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Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor

The residence time distribution (RTD) of a pilot plant scale packed bed reactor was studied in the present study using air – water system to investigate the effect of various gas/liquid ratio on the residence time distribution. The ranges of air – water velocity ratio is chosen to simulate the...

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Main Author: Nurhayati, Mellon
Format: Conference or Workshop Item
Published: 2005
Subjects:
TP Chemical technology
Online Access:http://eprints.utp.edu.my/6983/1/SOMChe_2005.pdf
http://eprints.utp.edu.my/6983/
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spelling my.utp.eprints.69832017-01-19T08:27:31Z Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor Nurhayati, Mellon TP Chemical technology The residence time distribution (RTD) of a pilot plant scale packed bed reactor was studied in the present study using air – water system to investigate the effect of various gas/liquid ratio on the residence time distribution. The ranges of air – water velocity ratio is chosen to simulate the hydrogen / oil ratio of typical bench scale hydro-processing units, noting the difference that might arise due to the different physical properties of the liquid. The experiments were conducted in an up-flow mode and the effect of gas / liquid velocities on the hydrodynamics of the reactor were investigated. This study is done using the tracer method – specifically the pulse input experiment. The packed bed reactor used in this study is packed with 8 x 8 mm Raschig rings. Results show that the increasing gas / liquid ratio increases the mean residence time and operating liquid hold-up. However, the value of Peclet number, which gives an indication to the degree of axial dispersion in the system, decreases, suggesting an increase in the degree of back-mixing in the reactor at higher gas flow rates. Second moment analysis of the reactor, namely the variance of the system, shows a reduction in value with decreasing gas / liquid ratio suggesting greater liquid distribution through the system at low gas flow rate. 2005 Conference or Workshop Item PeerReviewed application/pdf http://eprints.utp.edu.my/6983/1/SOMChe_2005.pdf Nurhayati, Mellon (2005) Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor. In: SOMCHE 2005. http://eprints.utp.edu.my/6983/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
topic TP Chemical technology
spellingShingle TP Chemical technology
Nurhayati, Mellon
Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor
description The residence time distribution (RTD) of a pilot plant scale packed bed reactor was studied in the present study using air – water system to investigate the effect of various gas/liquid ratio on the residence time distribution. The ranges of air – water velocity ratio is chosen to simulate the hydrogen / oil ratio of typical bench scale hydro-processing units, noting the difference that might arise due to the different physical properties of the liquid. The experiments were conducted in an up-flow mode and the effect of gas / liquid velocities on the hydrodynamics of the reactor were investigated. This study is done using the tracer method – specifically the pulse input experiment. The packed bed reactor used in this study is packed with 8 x 8 mm Raschig rings. Results show that the increasing gas / liquid ratio increases the mean residence time and operating liquid hold-up. However, the value of Peclet number, which gives an indication to the degree of axial dispersion in the system, decreases, suggesting an increase in the degree of back-mixing in the reactor at higher gas flow rates. Second moment analysis of the reactor, namely the variance of the system, shows a reduction in value with decreasing gas / liquid ratio suggesting greater liquid distribution through the system at low gas flow rate.
format Conference or Workshop Item
author Nurhayati, Mellon
author_facet Nurhayati, Mellon
author_sort Nurhayati, Mellon
title Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor
title_short Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor
title_full Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor
title_fullStr Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor
title_full_unstemmed Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor
title_sort hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor
publishDate 2005
url http://eprints.utp.edu.my/6983/1/SOMChe_2005.pdf
http://eprints.utp.edu.my/6983/
_version_ 1738655536040116224
score 13.211869

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