Citric acid continuous cooling crystallization system and method thereof

Abstract

The invention relates to a citric acid continuous cooling crystallization system and a method thereof. In an existing method of producing citric acid monohydrate crystal, intermittent processing equipment is used, product size distribution is uneven, a crystal product is agglutinated seriously, and difference between product batches is large. According to the crystallization method, a citric acid solution is heated and concentrated through two-effect heat exchange, then is input into a circulating pipeline composed of an indirect cooler and a cooling crystallizer through a feed pump and is continuously cooled for cooling crystallization in the circulating pipeline under the action of a circulating pump, and citric acid monohydrate slurry is obtained through cooling crystallization; the citric acid monohydrate slurry is discharged through a discharging pump, conveyed to a crystal slurry buffering tank to be buffered and then input into a centrifugal separation device for solid-liquid separation. According to the continuous cooling crystallization method, intermittent crystallization operation of using a crystallization kettle for feeding and discharging and conducting cooling in the kettle in the past is replaced, the feeding, discharging and cooling flow path is stabilized, continuity and stability of product quality can be effectively ensured, and production efficiency and product quality of citric acid monohydrate are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of citric acid crystallization production, and in particular relates to a citric acid continuous cooling crystallization system and a method thereof. Background technique [0002] Citric acid has a mild and refreshing sour taste. It is widely used in the manufacture of various beverages, soft drinks, wine, candies, snacks, biscuits, canned juices, dairy products and other foods. It can also be used in chemical and textile industries, environmental protection, cosmetics and pharmaceutical industries. . [0003] At present, the main operation mode of producing citric acid monohydrate is intermittent cooling and crystallization, which specifically includes: heating and concentrating the purified citric acid solution, and then pouring the concentrated citric acid solution into multiple batch crystallization kettles respectively. The crystallization kettles are equipped with stirring, external jacket and In the ...

AI Technical Summary

Problems solved by technology

The crystallization kettle has a fast heat transfer on the wall and coil, which is easy to cause fouling and affect the heat transfer; the fouling needs to be cleaned after batch production, which reduces production efficiency

[0004] With the continuous expansion of industrialization scale, the equipment and manual operation required for the batch crystallization process of citric acid monohydrate are greatly increased. Due to the influence of unstable factors in manual operation, it is easy to cause uneven particle size distribution of citric acid monohydrate crystal products and crystal product aggregation. Serious knots and large batch-to-batch differences lead to increased difficulty in subsequent process separation, washing, and drying, which in turn affects the production cost of the final product

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