Modification of Crystal Shape through Deep Temperature Cycling

作者：Jiang Mo; Zhu Xiaoxiang; Molaro Mark C; Rasche Michael L; Zhang Haitao; Chadwick Keith; Raimondo Davide M; Kim Kwang Ki K; Zhou Lifang; Zhu Zhilong; Wong Min Hao; O'Grady Des; Hebrault Dominique; Tedesco John; Braatz Richard D^*

来源：Industrial & Engineering Chemistry Research, 2014, 53(13): 5325-5336.

DOI：10.1021/ie400859d

The evolution of particle shape is an important consideration in many industrial crystallizations. This article describes the design of temperature-cycling experiments (between alternating positive and negative supersaturations) to substantially change crystal shape with only a small number of cycles. The growth and dissolution of monosodium glutamate crystals of varying shapes were monitored using in-process attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), focused beam reflectance measurement (FBRM), particle vision and measurement (PVM), and off-line optical microscopy. The growth and dissolution kinetics were estimated in a multidimensional population balance model based on solute concentration and crystal dimension measurements. This model fitted the experimental data with a limited number of parameters of small uncertainty. In addition, with the estimated kinetic parameters, the model predicted the crystal size and shape distribution in a different temperature-cycling experiment reasonably well. In contrast to previous studies that have estimated kinetics along multiple crystal axes in mixed-tank crystallizers, this study implements dissolution terms in the multidimensional population balance model along multiple axes.

• 出版日期2014-4-2