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A ONE DIMENSIONAL MODEL FOR TRICKLE BED HYDRODESULFURIZATION

MOHAMMAD, NURHIDAYAH (2011) A ONE DIMENSIONAL MODEL FOR TRICKLE BED HYDRODESULFURIZATION. Masters thesis, UNIVERSITI TEKNOLOGI PETRONAS.

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Abstract

The need for processing of heavy sour crudes is increasing as good quality crude oil reserves are depleting fast. Presence of sulfur in the crude oil can corrode the process equipment, poison the catalysts and can lead to environmental pollution. Trickle bed reactors are widely used for hydrodesulfurization by reacting sulfur in the crude with hydrogen. Optimal design of these units is possible through development of easy to use performance models for trickle bed reactors recognizing the multiphase nature of the reactor and nonlinearities in the parameters. Liquid holdup in trickle bed reactors is an important hydrodynamic parameter which controls the liquid residence time in the bed and hence the degree of sulfur conversion. A new model to estimate liquid holdup in trickle beds is developed considering gas to flow around particles enveloped by trickling liquid. Ergun’s equation for gas phase pressure drop is modified incorporating the effect of presence of liquid phase on gas phase voidage and tortuosity for gas flow. The model is compared with large experimental database available in the literature to evaluate the effect of parameters such as gas and liquid velocities, liquid properties, particle shape and size, operating temperature and pressure. The model equations compare reasonably well with the experimental observations. A one-dimensional multiphase cells-in-series model is developed to predict the steady state behavior of trickle bed reactor applied to the hydrodesulfurization of vacuum gas oil (VGO). The reactor model is established through mass and enthalpy balances with reaction using carefully selected correlations and hydrodesulfurization reaction kinetics based on Langmuir-Hinshelwood mechanism from the literature. The model is validated with experimental data on hydrodesulfurization of VGO reported in the literature. The model is simulated to investigate the effect of various parameters to analyze ways and means to improve the sulfur reduction.

Item Type: Thesis (Masters)
Subject: UNSPECIFIED
Divisions: Engineering > Chemical
Depositing User: Users 5 not found.
Date Deposited: 05 Jun 2012 11:31
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/3055

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