The separation of ethanol-hexane mixtures by pervaporation

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dc.contributor.advisorSanderson, R. D.en_ZA
dc.contributor.authorFerreira, Juanitaen_ZA
dc.contributor.otherStellenbosch University. Faculty of Science. Dept. of Chemistry and Polymer Science.en_ZA
dc.date.accessioned2012-08-27T14:03:40Z
dc.date.available2012-08-27T14:03:40Z
dc.date.issued1900
dc.descriptionThesis (MSc)--Stellenbosch University, 1990.en_ZA
dc.description.abstractENGLISH ABSTRACT: Pervaporation experiments, using polyvinyl alcohol (PVA) and modified PVA membranes cast on permeable polyether sulfone substrates, were performed with ethanol-hexane mixtures. The modified PVA membranes comprised a specially synthesized and well defined series of poly(acrylic acid-co-vinyl alcohol-cohydroxyethyl- acrylate) terpolymers. Experimental variables were investigated. Variation of membrane thickness showed that at least two polymer layers were necessary. The effect of changing the binary feed ratio was that selectivity increased with increasing ethanol content. Pretreatment proved to be effective in terms of both flux and selectivity. Increasing hydrophilicity in the chemical structure of the membrane caused a decrease in the selectivity for ethanol, i.e. GFT-standard (3 300); GFT-wasserreich (270); Gantrez AN 119 (15); best synthesized terpolymer (2 200). These values were measured with a 5% ethanol mixture.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Pervaporasie-eksperimente, poli(viniel alkohol) (PVA) en gewysigde PVAmembrane gegiet op deurlaatbare poli-eter sulfoon substrate, is uitgevoer met etanol-heksaan-mengsels. Die gewysigde PVA-membrane behels 'n spesiaal gesintetiseerde en goed gedefinieerde reeks van poli(akrielsuur-ko-viniel alkoholko- hidroksietiel akrilaat) terpolimere. Eksperimentele veranderlikes is ondersoek. Die variasie van membraandikte het getoon dat twee lae polimere voldoende is. Die invloed van veranderinge in die binere voerverhouding was dat die selektiwiteit toeneem met 'n toenemende etanol-inhoud. Die voorbehandeling was effektief ten opsigte van die vloed en selektiwiteit. Toenemende hidrofilisiteit in die chemiese struktuur van die membraan het 'n afname veroorsaak in die selektiwiteit ten opsigte van etanol byvoorbeeld GFT Standard (3 300); GFT-wasserreich (270); Gantrez AN 119 (15); die beste gesintetiseerde polimeer (2 200). Die waardes is verkry deur gebruik te maak van 'n 5%-etanolmengsel.af_ZA
dc.format.extent105 leaves : illustrationsen_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/70062
dc.language.isoen_ZAen_ZA
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.rights.holderStellenbosch Universityen_ZA
dc.subjectMembrane separationen_ZA
dc.subjectSeparation (Technology)en_ZA
dc.subjectAzeotropesen_ZA
dc.subjectMixturesen_ZA
dc.subjectUCTDen_ZA
dc.titleThe separation of ethanol-hexane mixtures by pervaporationen_ZA
dc.typeThesis
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