Effect of convective mass transfer on beer diafiltration

The industrial application of dialysis for the de‐alcoholization of beer is based on a diafiltration method, because a small positive transmembrane pressure on the beer side of the membrane is necessary to prevent ingress of water by osmosis and resulting dilution of the beer. This pressure differen...

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Bibliographic Details
Published in:Journal of the Institute of Brewing 1997-09, Vol.103 (5), p.279-282
Main Authors: Leskosek, I, Nedovic, V, Petkovska , M
Format: Article
Language:English
Subjects:
beer
Beers
Biological and medical sciences
convection
Cupro-Phane
cuprophane
de-alcoholization
Diafiltration
dialysis
diffusion
extraction
Fermented food industries
filtration
Food industries
Fundamental and applied biological sciences. Psychology
mass transfer
membranes
non-alcoholic beers
polysulfone
separation
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Summary:The industrial application of dialysis for the de‐alcoholization of beer is based on a diafiltration method, because a small positive transmembrane pressure on the beer side of the membrane is necessary to prevent ingress of water by osmosis and resulting dilution of the beer. This pressure difference introduces the new driving and convective mass transfer mechanism, which takes place simultaneously with the diffusive mechanism (specific for dialysis). The question is the influence which it has on the overall mass transfer phenomenon and selectivity of the alcohol/extract separation. An experimental investigation of beer diafiltration using two different membranes (cellulose based Cuprophane and polysulfone) was performed at different transmembrane pressure differences and flow rates. On the basis of the experimentally measured inlet and outlet concentrations the convective components of the alcohol and extract mass fluxes as well as the overall separation factor were determined. This data was analysed and compared. The results indicate that convective mass transfer stimulated extract transfer and losses and thus diminished the efficiency of selective alcohol/extract separation in beer dialysis.
ISSN:0046-9750
2050-0416
DOI:10.1002/j.2050-0416.1997.tb00956.x