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  Home > JCE Print > Journal of Chemical Education > Issues > 2008  > January  >
In the Laboratory
Tangential Ultrafiltration of Aqueous Saccharomyces cerevisiae Suspensions
Carlos M. Silva, Patrícia S. Neves, Francisco A. Da Silva, and Ana M. R. B. Xavier
Departamento de Química, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal

M. F. J. Eusébio
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Monte de Caparica, 2829-516 Caparica, Portugal

Cover
January 2008
Vol. 85 No. 1
p. 130
Abstract
Experimental work on ultrafiltration is presented to illustrate the practical and theoretical principles of this separation technique. The laboratory exercise comprises experiments with pure water and with aqueous Saccharomyces cerevisiae (from commercial Baker's yeast) suspensions. With this work students detect the characteristic phenomena involved (polarization and gel layer formation) and measure important process variables, such as, solvent permeance, gel layer concentration, limiting fluxes, and convective mass-transfer coefficient.
Supplement
A list with chemicals, materials, and equipment used; the detailed experimental procedure; the sequence of calculations that students carry out; some tips and warnings for instructors; and a calibration curve of optical density to determine the concentration of Saccharomyces cerevisiae suspensions are available.
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Contents
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JCE2008p0130W.doc (Microsoft Word)
More Information
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Citation
Silva, Carlos M.; Neves, Patrícia S.; Eusébio, M. F. J.; Da Silva, Francisco A.; Xavier, Ana M.R.B. J. Chem. Educ. 2008, 85, 130.
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Keywords
Chemical Engineering; Hands-On Learning / Manipulatives; Laboratory Equipment / Apparatus; Laboratory Instruction; Membranes; Separation Science; Transport Properties; Upper-Division Undergraduate
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History
Created:
Last Updated:
12/4/2007
12/12/2007
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