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Study of the early stages of carbonisation of some pitch materials of different composition
Dissertation (MSc)--University of Pretoria, 2009.
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University of Pretoria
2013
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| _version_ | 1867613731651846144 |
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| access_status_str | Open Access |
| author2 | Rand, Brian |
| author_browse | Rand, Brian |
| author_facet | Rand, Brian |
| collection | Thesis |
| dc_rights_str_mv | © 2009, 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)--University of Pretoria, 2009. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/29920 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:40:48.647Z |
| 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:2263/29920 Study of the early stages of carbonisation of some pitch materials of different composition Rand, Brian Focke, Walter Wilhelm Manabile, Segaule Isaac Heat treatment Chemical composition Mesophase Pitch Green coke UCTD Dissertation (MSc)--University of Pretoria, 2009. The formation and development of mesophase from different pitches under carbonisation conditions was investigated. Members of the pyrolysis series were prepared from four pitches. A temperature range between 380 and 500°C was used to follow mesophase development for each pitch. As-received pitches and their green cokes were characterised by thermomechanical analysis (glass transition temperature and softening point temperature), elemental analysis, Fourier transform infrared spectroscopy, thermogravimetry or differential thermogravimetry, and optical microscopy (mesophase content). Additional data about the evolution of different volatile products and about possible chemical reactions occurring during thermal decomposition were obtained from thermogravimetric mass spectrometric analysis. The effect of heating rate on the behaviour and carbon yield was also studied. The results showed that the two anthracene oil pitches do not develop mesophase, whereas the medium-temperature and high-temperature pitches do. However, their textures are completely different. The medium-temperature pitch shows an improvement in texture from the mosaic to the coarse domain at 500°C, whereas the high-temperature pitch shows flow domains. It was further shown that the process of preparing mesophase, i.e. the heat-treatment process, increases the aromaticity and carbon yield. Thermogravimetric mass spectrometric analysis showed that the dominant reaction for all the pitches is the condensation reaction, which is accompanied by the evolution of H2 and CO. The heating rate affects the behaviour of the pyrolysing pitches in that a lower heating rate lowers the carbon yield. This study gave insight into the influence of the nature and composition of the precursor on the formation of mesophase. Chemistry unrestricted 2013-09-07T17:16:23Z 2009-12-08 2013-09-07T17:16:23Z 2009-09-02 2009-12-08 2009-11-29 Dissertation Manabile, SI 2009, Study of the early stages of carbonisation of some pitch materials of different composition, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/29920 > E1495/ag http://hdl.handle.net/2263/29920 http://upetd.up.ac.za/thesis/available/etd-11292009-204923/ © 2009, 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 | Heat treatment Chemical composition Mesophase Pitch Green coke UCTD Study of the early stages of carbonisation of some pitch materials of different composition |
| title | Study of the early stages of carbonisation of some pitch materials of different composition |
| title_full | Study of the early stages of carbonisation of some pitch materials of different composition |
| title_fullStr | Study of the early stages of carbonisation of some pitch materials of different composition |
| title_full_unstemmed | Study of the early stages of carbonisation of some pitch materials of different composition |
| title_short | Study of the early stages of carbonisation of some pitch materials of different composition |
| title_sort | study of the early stages of carbonisation of some pitch materials of different composition |
| topic | Heat treatment Chemical composition Mesophase Pitch Green coke UCTD |
| url | http://hdl.handle.net/2263/29920 http://upetd.up.ac.za/thesis/available/etd-11292009-204923/ |