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Modeling residue hydroprocessing in a multi-fixed-bed reactor system

Paper ID Volume ID Publish Year Pages File Format Full-Text
43234 45959 2008 11 PDF Available
Title
Modeling residue hydroprocessing in a multi-fixed-bed reactor system
Abstract

A three-phase heterogeneous plug-flow reactor model was developed to describe the behavior of residue hydroprocessing in a multi-fixed-bed reactor system. The model considers gas–liquid and liquid–solid mass-transfer phenomena and incorporates reactions such as hydrodesulfurization (HDS), hydrodenitrogenation (HDN), hydrodemetallization (HDM), hydrodeasphaltenization (HDAs) and hydrocracking (HCR) as well as hydrogen consumption. HDS reaction was described by Langmuir–Hinshelwood kinetics while the rest of the reactions were modeled with power law kinetics. To estimate kinetic parameters, experiments were carried out in a multi-reactor pilot plant loaded with a triple catalyst system under the following operating conditions: 380–420 °C temperature and 0.25–1.0 h−1 liquid hourly space velocity (LHSV), keeping constant hydrogen-to-oil (H2/oil) ratio at 891 std m3/m3 and pressure at 9.81 MPa. Model predictions showed good agreement with experimental data in the range of the studied operating conditions. The model was also applied for simulating an industrial scale residue hydroprocessing unit with multi-bed adiabatic reactors and hydrogen quenching.

Graphical abstractA three-phase heterogeneous plug-flow reactor model was developed to describe the behavior of residue hydroprocessing in a multi-fixed-bed reactor system. The model considers gas–liquid and liquid–solid mass-transfer phenomena and incorporates reactions such as hydrodesulfurization (HDS), hydrodenitrogenation (HDN), hydrodemetallization (HDM), hydrodeasphaltenization (HDAs) and hydrocracking (HCR) as well as hydrogen consumption. HDS reaction was described by Langmuir–Hinshelwood kinetics while the rest of the reactions were modeled with power law kinetics. To estimate kinetic parameters, experiments were carried out in a multi-reactor pilot plant loaded with a triple catalyst system under the following operating conditions: 380–420 °C temperature and 0.25–1.0 h−1 liquid hourly space velocity (LHSV), keeping constant hydrogen-to-oil (H2/oil) ratio at 891 std m3/m3 and pressure at 9.81 MPa. Model predictions showed good agreement with experimental data in the range of the studied operating conditions. The model was also applied for simulating an industrial scale residue hydroprocessing unit with multi-bed adiabatic reactors and hydrogen quenching. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Modeling; Residue hydroprocessing; Fixed-bed reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 351, Issue 2, 30 December 2008, Pages 148–158
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us