Gonca SAĞLAM, Zeynep AKTOSUN, Gülşah ÖZÇELİK, Ahmet RIFAT ÖZDURAL

Determination of mass transfer coefficients of 10B and 11B isotopes on chelating and weak base anion exchange resins

The successful design and the operation of chromatographic separations require the optimization of a large number of parameters which affect the separation in a usually nonlinear and interacting fashion. Additionally, modeling studies of chromatographic separations allow prediction of the dynamic behavior of the solute in the column against different operating alternatives without experimental effort, as well as scaling up the separation process. Thus the model based understanding of chromatographic separation, largely prevents the inconveniences of experimenting with the real process whether the operation is batch or continuous. There are several models to be used for chromatographic separations whether it is at the analytical scale or at the preparative/production scale, including the ideal model, the equilibrium dispersive model, the transport dispersive model and the general rate (GR) model. The GR model is widely acknowledged as being the most comprehensive among the chromatography models available in the literature as it accounts for axial dispersion and all the mass transfer resistances, e.g. external mass transfer of solute molecules from bulk phase to the external surface of the adsorbent, diffusion of the solute molecules through the particle, and adsorptiondesorption processes on the site of the particles. In this study the mass transfer coefficients of 10B and 11B isotopes are determined for chelating resin of different particle diameter and weak base anion exchange resin. It is concluded that film mass transfer coefficient and homogeneous solid diffusivity coefficients differs from each other both for 10B and 11B isotopes according to resin type and diameter

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