Effects of particle size on the desorption kinetics of water from Beulah-Zap lignite coal: Differential scanning calorimetry results

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The drying kinetics of water from three particle-sized Beulah-Zap lignite coal samples were probed using the differential scanning calorimetry technique at 295 < T < 480 K. The measurements undertaken under flowing N{sub 2} gas environment indicate that water is lost from this coal by two independent but simultaneously operative kinetic mechanisms. Our results suggest that the unimolecular decay kinetics are obeyed by those water molecules which are near the mouths of large pores and/or surround the coal particles. Most of the water, about 80% of the water lost in our experiments, was removed via a 2nd-order diffusion mechanism. As ... continued below

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27 p.

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Dang, Yuhong; Malhotra, V. M. & Vorres, K. S. March 1996.

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The drying kinetics of water from three particle-sized Beulah-Zap lignite coal samples were probed using the differential scanning calorimetry technique at 295 < T < 480 K. The measurements undertaken under flowing N{sub 2} gas environment indicate that water is lost from this coal by two independent but simultaneously operative kinetic mechanisms. Our results suggest that the unimolecular decay kinetics are obeyed by those water molecules which are near the mouths of large pores and/or surround the coal particles. Most of the water, about 80% of the water lost in our experiments, was removed via a 2nd-order diffusion mechanism. As expected, the desorption activation energies of the 2nd-order diffusion kinetics were much larger than the decay mechanism`s activation energies. Our results also suggest, at least for particle sizes < 841 {mu}m, < 106 {mu}m, and < 37 {mu}m, that the coal particle size has little effect on the desorption activation barriers.

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27 p.

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OSTI as DE96007614

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  • Other Information: PBD: [1996]

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  • Other: DE96007614
  • Report No.: ANL/CHM/PP--80678
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/206632 | External Link
  • Office of Scientific & Technical Information Report Number: 206632
  • Archival Resource Key: ark:/67531/metadc669907

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  • March 1996

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 7, 2015, 4:17 p.m.

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Dang, Yuhong; Malhotra, V. M. & Vorres, K. S. Effects of particle size on the desorption kinetics of water from Beulah-Zap lignite coal: Differential scanning calorimetry results, report, March 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc669907/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.