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Activity coefficients at infinite dilution for ILs : methyltrioctylammonium cation and bis(trifluoromethylsulfonyl)imide or thiosalicylate anions using glc

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dc.contributor.advisor Deenadayalu, Nirmala
dc.contributor.author Gwala, Nobuhle V.
dc.date.accessioned 2010-11-18T10:29:28Z
dc.date.available 2012-04-01T22:20:04Z
dc.date.issued 2009
dc.identifier.other 332074
dc.identifier.uri http://hdl.handle.net/10321/556
dc.description Dissertation submitted in fulfilment of the requirements for the Masters Degree in Technology: Chemistry, Durban University of Technology, 2009. en_US
dc.description.abstract The activity coefficients at infinite dilution ( γ13 ) were calculated for alkanes, alkenes, cycloalkanes, alkynes, ketones, alcohols and aromatic compounds from gas liquid chromatography (glc) measurements at three temperatures (303.15 and 313.15 and 323.15) K. The γ13 values were calculated from the retention data for two ionic liquids (ILs) with the same cation but different anions. The ionic liquids: [methyltrioctylammonium bis(trifluoromethylsulfonyl)imide and methyltrioctylammonium thiosalicylate] were used as the stationary phase. The γ13 data for methyltrioctylammonium thiosalicylate were higher than for methyltrioctylammonium bis(trifluoromethylsulfonyl)imide. For each temperature and each ionic liquid, γ13 values were determined for two columns and the average γ13 values were used for the calculation of the partial molar excess enthalpies at infinite dilution, H E 1 Δ , using the Gibbs-Helmholtz equation. Graphs of In γ13 vs 1/T were plotted to determine H E 1 Δ at T = 303.15 K. The selectivity, S12 , value for the hexane/benzene separation was calculated from the ratio of the avarage γ13 values to determine the suitability of the ILs as an entrainer for extractive distillation in the separation of aromatic and aliphatic compounds.The S12 values were also compared to the literature values for other ionic liquids. It was found that the longer chain alkyl group attached to the cation or anion gave lower S12 values. Both ILs have S12 values greater than one and in theory can be used as an entrainer for the hexane/ benzene separation. The capacities at infinite dilutions, k1 , were also calculated from the inverse of the avarage γ13 values for each IL at each temperature. en_US
dc.description.sponsorship National Research Fund; Postgraduate Development and Support Directorate. en_US
dc.format.extent 149 p en_US
dc.language.iso en en_US
dc.subject.lcsh Activity coefficients en_US
dc.subject.lcsh Ionic solutions en_US
dc.subject.lcsh Gas chromatography en_US
dc.subject.lcsh Separation (Technology) en_US
dc.title Activity coefficients at infinite dilution for ILs : methyltrioctylammonium cation and bis(trifluoromethylsulfonyl)imide or thiosalicylate anions using glc en_US
dc.type Thesis en_US
dc.dut-rims.pubnum DUT-000369


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