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NAMS 2002 Workshop - ICOM 2008

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Membrane and Surface Modification II – 2<br />

Thursday July 17, 3:00 PM-3:30 PM, O’ahu/Waialua<br />

Surface Modification of Pervaporation Membrane by UV-Radiation and<br />

Application of Shear Stress<br />

P. Izák (Speaker), Institute of Chemical Process Fundamentals, Prague, Czech Republic -<br />

izak@icpf.cas.cz<br />

H. Godinho, Universidade Nova de Lisboa, Portugal<br />

P. Brogueira, Instituto Superior Técnico, Portugal<br />

L. Figueirinhas, Instituto Superior Técnico, Portugal<br />

J. Crespo, Universidade Nova de Lisboa, Portugal<br />

At present, one of the main challenges in green chemistry is the selective<br />

recovery of solutes from ionic liquids by clean membrane processing. Serious<br />

problems are caused by concentration polarization, in particular during<br />

pervaporation process, especially when green solvents with high viscosity (such<br />

as ionic liquids) are used. Therefore we looked for ways to promote external<br />

mass transfer in the binary mixture and thus minimize the concentration<br />

polarization at the membrane surface. The surface modification of the<br />

polyurethane (PU) and polybutadiene-diol (PBDO) membrane obtained by UVradiation<br />

and application of shear stress allowed us to increase external mixing of<br />

the liquid feed at the membrane surface. The formed microstructures increased<br />

the enrichment factor and also permeation flux of solute. Additionally, when we<br />

increased feed flow rate in pervaporation module we also improved the<br />

pervaporation characteristics. This work demonstrates the potential of surface<br />

modified dense membranes to enhance the pervaporation separation processes.<br />

Acknowledgements<br />

This research was supported by the post-doc grant (SFRH/BPD/9470/<strong>2002</strong>) and the projects<br />

grants (POCTI/EQU/35437/2000 and POCTI/CTM/56382/2004) from Fundação para a Ciência e<br />

a Tecnologia, Portugal, and to the Czech Science Foundation for grant No. 104/08/0600.

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