Liquid/solid mass transfer in an air-lift loop reactor with a dispersed solid phase

✍ Scribed by René H. Wijffels; Marleen Verheul; Wim A. Beverloo; Johannes Tramper

• Publisher: Wiley (John Wiley & Sons)
• Year: 1998
• Tongue: English
• Weight: 318 KB
• Volume: 71
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/(sici)1097-4660(199802)71:2<147::aid-jctb826>3.0.co;2-x

✦ Synopsis

In processes with immobilized cells mass transfer across the boundary layer surrounding the support often plays an important role. Relatively little is known about external mass transfer as a function of the superÐcial gas velocity in bioreactors such as air-lift loop reactors. In this work ion-exchange resins were used as a solid phase to determine the mass-transfer coefficient in such a reactor. Relations between the Sherwood number and the superÐcial gas velocity were derived and compared with relations from the literature. Relations in which the Sherwood number is a function of the energy-dissipation rate and relations in which the relative particle velocity is calculated from the rate of free fall of the particle were compared. It was shown that the Sherwood numbers that were functions of the energy-dissipation rates were higher than could be calculated on the basis of the rate of free fall. The Sherwood number obtained was used to calculate the of carrageenan gel beads as a solid phase in an air-lift loop k l, s reactor.

1998 SCI.