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Permanent link (DOI): https://doi.org/10.7939/R3B34H

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Characterization of Athabasca asphaltenes separated physically and chemically using small-angle X-ray scattering Open Access

Descriptions

Other title
Subject/Keyword
Small-angle X-ray scattering (SAXS)
Particle size distribution
Asphaltenes
Radius of gyration
Scattering coefficient
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Amundarain, Jesus
Supervisor and department
Shaw, John (Chemical and Materials Engineering)
Examining committee member and department
Fenniri, Hicham (Chemistry)
Shaw, John (Chemical and Materials Engineering)
Dechaine, Greg (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2010-09-29T15:24:31Z
Graduation date
2010-11
Degree
Master of Science
Degree level
Master's
Abstract
Athabasca asphaltenes were characterized using small-angle X-ray scattering (SAXS) with synchrotron radiation. Two methods were used to separate asphaltenes from Athabasca bitumen. Conventional chemical separation by precipitation with n-pentane, and physical separation realized by passing bitumen through a zirconia membrane with a 20 nm average pore size. The Athabasca permeates and chemically separated samples were dispersed in 1-methylnaphtalene and n-dodecane, with temperature and asphaltene concentration ranges of 50-310 °C and 1-8 wt. %, respectively. Two approaches were also taken in the analysis of the SAXS emissions. A model-independent approach provided radii of gyration and scattering coefficients. A model-dependent fit provided size distributions for asphaltenes aggregates assuming that they are dense and spherical. Physically and chemically separated asphaltenes showed significant differences in nominal size and structure, and their structural properties exhibited different temperature dependencies. The results challenge the merits of using chemically separated asphaltene properties as a basis for asphaltene property prediction in crude oil/bitumen.
Language
English
DOI
doi:10.7939/R3B34H
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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File format: pdf (Portable Document Format)
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File size: 3005391
Last modified: 2015:10:12 12:28:27-06:00
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File title: Microsoft Word - MSc thesis - J.AmundarainV1Sept 22.docx
File author: Jesus Amundarain
Page count: 92
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