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Residence time distributions with a radiotracer in a hydrotreating pilot plant: Upflow versus downflow operation

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Title: Residence time distributions with a radiotracer in a hydrotreating pilot plant: Upflow versus downflow operation
Authors: Burkhardt, T.1 thorsten.burkhardt@ifp.fr, Verstraete, J.1 jan.verstraete@ifp.fr, Galtier, P.1 pierre.galtier@ifp.fr, Kraume, M.2 vtsekr@ivtfg1.tu-berlin.de
Source: Chemical Engineering Science. Jun2002, Vol. 57 Issue 11, p1859. 8p.
Subjects: Radioactive tracers, Hydrotreating catalysts, Hydrodynamics
Abstract: The objective of the present work is to determine the influence of the two-phase flow direction in hydrotreating bench scale plants on the axial dispersion of the liquid phase. Residence time distribution experiments under ambient conditions in cocurrent upflow and in cocurrent downflow are carried out in a catalytic hydrotreating bench scale plant, which contains a thermowell. Particles that are representative of a commercial catalyst are used. The fluids and flow rates are chosen in order to simulate deep desulfurization conditions of a straight-run gas oil. In order to determine the axial dispersion only within the bed of particles, a radioactive tracer is used.The hydrodynamic parameters are identified using an axial dynamic piston dispersion model. The liquid axial dispersion is found to be significantly higher in the downflow mode than in the upflow mode. The values of the upflow liquid saturation are in a good agreement with the values found in the literature whereas the downflow liquid saturation is lower.Simulations with a multiphase model indicate that the difference of the axial dispersion might have a significant influence on the hydrodesulfurization performances. [Copyright &y& Elsevier]
Copyright of Chemical Engineering Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 7815358
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PubTypeId: academicJournal
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  Data: Residence time distributions with a radiotracer in a hydrotreating pilot plant: Upflow versus downflow operation
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  Data: <searchLink fieldCode="AR" term="%22Burkhardt%2C+T%2E%22">Burkhardt, T.</searchLink><relatesTo>1</relatesTo><i> thorsten.burkhardt@ifp.fr</i><br /><searchLink fieldCode="AR" term="%22Verstraete%2C+J%2E%22">Verstraete, J.</searchLink><relatesTo>1</relatesTo><i> jan.verstraete@ifp.fr</i><br /><searchLink fieldCode="AR" term="%22Galtier%2C+P%2E%22">Galtier, P.</searchLink><relatesTo>1</relatesTo><i> pierre.galtier@ifp.fr</i><br /><searchLink fieldCode="AR" term="%22Kraume%2C+M%2E%22">Kraume, M.</searchLink><relatesTo>2</relatesTo><i> vtsekr@ivtfg1.tu-berlin.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Chemical+Engineering+Science%22">Chemical Engineering Science</searchLink>. Jun2002, Vol. 57 Issue 11, p1859. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Radioactive+tracers%22">Radioactive tracers</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrotreating+catalysts%22">Hydrotreating catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrodynamics%22">Hydrodynamics</searchLink>
– Name: Abstract
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  Data: The objective of the present work is to determine the influence of the two-phase flow direction in hydrotreating bench scale plants on the axial dispersion of the liquid phase. Residence time distribution experiments under ambient conditions in cocurrent upflow and in cocurrent downflow are carried out in a catalytic hydrotreating bench scale plant, which contains a thermowell. Particles that are representative of a commercial catalyst are used. The fluids and flow rates are chosen in order to simulate deep desulfurization conditions of a straight-run gas oil. In order to determine the axial dispersion only within the bed of particles, a radioactive tracer is used.The hydrodynamic parameters are identified using an axial dynamic piston dispersion model. The liquid axial dispersion is found to be significantly higher in the downflow mode than in the upflow mode. The values of the upflow liquid saturation are in a good agreement with the values found in the literature whereas the downflow liquid saturation is lower.Simulations with a multiphase model indicate that the difference of the axial dispersion might have a significant influence on the hydrodesulfurization performances. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chemical Engineering Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/S0009-2509(02)00091-X
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 1859
    Subjects:
      – SubjectFull: Radioactive tracers
        Type: general
      – SubjectFull: Hydrotreating catalysts
        Type: general
      – SubjectFull: Hydrodynamics
        Type: general
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      – TitleFull: Residence time distributions with a radiotracer in a hydrotreating pilot plant: Upflow versus downflow operation
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            NameFull: Burkhardt, T.
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            NameFull: Verstraete, J.
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            NameFull: Galtier, P.
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            – D: 01
              M: 06
              Text: Jun2002
              Type: published
              Y: 2002
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