摘要
本研究主要量測無機鹽/有機溶劑/水之蒸汽壓數據。無機鹽為tetra-Ethylene glycol及di-Propylene glycol。無機鹽類濃度範圍為4 wt% ~ 25 wt%；有機溶劑濃度範圍為50 wt% ~ 80 wt%；溫度範圍為30~70℃。溶液之密度亦加以量測。 蒸汽壓的量測，採用靜態式測量設備。實驗量測之結果，以改良式Antoine equation熱力學模式，描述混合濃度蒸汽壓，濃度與溫度之關係；同時並以平均圓球近似法理論為基礎，其中混合溶劑部份以擬一溶劑之方法來關聯，以描述混合溶劑鹽類之蒸汽壓數據。 除濕溶液為將空氣中水氣之移除，其除濕能力可由溶液中蒸汽壓大小來決定。蒸汽壓壓降大小為空氣中水氣質傳至溶液中的驅動力，蒸氣壓降越大，除濕效率越佳。因此，溶液之蒸汽壓降為決定除濕性能之重要參數，文獻上已有許多除濕溶液蒸氣壓的報導，混合溶劑(無機鹽類/水/有機醇類)系統之蒸汽壓數據則較少報導。本研究之目的即為有系統量測(無機鹽類/水/有機醇類)系統之蒸汽壓數據，作為設計除濕設備上之基礎參考數據。
並列摘要
The vapor pressures of salt/organic solvent/water systems were measured at temperatures from 30 to 70℃ by a static method. The salts studied are LiCl, LiBr and CaCl2. The mixed-solvents are Diethylene glycol (DEG)/H2O, tetra-ethylene (glycol) TeEG/H2O and di-propylene glycol (DPG)/H2O. The corresponding densities of the solutions were also measured. The Antoine equation and Mean Spherical Approximation have been applied to correlate the measured data. In the Mean Spherical Approximation, the so-called “pseudo-solvent method” was applied to represent the mixed-solvent system. The parameters in Mean Spherical Approximation model were determined form the measured vapor pressure data. The densities of the solutions were also correlated by a simplified equation. Liquid desiccants have the property of absorbing moisture form air. When the vapor pressure of the inlet liquid desiccant is lower than that of the air stream, dehumidification takes place. The vapor pressure of the desiccants solution is rare in the open literature. Actually, the experimental data of the mixed solvents are very few in the literature. The propose of measure vapor pressure of salt/organic solvent/water. The results of this study can be used as a data base for designing the dehumidification system using salt-mixed solvents system as desiccants.