Maxwell-Stefan modeling of mass transfer in solvent impregnated resins
J Bokhove (External organisation)
PJAM Kerkhof (External organisation)
B Schuur (External organisation)
André de Haan (TU Delft - ChemE/Transport Phenomena)
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Abstract
Solventimpregnatedresinsarepromisingfortheremovalofpolarorganiccompoundsfromaqueous streams, buthavelowmass-transferrates.
Athoroughunderstandingofthephenomenaoccurringinside the oresofthesolventimpregnatedresinisthereforerequired.Inthisstudyamathematicalmodelwas
developed todescribethesimultaneousdiffusionandreaction.Thediffusionwasdescribedusingthe
Maxwell¿Stefanapproachtowardsmulti-componentdiffusionandincludedthevolume-expansionof
the organicphase.Themodelwasvalidatedusingexperimentaldatafromtheliteratureonthe
extractionofphenolbyCyanex923impregnatedinmacro-porouspolypropylene.Themodeldescribed
the experimentaldataasfunctionoftemperatureandinitialconcentrationaccuratelywithan R240.96
and aregressedreactionrateconstantwithaconfidence intervalof 76%. Analysisofthemodelresults
revealedthatmulti-componenteffectsasdescribedbytheMaxwell¿Stefanmodelwereoflimited
importance whereasthevolumeexpansionwasessentialtoaccuratelydescribetheexperimentaldata.
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