Doctoral Dissertations

Keywords and Phrases

Catalyst Utilization; Flow regime transition identification; Local gas and liquid sturation and velocities; Pressure drop and phase holdup; Trickle Bed Reactor; Trilobe and quadrilobe catalyst shapes


"The impacts of the packing characteristics on the hydrodynamics od a trickle bed reactor (TBR) have been investigated using advanced measurements techniques of Gamma-ray densitometry (GRD) and Optical fiber probe and conventional measurement techniques of high-frequency differential pressure transducer and load cell. Two different reactor sizes of bench and pilot plant scale were used. Bench-scale TBR carried out the experiments to assess phase distribution and catalyst utilization with 1.18 cm inside diameter and 72 cm length at ambient pressure and temperature. The mixture of catalyst and fine particles displayed considerable improvements in the phase distribution, liquid holdup profile, and catalyst utilization efficiency. In the pilot plant scale reactor, the catalyst shape showed a significant impact on the hydrodynamics, pressure drop, local gas and liquid velocities, and flow regime transition. The currently used trilobe and quadrilobe in hydrotreating processes showed lower pressure drop, increased liquid holdup, enhanced local gas and liquid saturation and velocities, and lower flow regime transition compared with spherical and cylindrical shapes of catalysts. Meanwhile, mechanistic model named slit model predicted the pressure drop and liquid holdup better than selected correlations where equivalent diameter is used and the bed characteristic is quantitated properly by measured Ergun constants"--Abstract, page iv.


Al-Dahhan, Muthanna H.

Committee Member(s)

Ludlow, Douglas K.
Liang, Xinhua
Park, Joontaek
Dogan, Fatih


Chemical and Biochemical Engineering

Degree Name

Ph. D. in Chemical Engineering


Missouri University of Science and Technology

Publication Date

Summer 2019

Journal article titles appearing in thesis/dissertation

  • Flow regimes identification of trickle bed reactor (TBR) packed with different shape of industrial using non-invasive gamma-ray densitometry (GRD)
  • Flow regimes identification of trickle bed reactor (TBR) packed with trilobe and quadrilobe industrial catalyst using non-invasive gamma-ray densitometry (GRD)
  • Effect of catalyst shape on pressure drop and overall liquid holdup in a pilot plant trickle bed reactor
  • Phase distribution investigations in a mimicked bench scale hydrotreater reactor using gamma-ray densitometry (GRD)
  • Non-invasive catalyst utilization measurement in a mimicked bench scale hydrotreater reactor
  • Local gas and liquid saturations and velocities study of various hydrotreating catalyst shapes using advanced optical fiber probe in a pilot plant trickle bed reactor


xvii, 197 pages

Note about bibliography

Includes bibliographic references.


© 2019 Mohammed Jaber Al-Ani, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11608

Electronic OCLC #