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

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• 作者：Zhaoting Pu (1)
  Jie Mi (1)
  Jian Kang (1)
  Shuaiguo Zhang (1)
  
  1. Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education ; Taiyuan University of Technology ; Taiyuan ; 030024 ; P. R. China
  
• 关键词：Ultrasonication ; Ultrasound ; Coal Solvent Swelling ; Kinetics ; Activation Energy
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：32
• 期：1
• 页码：74-78
• 全文大小：310 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

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 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.