Hydrodynamic properties of coal extracts in pyridine

V. J. Wargadalam, Koyo Norinaga, M. Iino

Research output: Contribution to journalArticle

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Abstract

Hydrodynamic properties, such as solution viscosity and diffusivity, were measured at 298 K to investigate the solution state characteristics of coal extracts in pyridine obtained from Upper Freeport (UF) and Illinois No. 6 (IL) coals. The solvation constants obtained by applying the Pal-Rhodes equation to the viscosity of the extracts in pyridine are 2.9 and 4.6 for the UF and IL extracts, respectively. A larger content of acidic hydroxyl groups in IL extract than UF extract make pyridine solvate IL extract more extensively than UF extract. However, the solvation constant of the O-methylated IL extracts is 9.3, unexpectedly larger than that of the original IL extract. To have further insight into this observation, the change in the molecular shape of the extracts by the O-methylation were examined, using the combination of intrinsic viscosity and diffusion coefficient. The shapes of the coal extracts have been found to be prolate ellipsoids with axial ratio of 6.5 and 4.0 for UF and IL extracts, respectively. The axial ratio of the O-methylated IL extract is 13.1, suggesting that the elimination of the hydrogen bonds or the steric effect of added methyl makes the shape of IL extract stretched out. This deformable nature of coal extracts makes the interpretation of the solvation constants from Pal-Rhodes equation inaccurate, as it assumes that the particles are monodispersed hard spheres.

Original languageEnglish
Pages (from-to)1123-1128
Number of pages6
JournalEnergy and Fuels
Volume15
Issue number5
DOIs
Publication statusPublished - Sep 1 2001

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Coal
Pyridine
Solvation
Hydrodynamics
Viscosity
Phosmet
Methylation
Hydroxyl Radical
Interleukin-6
Hydrogen bonds
pyridine

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Wargadalam, V. J., Norinaga, K., & Iino, M. (2001). Hydrodynamic properties of coal extracts in pyridine. Energy and Fuels, 15(5), 1123-1128. https://doi.org/10.1021/ef0100045

Hydrodynamic properties of coal extracts in pyridine. / Wargadalam, V. J.; Norinaga, Koyo; Iino, M.

In: Energy and Fuels, Vol. 15, No. 5, 01.09.2001, p. 1123-1128.

Research output: Contribution to journalArticle

Wargadalam, VJ, Norinaga, K & Iino, M 2001, 'Hydrodynamic properties of coal extracts in pyridine', Energy and Fuels, vol. 15, no. 5, pp. 1123-1128. https://doi.org/10.1021/ef0100045
Wargadalam, V. J. ; Norinaga, Koyo ; Iino, M. / Hydrodynamic properties of coal extracts in pyridine. In: Energy and Fuels. 2001 ; Vol. 15, No. 5. pp. 1123-1128.
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