| Summary: | 碩士 === 國立中央大學 === 環境工程研究所 === 91 === Abstract
In the past, investigators who devoted to study the evaporate behavior of organic compounds from water solution merely put emphasize on the organic compounds with relatively high volatility, for the organic compounds with relatively low volatility which seldom be illustrated. Additionally, the volatility rate of organic compounds can be dominated by their physical and chemical characteristics.
In this study thirteen organic compounds that can be classified for four types were selected and experiments were carried out, under different environmental conditions. (i.e., liquid stirring, gas mixing and surfactant or poly-benzene organic compounds addition to the solution.), The organic compounds be treated in batch experiment, for the purpose of evaporate behavior can be illustrated under different environmental coefficient conditions. Moreover, not only evaporate behavior can be described by three evaporate models (i.e., Mass Transfer Theory, Modified Knudsen Diffusion Equation, Reaction Rate Concept) but also the applicability and application of models can also be studied.
Under liquid/gas stirring system, the Henry’s constant was a significant factor for the mass transfer rate of organic compounds. Additionally, under the solution mixing with soluble organic compounds, the solubility of the organic compounds was a dominant factor. The mass transfer coefficients of organic compound with relatively high Henry’s constant tended to upward increase with an increasing in the intensity of liquid stirring, The transfer coefficient of the organic compounds with the relatively low Henry’s constant tended to downward increase. The difference results can be explained for the concentration gradient within gas/liquid interface. The mass transfer rate of the organic compounds in surfactant or poly-benzene dyes solution can be regarded as the function of soluble organic compounds concentration and solubility. Particularly in poly-benzene dyes solution, for the interactions of non-benzene compounds were not significant from benzene compounds, a decrease of the mass transfer rate in the latter was more prominent than that in the former. The experiment results presented that the mass transfer coefficients for different organic compounds that had similar physical and chemical properties were very closely. Of three evaporate models, Mass Transfer Theory is largely responsible for the organic compound with relatively high Henry’s constant, but hard to explain the influence of the evaporate behavior from aqueous characteristics completely. Modified Knudsen Diffusion Equation is largely responsible for the organic compound with relatively low Henry’s constant. Reaction Rate Concept merely was applied to account for the influence resulted from the different environmental conditions.
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