Abstract

JIMENEZ-GONZALEZ, A.; VARGAS-GARCIA, V.; LIZARDI-JIMENEZ, M.A  and  MEDINA-MORENO, S.A.. Evaluation of polyaromatic hydrocarbon and oxygen volumetric transfer coefficient on multi-phase system (liquid-liquid and liquid-liquid-gas): biocompatible solvent charge effect. Rev. Mex. Ing. Quím [online]. 2015, vol.14, n.3, pp.723-734. ISSN 1665-2738.

In this work were determined in a stirred tank system with the phases non-miscible silicon oil and heptamethylnonane, the mass transfer volumetric coefficient (K_La_H) of naphthalene and phenanthrene (liquid-liquid system). The K_La_H values were correlated with the Reynolds number, observing that K_La_H let of be a function of the Reynols for values N_Re ≥ 17,000. The values reached of K_La_H were 52 and 44 h^-1 for naphthalene and 69 and 62 h^-1 for phenanthrene both with silicon oil and heptamethylnonane respectively. Also was evaluated the volumetric charge effect of the non-miscible solvents, in the volumetric oxygen transfer coefficient (K_La) for the same stirred tank system with aeration (liquid-liquid-gas system). The addition of each one of the solvents led to strong decrease of the K_La, being more marked the effect with the increase in the volumetric charge of the solvents. The K_La in the aqueous medium without solvent decreased of a maximum of 49 h^-1 up to minimums of 22 h^-1 with oil silicon and 7 h^-1 with heptamethylnonane, in both cases with a volumetric charge of 5% of each solvent. The decrease in the K_La was probably due to a negative effect of the dynamic and kinematic viscosities of both solvents over: the oxygen diffusivity, thickness of the boundary layer and the specific interfacial area of the bubbles air.

Keywords : naphthalene; phenanthrene; volumetric mass transfer coefficients; silicone oil; heptamethylnonane.