Measurement of infinite dilution activity coefficients of selected environmentally important volatile organic compounds in polydimethylsiloxane using gas – liquid chromatography

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dc.contributor.author Muzenda, Edison
dc.contributor.author Belaid, M.
dc.contributor.author Ntuli, Freeman
dc.date.accessioned 2012-07-26T06:36:40Z
dc.date.available 2012-07-26T06:36:40Z
dc.date.issued 2010
dc.identifier.citation www.springerlink.com
dc.identifier.citation Muzenda, E., Belaid, M. and Ntuli, F. 2010. Measurement of infinite dilution activity coefficients of selected environmentally important volatile organic compounds in polydimethylsiloxane using gas - liquid chromatography.Korean Journal of Chemical Engineering, 27(5): 1509-1512. www.springerlink.com
dc.identifier.citation Muzenda, E., Belaid, M. and Ntuli, F. 2010. Measurement of infinite dilution activity coefficients of selected environmentally important volatile organic compounds in polydimethylsiloxane using gas - liquid chromatography.Korean Journal of Chemical Engineering, 27(5): 1509-1512. (The original publication is available at www.springerlink.com)
dc.identifier.uri http://hdl.handle.net/10210/5284
dc.description.abstract Silicon oil chemically known as polydimethylsiloxane (PDMS) is a high boiling point solvent highly suitable for volatile organic compounds (VOCs) absorption. In order to use PDMS as an absorption solvent for a specific waste gas problem, it is important to determine the infinite dilution activity coefficients of the VOCs to be separated with PDMS. This work reports activity coefficients at infinite dilution of 13 VOCs in polydimethysiloxane determined by the dynamic gas liquid chromatographic technique. The measurements were carried out at various temperatures (i.e, 303.15, 313.15, 323.15., 333.15, 353.15, 373.15, 393.15 and 423.15K). Four PDMS polymers with average molecular weight ranging from 760 to 13 000 were used as solvents. A control column packed by Perkin Elmer to our specifications was used to validate the coating and packing methods. Flow rate dependence of the elution peaks was also investigated by varying it from 10 – 50 ml/min. Precision was improved by reproducing the results using columns with different liquid loading, thus also studying the retention mechanism. The results compare well with the data from previous work using simple headspace and UNIFAC predictions and literature values. The successful comparison gives an indication of the GLC as a rapid, simple and accurate method for studying the thermodynamics of the interaction of a volatile solute with a non volatile solvent. en_US
dc.language.iso en en_US
dc.publisher Korean Journal of Chemical Engineering en_US
dc.rights Authors' pre-print version en_US
dc.subject Thermodynamics en_US
dc.subject Polydimethylsiloxane en_US
dc.subject Activity coefficients en_US
dc.subject Volatile organic compounds absorption en_US
dc.title Measurement of infinite dilution activity coefficients of selected environmentally important volatile organic compounds in polydimethylsiloxane using gas – liquid chromatography en_US
dc.type Article en_US

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