Size-dependent growth kinetics model for potassium chloride from seeded chloride solution

作者：Dan Zheng, Jiao Wang, Yueqiu Shen, Meihui Yang, Menglin Xu, Yulan Ma, Yongqi Tian, Xieping Wu · 发表于：International Journal of Chemical Reactor Engineering · 年份：2022 · DOI：10.1515/ijcre-2022-0142 · 被引用次数：2 · 研究领域：Crystallization and Solubility Studies、Freezing and Crystallization Processes、Coagulation and Flocculation Studies

Abstract It was widely known that crystallization kinetics are the basis for crystallization behavior and crystallizer scale-up design. Cooling crystallization of potassium chloride was an essential unit operation in recycling industry. Some researchers have proposed the strategy of adding seed crystals for the intermittent cooling crystallization process to control the particle size and distribution of the target product. This paper studied the complex function relation between particle size and growth rate of KCI in the crystallization process in a continuous mixed-suspension mixed-product-removal (MSMPR) crystallizer at a steady state. Using the crystallization kinetics data, the mathematical models of coupling crystallization were established based on the population balance equations and mass balance equations. Since population density distributions of products behave multiform under different conditions, based on diffusion theory. The growth rate was obtained by a least square method for the multivariate linear regression, and the reliability of the kinetics model was validated experimentally. Fitting results indicated that some classical models, including several size-independent growth models and size-dependent growth models, such as Bransom, C-R, MJ2, ASL, and MJ3, could not model the size-dependent growth accurately. Based on this situation, an exponential growth model was proposed and confirmed to describe the size-dependent growth behavior. It was found that the mo...