CHARACTERISATION OF ASYMMETRIC ALUMINA HOLLOW FIBRE MEMBRANES

CHARACTERISATION OF ASYMMETRIC ALUMINA HOLLOW FIBRE MEMBRANES

LEMOS, C. O. T.; SILVA, F. B. da; REIS, M. H. M.; GIL, A. M. G.; LI, K.

Artigo:

Ceramic membranes are widely used for separations. They can be configured as flat discs, finite tubes or hollow fibres. Hollow fibres present some advantages such as the higher ratio between membrane and system areas. Moreover, the asymmetric structure, presenting regions of different pore sizes, should be carefully prepared in order to achieve greater permeabilities. Here we analyze the permeability and the morphology of asymmetric alumina hollow fibres which were prepared at different conditions. The hollow fibres were fabricated using the phase inversion/sintering method. Different internal coagulants and sintering temperatures were applied. The hollow fibres were characterised by scanning electronic microscopy, water and nitrogen permeations and mechanical strength. The obtained results showed that more fingers are obtained when solvent mixed with water is used as internal coagulant, instead of pure water. As consequence, these membranes presented greater permeabilities. The permeability also increased with the decrease in the sintering temperature. However, the decrease in the sintering temperature decreased the mechanical strength of the fibre. In conclusion, more permeable asymmetric hollow fibres were obtained using solvent as internal coagulant and applying lower sintering

Ceramic membranes are widely used for separations. They can be configured as flat discs, finite tubes or hollow fibres. Hollow fibres present some advantages such as the higher ratio between membrane and system areas. Moreover, the asymmetric structure, presenting regions of different pore sizes, should be carefully prepared in order to achieve greater permeabilities. Here we analyze the permeability and the morphology of asymmetric alumina hollow fibres which were prepared at different conditions. The hollow fibres were fabricated using the phase inversion/sintering method. Different internal coagulants and sintering temperatures were applied. The hollow fibres were characterised by scanning electronic microscopy, water and nitrogen permeations and mechanical strength. The obtained results showed that more fingers are obtained when solvent mixed with water is used as internal coagulant, instead of pure water. As consequence, these membranes presented greater permeabilities. The permeability also increased with the decrease in the sintering temperature. However, the decrease in the sintering temperature decreased the mechanical strength of the fibre. In conclusion, more permeable asymmetric hollow fibres were obtained using solvent as internal coagulant and applying lower sintering

Palavras-chave:

DOI: 10.5151/chemeng-cobeq2014-0669-24512-156188

Referências bibliográficas

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Como citar:

LEMOS, C. O. T.; SILVA, F. B. da; REIS, M. H. M.; GIL, A. M. G.; LI, K.; "CHARACTERISATION OF ASYMMETRIC ALUMINA HOLLOW FIBRE MEMBRANES", p-15139-15146. In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2]. São Paulo: Blucher, 2015.
ISSN 23591757, DOI 10.5151/chemeng-cobeq2014-0669-24512-156188