Modeling of metastable zone width behavior with dynamic equation

Dae Ryook Yang, Kwang S. Lee, Ju S. Lee, Sung G. Kim, Do H. Kim, Yoo K. Bang

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Identification of the metastable zone width (MZW) is crucial for product quality control in industrial crystallization. Traditionally, the MZW in batch cooling crystallization has been defined as a kind of static property of a solution that primarily depends on cooling rate. In industrial batch crystallization operations, however, the cooling rate does not remain constant but changes with time based on the operation recipe. The existing models with static relationship between MZW and cooling rate have a limit to predict the behavior of the MZW under such a dynamic situation. In this study, the MZW is newly elucidated as a dynamic state that predominantly depends on the cooling rate among other operating variables. For this, a first-order dynamic model with input nonlinearity has been proposed between the cooling rate and the MZW. To verify the proposition, a series of experiments have been conducted for crystallization of ammonium sulfate, potassium aluminum sulfate, and potassium chloride under various cooling scenarios. From our experiments, it is observed that (1 ) holding temperature after cooling affects the nucleation time, (2) undersaturated starting temperature of cooling affects the nucleation temperature, and (3) solution thermal history before saturation temperature also affects the nucleation temperature.

Original languageEnglish
Pages (from-to)8158-8165
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume46
Issue number24
DOIs
Publication statusPublished - 2007 Nov 21

Fingerprint

Cooling
cooling
Crystallization
modeling
crystallization
nucleation
Nucleation
temperature
Potassium
Temperature
Saturation (materials composition)
potassium chloride
Potassium Chloride
Ammonium Sulfate
ammonium sulfate
quality control
nonlinearity
Quality control
Dynamic models
potassium

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

Cite this

Modeling of metastable zone width behavior with dynamic equation. / Yang, Dae Ryook; Lee, Kwang S.; Lee, Ju S.; Kim, Sung G.; Kim, Do H.; Bang, Yoo K.

In: Industrial and Engineering Chemistry Research, Vol. 46, No. 24, 21.11.2007, p. 8158-8165.

Research output: Contribution to journalArticle

Yang, Dae Ryook ; Lee, Kwang S. ; Lee, Ju S. ; Kim, Sung G. ; Kim, Do H. ; Bang, Yoo K. / Modeling of metastable zone width behavior with dynamic equation. In: Industrial and Engineering Chemistry Research. 2007 ; Vol. 46, No. 24. pp. 8158-8165.
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