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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 3, 2008
Accepted August 3, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kinetics of nucleation and growth of L-sorbose crystals in a continuous MSMPR crystallizer with draft tube: Size-independent growth model approach

Bogusl/awa Wierzbowska Krzysztof Piotrowski^1† Joanna Koralewska Nina Hutnik Andrzej Matynia

Faculty of Chemistry, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27 50-370 Wroclaw, Poland ¹Department of Chemical and Process Engineering, Silesian University of Technology, ks. M. Strzody 7 44-101 Gliwice, Poland, Korea

Korean Journal of Chemical Engineering, January 2009, 26(1), 175-181(7), 10.1007/s11814-009-0029-6

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Abstract

The experimental data concerning kinetics of a continuous mass crystallization in L-sorbose - water system are presented and discussed. Influences of L-sorbose concentration in a feeding solution and mean residence time of suspension in a working volume of laboratory DT MSMPR crystallizer on the resulting crystal size distributions, thus on the nucleation and growth kinetics, were determined. The kinetic parameter values were evaluated on the basis of size-independent growth (SIG) kinetic model (McCabe’s ΔL law). It was observed that within the investigated range_x000D_ of crystallizer productivity (220-2,200 kg of L-sorbose crystals m^(-3)h^(-1)), a crystal product of mean size Lm from 0.22 to 0.28 mm and CV from 68.8 to 44.0% was withdrawn. The values of linear growth rate show increasing trend (from 6.6·10^(-8) to 7.6·10^(-8)m s^(-1)) with the productivity enlargement (assuming constant residence time τ =900 s). Occurrence of secondary nucleation phenomena within the circulated suspension, resulting from the crystals attrition and breakage was observed. The parameter values in a design equation, matching linear growth rate and suspension density with nucleation rate were determined.

Keywords

L-Sorbose Continuous Mass Crystallization Water Solution Draft Tube (DT) Crystallizer Size-independent Growth (SIG) Kinetic Model

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