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Mathematical modeling and parametric study of a dehydrogenation catalyst decoking process

Paper ID Volume ID Publish Year Pages File Format Full-Text
39414 45822 2015 9 PDF Available
Title
Mathematical modeling and parametric study of a dehydrogenation catalyst decoking process
Abstract

•A kinetic model for decoking reaction of dehydrogenation catalyst is developed.•A two-stage dynamic heterogeneous model is developed for regeneration process.•Controlling the O2 concentration is the best strategy to prevent the catalyst sintering.•The constant inlet O2 concentration of 5.5% reduces the regeneration duration by about 4 h.

The present study provides a dynamic mathematical model for a regeneration process of coked catalysts in a multi-tube fixed-bed reactor. Mass and energy conservation laws are applied to predict the temperature variation of gas and solid phases along the reactor length in two main stages: heating and coke burning. The kinetics of decoking is obtained by fitting the data taken from a pilot-scale reactor. The model results are compared with the experimental data taken from both a pilot-scale and a commercial-scale plant. The effect of operating parameters, including inlet gas flow rate, temperature, and composition on the reactor performance is studied. Controlling the O2 concentration is the best strategy to prevent the catalyst sintering. In order to reduce the regeneration process duration, two strategies are examined: constant and stepwise rising trend of inlet O2 concentration. Using the inlet O2 molar-fraction of 5.5% reduces the regeneration duration by about 4 h.

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Keywords
Mathematical modeling; Regeneration; Coke burning; Fixed-bed reactor; Kinetics
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Mathematical modeling and parametric study of a dehydrogenation catalyst decoking process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 489, January 2015, Pages 226–234
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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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