结晶器技术 强制循环结晶器

化工行业使用的 FC 结晶器

强制循环结晶器 (FC) 是该行业最常用的一种结晶器

FC 结晶器

Oxon NaCl FC

普通的 FC 结晶器会蒸发溶剂,从而提高工艺溶液的过饱和度,并导致发生结晶现象。大部分传统的 FC 装置在真空环境或轻微的超大气压环境下运行。The FC consists of four basic components: the crystallizer vessel, which provides most of the volume dictated by the residence time requirements, the circulating pump, which provides the mixing energy, the heat exchanger, which supplies energy to the crystallizer (in a typical evaporative crystallization operation), and the vacuum equipment, which handles the vapors generated in the crystallizer. Slurry from the crystallizer vessel is circulated, in plug flow fashion, through the heat exchanger, and returned to the crystallizer vessel again, where its supersaturation is relieved by deposition of material on the crystals present in the slurry. The supersaturation is controlled so as to avoid spontaneous nucleation, by sufficient circulation capacity.

The evaporated solvent is conducted to the vacuum system, where it is condensed and removed. 

 

The FC crystallizer is used for general, simple crystallization operations, where large crystal size is not a requirement. The FC design aims to protect the crystal size from reduction from the crystallizer environment, but has no features to aggressively increase the crystal size.

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