TY - JOUR
T1 - On-line and real-time monitoring of organophilic pervaporation by mass spectrometry
AU - Brazinha, Carla
AU - Fonseca, A. P.
AU - Teodoro, O. M. N. D.
AU - Crespo, João G.
N1 - Carla Brazinha also acknowledges the Fundacao para a Ciencia e a Tecnologia (Portugal) for the PhD grant number SFRH/BD/12476/2003.
PY - 2010/2/1
Y1 - 2010/2/1
N2 - This work demonstrates experimentally the use of mass spectrometry (MS) for on-line, quantitative monitoring of organophilic pervaporation processes operated not only under variable conditions of temperature of condensation/downstream pressure but also when using complex multi-component feed streams. Due to its high sensitivity, mass spectrometry is particularly suitable for on-line monitoring of aromas in dilute streams under reduced pressure, as happens with natural aromas in permeate streams. Mass spectrometry is also suitable for on-line monitoring of solvent and co-solvent permeants (water and ethanol in the selected case study), enabling for on-line determination of selectivity of the solutes of interest. A new method of calibration is proposed and validated, which correlates the intensity of the characteristic mass peak mi/z for each compound of interest with its partial pressure in the permeate stream. Moreover, mass spectrometry proves to be a powerful tool for studying the fractionation of aromas, recovered by integrated pervaporation-condensation processes, allowing on-line monitoring of each solute vapour in the permeate stream. Additionally, this technique enables for accurate transient studies due to the possibility of acquiring one data point every 12-15 s (potentially less, if desired) in real-time.
AB - This work demonstrates experimentally the use of mass spectrometry (MS) for on-line, quantitative monitoring of organophilic pervaporation processes operated not only under variable conditions of temperature of condensation/downstream pressure but also when using complex multi-component feed streams. Due to its high sensitivity, mass spectrometry is particularly suitable for on-line monitoring of aromas in dilute streams under reduced pressure, as happens with natural aromas in permeate streams. Mass spectrometry is also suitable for on-line monitoring of solvent and co-solvent permeants (water and ethanol in the selected case study), enabling for on-line determination of selectivity of the solutes of interest. A new method of calibration is proposed and validated, which correlates the intensity of the characteristic mass peak mi/z for each compound of interest with its partial pressure in the permeate stream. Moreover, mass spectrometry proves to be a powerful tool for studying the fractionation of aromas, recovered by integrated pervaporation-condensation processes, allowing on-line monitoring of each solute vapour in the permeate stream. Additionally, this technique enables for accurate transient studies due to the possibility of acquiring one data point every 12-15 s (potentially less, if desired) in real-time.
KW - Aroma/flavour recovery
KW - Bioethanol
KW - Fractionated condensation
KW - On-line mass spectrometry
KW - Organophilic pervaporation
KW - Real-time monitoring
UR - http://www.scopus.com/inward/record.url?scp=71449123299&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2009.10.009
DO - 10.1016/j.memsci.2009.10.009
M3 - Article
AN - SCOPUS:71449123299
VL - 347
SP - 83
EP - 92
JO - Journal of Membrane Science
JF - Journal of Membrane Science
SN - 0376-7388
IS - 1-2
ER -