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Permanent link (DOI): https://doi.org/10.7939/R3GQ6R82C

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Coal Liquefaction Liquid Quality: Influence of Temperature and Heating Approach on Solvent Extraction of Coal Open Access

Descriptions

Other title
Subject/Keyword
stages
quality
sulfur
liquefaction
temperature
yield
heating approach
coal
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Apan, Ioan-Tudor
Supervisor and department
De Klerk, Arno (Chemical and Materials Engineering)
Examining committee member and department
Liu, Qingxia (Chemical and Materials Engineering)
De Klerk, Arno (Chemical and Materials Engineering)
Gupta, Rajender (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2014-09-22T14:15:37Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
This project evaluated the impact of reaction temperature and of additional heating steps on the quality of the liquids obtained from solvent extraction of a lignite coal with tetralin. The points of focus were the coal liquid yield, physical properties, aromatic content and iron pyrite conversion. All experiments were carried out in micro-batch reactors, nitrogen atmosphere and autogenous pressure, with a coal to solvent ratio of 1:3. First, the influence of extraction temperature was investigated by performing extraction at different temperatures in the range 340 to 415 ⁰C, for 1 h. The second part of the project involved 9 different heating scenarios combining a low temperature step in the range 100 to 200 ⁰C followed by a high temperature step in the range 350 to 415 ⁰C. It was found that performing liquefaction at lower temperatures is beneficial in terms of coal liquid density, aromatic content and iron pyrite conversion, while higher temperatures favor a better yield, lower coal liquid boiling points and the formation of aromatics with higher aliphatic hydrogen content. Adding an additional low temperature step led to higher liquid yields, lower coal liquid boiling points and higher aliphatic hydrogen content of the aromatics contained in the coal liquids, while the coal liquid density remained predominantly unchanged.
Language
English
DOI
doi:10.7939/R3GQ6R82C
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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