Mass transfer of SCWO processes: Molecular diffusion and mass transfer coefficients of inorganic nitrate species in sub- and supercritical water

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Molecular diffusion coefficients of lithium-, sodium-, potassium-, cesium-, calcium-, and strontium nitrate in subcritical water were determined by analysis of Taylor dispersion profiles. Pressures ranged from 300 to 500 bar at temperatures ranging from 25{degrees}C to 300{degrees}C. The reported diffusion values were determined at infinite dilution. Molecular diffusion coefficients were 10 to 20 times faster in near-critical subcritical water than in water at ambient temperature and pressure (ATP). These findings implied that the diffusion rates were more liquid like than they were gas like, hence experimental results were correlated with diffusion models for liquids. The subcritical diffusion data presented in ... continued below

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13 p.

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Goemans, M.G.E.; Gloyna, E.F. & Buelow, S.J. April 1, 1996.

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Molecular diffusion coefficients of lithium-, sodium-, potassium-, cesium-, calcium-, and strontium nitrate in subcritical water were determined by analysis of Taylor dispersion profiles. Pressures ranged from 300 to 500 bar at temperatures ranging from 25{degrees}C to 300{degrees}C. The reported diffusion values were determined at infinite dilution. Molecular diffusion coefficients were 10 to 20 times faster in near-critical subcritical water than in water at ambient temperature and pressure (ATP). These findings implied that the diffusion rates were more liquid like than they were gas like, hence experimental results were correlated with diffusion models for liquids. The subcritical diffusion data presented in this work, and supercritical diffusion results published elsewhere were correlated with hydrodynamic diffusion equations. Both the Wilke-Chang correlation and the Stokes-Einstein equation yielded predictions within 10% of the experimental results if the structure of the diffusing species could be estimated. The effect of the increased diffusion rates on mass transfer rates in supercritical water oxidation applications was quantified, with emphasis on heterogeneous oxidation processes. This study and results published elsewhere showed that diffusion limited conditions are much more likely to be encountered in SCWO processes than commonly acknowledged.

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13 p.

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OSTI as DE96009771

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  • 2. international symposium on environmental applications of advanced oxidation technologies, San Francisco, CA (United States), 28 Feb - 1 Mar 1996

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  • Other: DE96009771
  • Report No.: LA-UR--96-1051
  • Report No.: CONF-960252--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 226432
  • Archival Resource Key: ark:/67531/metadc667757

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  • April 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 29, 2016, 4:05 p.m.

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Goemans, M.G.E.; Gloyna, E.F. & Buelow, S.J. Mass transfer of SCWO processes: Molecular diffusion and mass transfer coefficients of inorganic nitrate species in sub- and supercritical water, article, April 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc667757/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.