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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 October 17, 2013
Accepted July 9, 2014

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 and activation energy of solvent swelling of coal altered by an ultrasonication-enhanced process

Zhaoting Pu Jie Mi^† Jian Kang Shuaiguo Zhang

Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China

mijie111@163.com

Korean Journal of Chemical Engineering, January 2015, 32(1), 74-78(5), 10.1007/s11814-014-0189-x

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Abstract

We studied the kinetics and activation energy of solvent swelling in Qinyuan and Xiongshan coal in perchloroethylene (PCE) using conventional and ultrasonication-enhanced treatment conditions. Kinetic parameters suggested that both coal types exhibited anomalous diffusion regardless of treatment conditions. However, the kinetic parameter n, an exponent that crudely indicates the nature of the solvent diffusion process, decreased with the addition of ultrasound in both coal types. We suggest this change is due to the greater diffusion of PCE into coal during_x000D_ ultrasonication based on greater relaxation of the coal macromolecular network and microscopic agitation of the liquid solvent. Activation energy of coal solvent swelling decreased for both coal types with the addition of sonication, indicating that the energy barrier for the process was reduced in the presence of ultrasound.

Keywords

Ultrasonication Ultrasound Coal Solvent Swelling Kinetics Activation Energy

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