crystallization system for continuously producing low-density crystal substances from mixed solution and process thereof

Abstract

The invention relates to an evaporative crystallization system for continuously producing low-density crystal substances from a mixed solution and a process thereof. The evaporative crystallization system comprises a heat exchange unit, a crystallization apparatus and a circulating device, wherein the output end of the heat exchange unit is connected with the input end of the crystallization apparatus; the output end of the crystallization apparatus is connected with the input end of the heat exchange unit by virtue of the circulating device; the heat exchange unit and the crystallization apparatus are connected with a condensing unit and further connected with a vacuum unit; the crystallization apparatus is connected with a centrifugal device; and the filtrate output end of the centrifugal device is connected with the heat exchange unit. According to the evaporative crystallization system for continuously producing low-density crystal substances disclosed by the invention, the batch production manner of batch crystal kettle feeding, evaporating and discharging is replaced, the feeding and discharging balance is effectively controlled, the crystallization process is stable, the product quality is effectively ensured, the manual labor intensity is greatly reduced, and convenience is brought to production and management.

Description

technical field [0001] The invention belongs to the field of evaporative crystallization and food additives, and in particular relates to an evaporative crystallization system and a process for continuously producing low-density crystallization systems from mixed liquids. Background technique [0002] Crystallization is the process in which solid substances are precipitated from steam, solution or melt in the form of crystals. Many chemical industrial processes include crystallization as a basic unit operation. At present, the crystallization of low-density crystalline substances such as calcium propionate mostly adopts the batch crystallization method. During operation, firstly, the prepared material is transported to the crystallization kettle at one time through the feed pump, and the heating medium feed valve is opened to allow the heating medium to enter the jacket or inner coil; heat is exchanged through the outer jacket of the crystallization kettle or the inner coil ...

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Problems solved by technology

[0003] The batch crystallization process is suitable for small-scale production, and its characteristics are: the crystallization process is relatively simple, and the investment cost is relatively low, but the batch gap in the batch crystallization process is large, and it is difficult to realize automatic control, resulting in poor product quality stability and difficult control of product specifications ;With the continuous expansion of industrialization scale, the required process equipment and manual operation costs are greatly increased, and due to the influence of manual operation instability factors, the purity of crystal products is unstable, and the product coalescence is serious, which affects the quality and production cost of the final product

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