Simultaneous Determination of Multi-Component Isotherm Parameters from Single Sample of Liquid
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Simultaneous Determination of Multi-Component Isotherm Parameters from Single Sample of Liquid KOHEI SATOH∗ Research and Development Section, Organo Co. Ltd., Tokyo, Japan [email protected]
H. TED CHANG Special Products Division, Abbott Laboratories, North Chicago, USA HIDEO HATTORI AND KIYOHIKO TAJIMA Research & Development Section, Genesis Research Institute, Nagoya, Japan EIJI FURUYA Department of Industrial Chemistry, Meiji University, Kawasaki, Japan
Abstract. For the adsorption of multiple organic compounds using activated carbon in aqueous systems, several useful models have been developed to describe the equilibrium relationship. One of the easy-to-use models was developed by Suzuki et al. and the model was extended to determine equilibrium parameters for each component simultaneously. The determination procedure required liquid mixtures at various initial concentrations. The industrial sample, however, is normally controlled at constant concentration and hence the determination procedure mentioned above was limited to be applied. In this study, simultaneous determination procedure of multi-component isotherm parameters from single sample was discussed theoretically and experimentally. Then, it was found that Freundlichtype parameters for each component dissolved in water could be obtained from constant composition solutions based on Ideal Adsorbed Solution Theory. Keywords: multi-component, IAS theory, Freundlich equation, parameter determination
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Introduction
For the design of an adsorption process, kinetic and adsorptive equilibrium parameters are required. For the adsorption of multiple organic compounds using activated carbon in aqueous systems, several useful models have been developed to describe the equilibrium. Myers and Prausnits presented the Ideal Adsorbed Solution (IAS) theory for gaseous phase multi-component adsorption (Myers et al., 1965). Radke and Prausnitz later extended the IAS theory to dilute liquid solu∗ To
whom correspondence should be addressed.
tions (Radke et al., 1972). Suzuki applied Freundlich isotherm in IAS theory and developed easy-to-use equations for the estimation of multi-component equilibrium (Suzuki et al., 1983). Finally, Furuya extended Suzuki’s model and developed a technique to determine the isotherm parameters from multi-component aqueous samples (Furuya et al., 1986). In the previous laboratory study, Furuya et al. varied the initial concentration of adsorbates in a multicomponent system to determine the isotherm parameters. However, liquid samples from industrial processes normally only have a set of, if not fixed, concentrations for a given process stream. In other words,
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the composition of a process stream is normally controlled at a constant level for reproducibility. Furthermore, pure compounds are often not isolated and become available for the preparation of a varying composition. As a result, the previous study has limited application. In this study, a technique for the simultaneous determination of multi-component Freundlich
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