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Characterisation and modelling of transient transport through dense membranes using on-line mass spectrometry
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Orientador(es)
Resumo(s)
Abstract: This work presents a methodology for characterising solute transport through pervaporation membranes or, more generally, through dense membranes, in the whole transient regime. A real-time characterisation of transport through dense membrane is obtained by using on-line mass spectrometry (MS) monitoring, which allows to acquire the concentration of solutes in the permeate compartment with time intervals of 2 seconds (and lower if required). Time-dependent diffusion coefficients, D(t), were calculated for the whole operation period, including the initial transient period. Based on these values it is possible to infer about the relevance of solute-membrane interactions and rearrangement of the membrane structure due to the presence of permeant solutes. Finally, based on the information acquired, a mathematical model was developed in order to obtain solute concentration profiles inside the membrane and their evolvement along time.
Descrição
European KBBE FP7 project (262632)
PTDC/MAT109973/2009
Palavras-chave
POLYMERIC MEMBRANES GAS SEPARATIONS AROMA COMPOUNDS PERVAPORATION DIFFUSION PERMEATION SORPTION DEHYDRATION NANOFILTRATION RECOVERY Transient diffusion Time-dependent diffusion coefficients Mass spectrometry Pervaporation On-line monitoring