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Permanent link (DOI): https://doi.org/10.7939/R3ST7F390

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Pyrolysis of asphaltenes in an atmospheric entrained flow reactor: A study on gasification reactivity and properties of chars Open Access

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Other title
Subject/Keyword
Asphaltenes
DTF
Gasification
Char
Pyrolysis
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Mahapatra, Nirlipt
Supervisor and department
Gupta, Rajender (Chemical and Materials Engineering)
Examining committee member and department
Li, Leijun (Chemical and Materials Engineering)
Prasad, Vinay (Chemical and Materials Engineering)
Soares, Joao (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2014-09-18T10:20:06Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
Solvent deasphalting, followed by asphaltenes gasification, has been recommended as a favorable alternative to coker based upgrading processes. However, very limited work has been carried out on pyrolysis and gasification of asphaltenes, at entrained flow conditions. The present work aims at addressing this gap. Chars were prepared in an atmospheric entrained flow reactor, at different process conditions. Several characterization techniques viz. SEM, EDX, XRD, FTIR, ICP-MS, TGA etc. were used to identify the changes in morphology, structure and properties of chars. Individual char particles were observed as having hollow structures, with porous walls. Effect of pyrolysis temperature, was observed to be much more prominent, than the effect of residence time (between 5-12s). Global gasification reactivity of different chars, was compared at a fixed temperature and concentration of CO2 and steam. Chars obtained at higher temperatures exhibited lower H/C ratio, and had lower content of heteroatoms. Graphitization of chars was observed at higher temperatures. Consequently, chars obtained at higher operating temperatures, demonstrated lower gasification reactivity. Vanadium and nickel present in asphaltenes, accumulated in chars. Kinetic parameters for pyrolysis, and heterogeneous char steam/CO2 reactions were estimated. Gasification reactions were observed, to be 5-6 orders of magnitude, slower than pyrolysis reactions. Temperature, velocity profile and residence time for particles in the DTF were also estimated by mathematical models (COMSOL Multiphysics).
Language
English
DOI
doi:10.7939/R3ST7F390
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Some parts of this thesis, primarily from Chapters 3, 4, and 5 have been submitted to the journal Fuel as N. Mahapatra, V. Kurian, B. Wang, F. Martens and R. Gupta, “Pyrolysis of asphaltenes in an atmospheric entrained flow reactor: A study on char characterization” .

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