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The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study
Dissertation (MSc)--University of Pretoria, 2005.
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University of Pretoria
2013
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| _version_ | 1867613537228029952 |
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| access_status_str | Open Access |
| author2 | Nicol, Willie |
| author_browse | Nicol, Willie |
| author_facet | Nicol, Willie |
| collection | Thesis |
| dc_rights_str_mv | © 2003, 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, 2005. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/22864 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:37:43.241Z |
| 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:2263/22864 The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study Nicol, Willie elizbe.dutoit@up.ac.za Du Toit, Elizabeth Louisa Adsorption Mesityl oxide Modelling Kinetics Freundlich isotherm Acetone Rate inhibition Power law Cation exchange resins Catalysis UCTD Dissertation (MSc)--University of Pretoria, 2005. It is known that when water is a product in reactions catalysed by cation exchange resins, it inhibits the reaction rate much more than predicted by the reverse reaction or dilution effects. In this work the inhibiting effect is ascribed to the preferential association of the catalytically active sites with water. In the derivation of the kinetic model, a Freundlich type adsorption isotherm was used to quantify the number of sites occupied by water. This is combined with a power law expression for the reaction rate. The resultant expression can accurately predict the reaction rate for various initial concentrations of water and mesityl oxide. Even when water was initially added to the reaction mixture, this model still gave an absolute average error of 6.5% compared to a 54.6% error when the same approach was followed but with the more popular Langmuir isotherm to describe site deactivation. The kinetic expression previously proposed for this reaction system by Klein and Banchero also failed when water was added to the reaction mixture and gave an average error of 71.1%. The procedure used to derive the model is therefore suggested for all cation exchange catalysed reactions where water is one of the products. Chemical Engineering unrestricted 2013-09-06T13:51:04Z 2004-02-27 2013-09-06T13:51:04Z 2003-11-30 2005-02-27 2004-02-27 Dissertation Du Toit, E 2003, The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/22864 > http://hdl.handle.net/2263/22864 http://upetd.up.ac.za/thesis/available/etd-02272004-140347/ © 2003, 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 | Adsorption Mesityl oxide Modelling Kinetics Freundlich isotherm Acetone Rate inhibition Power law Cation exchange resins Catalysis UCTD The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study |
| title | The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study |
| title_full | The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study |
| title_fullStr | The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study |
| title_full_unstemmed | The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study |
| title_short | The rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins : formation of mesityl oxide from acetone as a case study |
| title_sort | rate inhibiting effect of water as a product on reactions catalysed by cation exchange resins formation of mesityl oxide from acetone as a case study |
| topic | Adsorption Mesityl oxide Modelling Kinetics Freundlich isotherm Acetone Rate inhibition Power law Cation exchange resins Catalysis UCTD |
| url | http://hdl.handle.net/2263/22864 http://upetd.up.ac.za/thesis/available/etd-02272004-140347/ |