4.4 Article

Development of a Novel Supersaturation Monitoring System in Continuous Crystallization of KAl(SO4)2•12H2O

Journal

CHEMICAL ENGINEERING & TECHNOLOGY
Volume 45, Issue 5, Pages 985-989

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/ceat.202100643

Keywords

Continuous crystallization; Potassium aluminum sulfate dodecahydrate; Supercooling; Supersaturation monitoring

Funding

  1. Katsuragi Industry Co., Ltd.

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Continuous crystallization of potassium aluminum sulfate dodecahydrate via indirect cooling was conducted using a draft tube-type crystallizer with a circulation flow path. The degree of supersaturation in the circulation channel was monitored using a newly designed system. The crystal growth rates calculated by the population balance model and the supersaturation monitor showed slight differences but were close. This system has potential applications in industrial crystallization with impurities.
Continuous crystallization via indirect cooling of potassium aluminum sulfate dodecahydrate (KAl(SO4)(2)center dot 12H(2)O) was carried out using a draft tube-type crystallizer with a circulation flow path. The crystallizer was equipped with a newly designed system to monitor the degree of supersaturation in the circulation channel. The average degree of supercooling and growth rate were measured. The crystal growth rates calculated by the population balance model and the supersaturation monitor were different but close. The average supersaturation calculated from the supercooling degree and the solubility data in the literature was 0.19 g per 100 g H2O. This system is also expected to be applied to industrial crystallization where impurities are present.

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