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The chemistry of the alkali-induces solubilisation of coal
Dissertation (MSc (Chemistry))--University of Pretoria, 2007.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613530369294336 |
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| access_status_str | Open Access |
| author2 | Morgan, D.L. |
| author_browse | Morgan, D.L. |
| author_facet | Morgan, D.L. |
| collection | Thesis |
| dc_rights_str_mv | © 2006, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Chemistry))--University of Pretoria, 2007. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/30555 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:37:36.798Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/30555 The chemistry of the alkali-induces solubilisation of coal Morgan, D.L. shokolay@webmail.co.za Shoko, Lay Alkali-induced Coal Solubilisation Chemistry UCTD Dissertation (MSc (Chemistry))--University of Pretoria, 2007. This thesis outlines a study carried out to understand the effects of coal dissolution variables. Several parameters that are thought to have a direct influence on the degree of coal dissolution in organic solvents were investigated by means of a series of experiments. The work done constitutes part of the research being carried out for the PBMR Company, whose aim is to synthesise nuclear-grade graphite from coal based materials. To enhance the efficiency of the process, it was necessary to gain a clear-cut understanding of the parameters that affect the process. The work carried in this project was divided into two sections. The first section involved the solubilisation of coal in polar aprotic organic solvents with the addition of a small amount of alkali. In this section as well, many parameters that influence the process were investigated. The second section involved the use of various analytical techniques to obtain information on the composition of coal extracts. The conclusions reached were as follows: <ul> <li>An alkali is required for the solubilisation of coal to occur in polar organic solvents. This also gives an overall high extraction percentage of ~ 92%. In pure dimethylformamide (DMF), the sodium hyroxide (NaOH) does not go into solution but on the addition of coal, the NaOH goes into solution.</li> The characteristic smell of the Refcoal solution confirms the presence of dimethylamine, although the titration results show otherwise. <ul> <li>The texture of the alkali used in the extraction affects the rate and degree of extraction. Finely ground alkali gives a faster dissolution rate, as well as a high extraction percentage.</li> <li>There is no hydrolysis of solvent during the extraction of coal.</li> <li>The concentration of the alkali used in the extraction process affects the degree to which coal can be extracted.</li> <li>The use of a strong alkali increases the rate at which coal can be dissolved in the solvent.</li> <li>Temperature does not affect the degree of extraction, as shown by the closeness of the extractions done at different temperatures. Also, external factors, such as oxidation and weathering of coal, have little effect on the extent of extraction.</li> <li>Coal characterization techniques provide information about the composition of coal extracts. The coals used in this process consisted of aliphatic and aromatic compounds. </li> Chemistry unrestricted 2013-09-07T19:20:18Z 2007-02-22 2013-09-07T19:20:18Z 2006-04-24 2007-02-22 2007-02-22 Dissertation Shoko, L 2006, The chemistry of the alkali-induces solubilisation of coal, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/30555 > http://hdl.handle.net/2263/30555 http://upetd.up.ac.za/thesis/available/etd-02222007-173845/ © 2006, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Alkali-induced Coal Solubilisation Chemistry UCTD The chemistry of the alkali-induces solubilisation of coal |
| title | The chemistry of the alkali-induces solubilisation of coal |
| title_full | The chemistry of the alkali-induces solubilisation of coal |
| title_fullStr | The chemistry of the alkali-induces solubilisation of coal |
| title_full_unstemmed | The chemistry of the alkali-induces solubilisation of coal |
| title_short | The chemistry of the alkali-induces solubilisation of coal |
| title_sort | chemistry of the alkali induces solubilisation of coal |
| topic | Alkali-induced Coal Solubilisation Chemistry UCTD |
| url | http://hdl.handle.net/2263/30555 http://upetd.up.ac.za/thesis/available/etd-02222007-173845/ |