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  • Study on mass transfer of isopropylbenzene and oxygen in a two-phase partitioning bioreactor in the presence of silicone oil.

Study on mass transfer of isopropylbenzene and oxygen in a two-phase partitioning bioreactor in the presence of silicone oil.

Applied biochemistry and biotechnology (2009-01-22)
Jean-Marc Aldric, Jean-Paul Lecomte, Philippe Thonart
ABSTRACT

A two-phase partitioning bioreactor to treat gas effluents polluted by volatile organic compound has been developed. In this work, both the mass transfer of isopropylbenzene (IPB) and oxygen have been considered in relation to their influence on the hydrodynamics of the reactor and the type of silicone oils used as a second phase. The synergistic effect of silicone oil and stirrer speed on the global oxygen mass transfer coefficient (KLa) and gas holdup (up to 12%) have been investigated. The addition of 10% of low viscosity silicone oil (10 cSt) in the reactor does not significantly affect the oxygen transfer rate. The very high solubility of IPB in the silicone oil leads to an enhancement of driving force term, especially for high fraction of silicone oil. However, it does not seem useful to exceed a volume fraction of 10% since KLa(IPB) decreases sharply at higher proportions of silicone oil. KLa(IPB) and KLaO2 evolve in the same way with the proportion of silicone oil. These results confirm the potentialities of our bioreactor to improve both the oxygen and pollutant gas transfer in the field of the treatment of gaseous pollutants, even for highly concentrated effluents.

MATERIALS
Product Number
Brand
Product Description

Supelco
Cumene, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
Silicone oil, viscosity 10 cSt (25 °C)
Supelco
Cumene solution, certified reference material, 5000 μg/mL in methanol
Sigma-Aldrich
Cumene, 98%
Sigma-Aldrich
Silicone oil, viscosity 5 cSt (25 °C)