Quantitative Identification of Nucleation and Crystal Growth Stages in Batch Crystallization from Solution

Abstract

Abstract: For improving the precision of kinetic parameter estimation and further research of the mechanism, it was very important to identify nucleation and crystal growth stages quantitatively in the batch crystallization from solution. The dimensionless variables of K and K^* were described based on the difference of crystal number and its size contributing to the second and third moments of crystal size distribution(CSD), respectively. For a typical seeded crystallization of potassium nitrate in water reported in the literature, the simulated results showed that both K and K^* had a similar tendency and were also close during the crystallization process, and monotonously decreased in the nucleation stage and increased in the crystal growth stage. The solute concentration and transmittance were determined for an unseeded batch cooling crystallization of KNO₃-H₂O solution, and K^* was applied to identify the nucleation and crystal growth stages. It was noted that the crystal growth stage obtained by K^* agreed well with that by linear growth rate model. Compared with K simulated on the CSD and kinetic parameters, K^* could be calculated directly from relevant on line information such as solute concentration and transmittance, and therefore should be much more convenient and feasible.

Key words: Solution batch crystallization, Nucleation stage, Crystal growth stage, Quantitative identification

CLC Number:

TQ026.5

TrendMD:

HUANG Pei, HUANG De-Chun, XU Nan-Ping, SHI Jun . Quantitative Identification of Nucleation and Crystal Growth Stages in Batch Crystallization from Solution[J]. Chem. J. Chinese Universities, 2004, 25(3): 504.

References

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