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Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15
Dissertation (MEng (Chemical Engineering))--University of Pretoria, 2007.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613634354479104 |
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| access_status_str | Open Access |
| author2 | Du Toit, Elizabeth Louisa |
| author_browse | Du Toit, Elizabeth Louisa |
| author_facet | Du Toit, Elizabeth Louisa |
| collection | Thesis |
| dc_rights_str_mv | ©University of Pretoria 2006 Please cite as follows Schwarzer, R 2006, Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd- 05152007-112055/ > E456/ |
| description | Dissertation (MEng (Chemical Engineering))--University of Pretoria, 2007. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/24670 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:16.035Z |
| 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:2263/24670 Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15 Du Toit, Elizabeth Louisa upetd@ais.up.ac.za Nicol, Willie Schwarzer, Renier Bernhard Equilibrium constant Cation exchange resin Methyl acetate and kinetic modelling Sorption selectivity UCTD Dissertation (MEng (Chemical Engineering))--University of Pretoria, 2007. Reaction rate data at 50oC was generated in a batch reactor over a wide range of initial concentrations in the reaction mixture. In each case the reaction was allowed to reach equilibrium. Equilibrium conversion data clearly indicated that it is important to consider the non-ideality of the system. The NRTL activity model proved to be the most suitable model to calculate the activity based equilibrium constant, as the percentage standard deviation of the equilibrium constant calculated in this manner was only 7.6% for all the different experiments as opposed to 17.8% when the equilibrium constant was based on concentration. The NRTL parameters used were obtained from Gmehling&Onken (1977) who determined the parameters from vapour liquid equilibrium. The Langmuir-Hinshelwood kinetics proposed by Song et al. (1998) and Pöpken et al. (2000) provided an excellent representation of the reaction rate over a wide concentration range with an AARE of 6% and 5% respectively. It was shown that when the NRTL activities were used in the rate expression that a power law model provided a similarly accurate prediction of the reaction rate (AARE = 4.1%). When the Eley-Rideal reaction expression (in terms of the adsorption of methanol and water) was used, a slight improvement was achieved (AARE = 2.4%). As both the Langmuir-Hinshelwood and Eley-Rideal models require separate experiments for the measurement of adsorption constants, it seems that the activity based power law model should be the kinetic expression of choice. It can be concluded that a two parameter activity based rate expression predicts the reaction rate with similar accuracy as the multi-parameter adsorption models. This indicates that it is not necessary to know the concentration on the resin surface (adsorption models) or in the resin gel (absorption models) when describing the reaction rate as long as the bulk liquid phase activities can be adequately described. Chemical Engineering unrestricted 2013-09-06T18:07:59Z 2007-05-15 2013-09-06T18:07:59Z 2006-04-18 2007-05-15 2007-05-15 Dissertation 2006 Please cite as follows Schwarzer, R 2006, Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/24670 > E456/gm http://hdl.handle.net/2263/24670 http://upetd.up.ac.za/thesis/available/etd-05152007-112055/ ©University of Pretoria 2006 Please cite as follows Schwarzer, R 2006, Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd- 05152007-112055/ > E456/ application/pdf University of Pretoria |
| spellingShingle | Equilibrium constant Cation exchange resin Methyl acetate and kinetic modelling Sorption selectivity UCTD Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15 |
| title | Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15 |
| title_full | Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15 |
| title_fullStr | Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15 |
| title_full_unstemmed | Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15 |
| title_short | Esterification of acetic acid with methanol : a kinetic study on Amberlyst 15 |
| title_sort | esterification of acetic acid with methanol a kinetic study on amberlyst 15 |
| topic | Equilibrium constant Cation exchange resin Methyl acetate and kinetic modelling Sorption selectivity UCTD |
| url | http://hdl.handle.net/2263/24670 http://upetd.up.ac.za/thesis/available/etd-05152007-112055/ |