Experimental and theoretical evidence for convective nutrient transport in an immobilized cell support

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Abstract

The authors studied the interaction between mass transfer and reaction kinetics in the anaerobic conversion of glucose to CO2 and ethanol by yeast immobilized in a porous rotating disk on the agitator shaft of a conventional CSTR. A Sherwood number correlation was used to show that external mass-transfer resistances were negligible under typical operating conditions. The modulus of Weisz based on observable reaction parameters was used to gauge the importance of pore diffusion limitations. Under conditions for which significant pore diffusion effects and hence low effectiveness factors (η = ca. 0.1) would be predicted, the observed reaction rates were much higher than expected (η = ca. 1), suggesting that pore diffusion limitations were at least partially relieved by convective transport of glucose into the support. Two possible mechanisms of convective transport are discussed.

Original languageEnglish (US)
Pages (from-to)205-209
Number of pages5
JournalBiotechnology Progress
Volume6
Issue number3
StatePublished - May 1990
Externally publishedYes

Profile

Immobilized Cells
Food
mass transfer
glucose
Glucose
agitators
immobilized cells
nutrient transport
reaction kinetics
gauges
ethanol
yeasts
Ethanol
Yeasts

ASJC Scopus subject areas

  • Food Science
  • Biotechnology
  • Microbiology

Cite this

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AB - The authors studied the interaction between mass transfer and reaction kinetics in the anaerobic conversion of glucose to CO2 and ethanol by yeast immobilized in a porous rotating disk on the agitator shaft of a conventional CSTR. A Sherwood number correlation was used to show that external mass-transfer resistances were negligible under typical operating conditions. The modulus of Weisz based on observable reaction parameters was used to gauge the importance of pore diffusion limitations. Under conditions for which significant pore diffusion effects and hence low effectiveness factors (η = ca. 0.1) would be predicted, the observed reaction rates were much higher than expected (η = ca. 1), suggesting that pore diffusion limitations were at least partially relieved by convective transport of glucose into the support. Two possible mechanisms of convective transport are discussed.

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