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

Nurhayati, Mellon (2005) Hydrodynamic characteristics of gas-liquid co-current up-flow in a packed bed reactor. In: SOMCHE 2005.

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Abstract

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.

Item Type:Conference or Workshop Item (Paper)
Subjects:T Technology > TP Chemical technology
Departments / MOR / COE:Departments > Chemical Engineering
ID Code:6983
Deposited By: Mrs Nurhayati Mellon
Deposited On:08 Dec 2011 01:55
Last Modified:19 Jan 2017 08:27

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