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Permanent link (DOI): https://doi.org/10.7939/R32W5B

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Thermal cracking of asphaltene by addition of hydrogen donor solvent Open Access

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Other title
Subject/Keyword
thermal cracking
asphaltene
hydrogen donor solvent
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Peng, Mingyang
Supervisor and department
Gray, Murray
Examining committee member and department
Zeng, Hongbo (Chemical engineering)
Thundat, Thomas (Chemical engineering)
Gray, Murray (Chemical engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2012-07-12T12:53:27Z
Graduation date
2012-11
Degree
Master of Science
Degree level
Master's
Abstract
Better definition of asphaltene structure is needed to develop new technology for upgrading, and to understand various bitumen properties. Analysis of asphaltene structure is hampered by aggregation of molecules at a length scale of 5 to 10 nm. At 300°C, the addition of aromatic solvents can partly, but not completely suppress aggregation of asphaltenes. This study will investigate a new method, thermal cracking combined with presoaking of a mixture of asphaltene and hydrogen donor solvent to suppress the aggregation and to maximize yield of cracked fragments. Asphaltene thermal cracking was carried out in micro batch reactor at 430°C by fluidized sand bath for 1 hour. Compared with non-solvent addition in thermal cracking, mixing of tetralin and tetrahydroquinoline with asphaltene greatly reduced the coke yield from 38% to 2%. To further enhance the solvent’s hydrogen transfer ability and the disaggregation of asphaltene, a presoaking stage at 200°C was performed prior to thermal cracking. In addition, parallel tests between tetralin and tetrahydroquinoline were conducted at different time periods ranging from 30 minutes up to 3 hours. Effects of nitrogen and oxygen reaction environment were also studied for the presoaking case to check for their effects. Compared with the case of direct solvent addition during thermal cracking, presoaking of either tetralin or tetrahydroquinoline with asphaltene did not show any significant reduction in coke yield for different presoaking periods, gas environment, or cooling interval.
Language
English
DOI
doi:10.7939/R32W5B
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.
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