| Summary: | 碩士 === 長庚大學 === 化學工程研究所 === 87 === In this research, adsorption breakthrough characteristics of binary vocs system with methyl-ethyl-ketone(MEK) and toluene (TOL) on activated carbon are investigated. At first the isothermal adsorption curves and adsorption kinetic parameters of MEK and TOL in the single component system are determined. Using single-component isotherm equations, IAST, and the parameters of the binary adsorption system, breakthrough curves of the binary adsorption can be calculated by the used Nader Vahdat model. The predictability of the model is tested with a set of adsorption data in the binary system. The result shows that the sum of adsorption capacity of MEK and TOL for binary system is also lower than the sum of adsorption capacity of MEK and TOL in the single-component system. For breakthrough curve prediction, the weak adsorbate, MEK, is breakthrough early. According to the competition adsorption effect, adsorbed MEK on the activated carbon will be replaced by stronger adsorbate, TOL. Adsorbed MEK will desorb from the activated carbon and goes into stream. Therefore, outlet concentration of MEK will increase. To determine the adsorption equilibrium time, the concentration of TOL is more important factor than that of MEK. The more inlet concentration of TOL, the faster adsorption equilibrium of the system arrives. The predictions of start time and the maximum concentrations of the breakthrough curves by the model are well for the adsorption binary system. But the predictions for the breakthrough curves are poor. The parameters, adsorption capacities and k of TOL , in the binary system need to be corrected for this model.
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