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Refractometry models for compositional analysis of binary and ternary mixtures
Dissertation (MEng (Chemical Engineering))--University of Pretoria, 2024.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2024
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| _version_ | 1867613509534089216 |
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| access_status_str | Open Access |
| author2 | Focke, Walter Wilhelm |
| author_browse | Focke, Walter Wilhelm |
| author_facet | Focke, Walter Wilhelm |
| collection | Thesis |
| dc_rights_str_mv | © 2023 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 (MEng (Chemical Engineering))--University of Pretoria, 2024. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/98046 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:16.787Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| 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:2263/98046 Refractometry models for compositional analysis of binary and ternary mixtures Focke, Walter Wilhelm u15076238@tuks.co.za Du Toit, Elizbé Pretorius, Franco UCTD Sustainable Development Goals (SDGs) Refractive index Polymer solution Phase equilibrium N-alkanes Mixing rules Dissertation (MEng (Chemical Engineering))--University of Pretoria, 2024. A review of existing compositional binary mixture models for refractive indices was undertaken and showed that they can be recast in forms that are linear in mole or volume fraction. Typically, mole fractions proved to be the better composition descriptor when analysing literature data and the molar refraction was shown to be virtually temperature independent. Depending on whether temperature, density or refractive index measurements of the mixture are available, different correlations were developed to predict the composition (as shown below). Furthermore, refractive index measurements on mixtures of n-alkanes with DEET were taken to determine phase equilibrium behaviour. With extrapolation to infinite molar mass, these alkanes approach polyethylene, which is the material from which DEET-containing mosquito-repellent devices were made. The results show that the microporous structure was likely formed by liquid-liquid phase separation. Lastly, it was shown that Padé approximants provide good representations of binary and ternary refractive index data. The temperature dependence of the pure components was elegantly subsumed in a pure component property, namely, the molar volume. Various constraints were applied to reduce the number of adjustable parameters even further and this proved to be successful. CSIR Chemical Engineering MEng (Chemical Engineering) Unrestricted Faculty of Engineering, Built Environment and Information Technology SDG-09: Industry, innovation and infrastructure 2024-09-05T10:16:47Z 2024-09-05T10:16:47Z 2024-09-02 2024-01-26 Dissertation Pretorius, F (2024) Refractometry models for compositional analysis of binary and ternary mixtures, Dissertation, Department of Chemical Engineering, University of Pretoria September 2024 (S2024) http://hdl.handle.net/2263/98046 Datasets not our own. Submitted with articles. en © 2023 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 | UCTD Sustainable Development Goals (SDGs) Refractive index Polymer solution Phase equilibrium N-alkanes Mixing rules Refractometry models for compositional analysis of binary and ternary mixtures |
| title | Refractometry models for compositional analysis of binary and ternary mixtures |
| title_full | Refractometry models for compositional analysis of binary and ternary mixtures |
| title_fullStr | Refractometry models for compositional analysis of binary and ternary mixtures |
| title_full_unstemmed | Refractometry models for compositional analysis of binary and ternary mixtures |
| title_short | Refractometry models for compositional analysis of binary and ternary mixtures |
| title_sort | refractometry models for compositional analysis of binary and ternary mixtures |
| topic | UCTD Sustainable Development Goals (SDGs) Refractive index Polymer solution Phase equilibrium N-alkanes Mixing rules |
| url | http://hdl.handle.net/2263/98046 |