Kinetic study on solvent swelling of coal particles
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- 作者：Satoru Murata ; Toshifumi Sako ; Tomohiro Yokoyama ; Hong Gao ; Koh Kidena ; Masakatsu Nomura
- 关键词：Solvent swelling ; Coal particles ; Kinetics ; Activation energy
- 刊名：Fuel Processing Technology
- 出版年：2008
- 出版时间：April 2008
- 年：2008
- 卷：89
- 期：4
- 页码：434-439
- 全文大小：469 K
文摘
Solvent swelling experiments of coal particles of Taiheiyo and Witbank coals in pyridine at 15–50°C were conducted by using an orthogonal microscope coupled with an image analysis system and the newly prepared temperature-controlled cell. Two kinetic parameters, n (a number that crudely indicates the nature of the solvent diffusion) and k (a rate constant), were calculated based on time profile of volumetric swelling ratio. The authors examined the correlation between these parameters and volumetric swelling ratios, to find that there was linear correlation between n and ln(1/k). By using the proportional constant, the authors calculated activation energy of the swelling of both coals. The energy changed with respect to each particle. Average values were 71kJ/mol for Taiheiyo coal and 55kJ/mol for Witbank coal, these values agree well with the values reported in the literature. The authors also examined the effects of pretreatments of both coals. O-Acetylation and pyridine pre-extraction lead to decrease the energies drastically.