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Permanent link (DOI): https://doi.org/10.7939/R3TD3K

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Aggregation and sedimentation of fine solids in non-aqueous media Open Access

Descriptions

Other title
Subject/Keyword
inter-particle force
silica
non-aqueous
sedimentation
colloid
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Fotovati, Maryam
Supervisor and department
Yeung, Anthony (Chemical and Materials Engineering)
Examining committee member and department
Leung, Juliana (Civil and Environmental Engineering)
Liu, Qi (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2011-04-15T18:11:30Z
Graduation date
2011-06
Degree
Master of Science
Degree level
Master's
Abstract
A major challenge to any “solvent-based” bitumen extraction technology is the removal of suspended fine solids from the hydrocarbon medium (i.e. diluted bitumen). To address this problem, we examined how colloidal solids could be made to aggregate in a hydrocarbon medium and thus be separated by gravity settling. The model solids were micron-sized “bitumen-treated” silica particles; the oil phase was bitumen diluted in an organic solvent of variable aromatic content. On the macroscopic scale, the experiments involved quantifying the settling rates of the particles as the aromatic content of the solvent was varied. Our results showed the existence of an optimal (non-zero) aromatic content at which the solids settling rate was the highest. On the microscopic scale, adhesive forces between individual glass spheres were directly measured using the microcantilever technique (again in non-aqueous media). It was demonstrated that, in addition to being captured by asphaltene networks, the suspended solids could also homo-flocculate — and thus form aggregates and be separated — in an alkane-diluted bitumen environment.
Language
English
DOI
doi:10.7939/R3TD3K
Rights
License granted by Maryam Fotovati (fotovati@ualberta.ca) on 2011-04-15T16:18:35Z (GMT): 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 the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein 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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