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Effect of surfactants on liquid side mass transfer coefficients: a new insight

Hebrard, Gilles and Zeng, Jikun and Loubiere, Karine Effect of surfactants on liquid side mass transfer coefficients: a new insight. (2009) Chemical Engineering Journal, vol. 1 (n° 1). pp. 132-138. ISSN 1385-8947

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Official URL: http://dx.doi.org/10.1016/j.cej.2008.08.027

Abstract

Specific experiments are proposed to investigate the effect of surfactants on liquid side mass transfer coefficients. They are based on the determination of the liquid side mass transfer coefficient kL at a free gas-liquid interface, under controlled temperature and hydrodynamic conditions. Firstly, the methodology is validated in water at various rotation speeds and temperatures. In a second time, it is applied in aqueous and pure solutions of anionic surfactants: a decrease of kL with an increase of surfactant concentrations is then observed until leveling off when the CMC is reached. Deduced from experimental results, the equivalent diffusion coefficients describe an identical behavior. These results demonstrate that the lowest kL are directly linked to the presence of surfactants at the gas-liquid interface which makes the diffusion coefficients of oxygen be reduced. At last, a comparison is performed with the data of [1-2] obtained from a chain of bubbles having diameters above to 3.5 mm. A quasi-linear relation between the kL issued from both hydrodynamic configurations is revealed in the whole range of surfactant concentrations. Such findings would prove that, in both cases, the impact of surfactants on liquid side mass transfer coefficient is correlated with the changes in the diffusion coefficients of oxygen

Item Type:Article
Additional Information:This publication is available at http://www.sciencedirect.com/science/journal/03009467
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université de Nantes (FRANCE)
Other partners > Ecole des Mines de Nantes (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA
Other partners > Ecole Nationale d'Ingénieurs des Techniques des Industries Agricoles et Alimentaires - ENITIAA (FRANCE)
Laboratory name:
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Deposited By:Karine LOUBIERE

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