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Received June 17, 2013
Accepted December 23, 2013
articles 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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Effects of ultrasonic radiation on induction period and nucleation kinetics of sodium sulfate

1Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China 2Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
zengguisheng@hotmail.com
Korean Journal of Chemical Engineering, May 2014, 31(5), 807-811(5), 10.1007/s11814-013-0290-6
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Abstract

The effects of ultrasound on crystal nucleation and particle size distribution of sodium sulfate were investigated via determining the induction period and particle size. Crystal nucleation parameters and equations for primary nucleation were calculated. The experimental results show that the induction time decreases under the ultrasound irradiation, therefore, we can get a shorter induction period at a higher supersaturation level. Based on these observations, the growth mechanism of sodium sulfate is continuous growth because the value of the surface entropy factor f is smaller than 3. The induction period was observed shorter and particle size was smaller when the ultrasonic radiation time increased. Crystal growth improved with the longer crystallization time.

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