• 作者： Shiah, I-Min; Tsai, Heng-Kuo; Tseng, Hsieng-Cheng
• 中文摘要： 本論文提出一計算方法,以預估鹽效應對醋酸水溶液汽液平衡之影響。本方法採用化學理論描述醋酸分子在汽相及液相中形成二聚體的結合效應,再利用Tan所提出之修正型液相活性係數模式,來考慮溶液中由於水-醋酸、水-鹽之交互作用所造成的非理想性。其中,溶劑-溶劑間的交互作用參數可藉由關聯醋酸水溶液的汽液平衡數據獲得; 而鹽-溶劑間的交互作用參數,則可由電解溶液蒸汽壓數據求得。本方法應用於五種含鹽的醋酸水溶液系統汽液平衡之計算,鹽濃度由零至完全飽和,預測結果與實驗數據相當吻合,其沸點的總平均偏差為0.86K,而汽相組成的總平均偏差則為0.76%。
• 英文摘要： A calculation method to predict the salt effects on the vapor-liquid equilibria of acetic acid aqueous solutions is proposed. In the developed method, the dimerization effects of acetic acid molecules in both liquid and vapor phases are described by chemical theory model explicitly, and the nonidealities caused by water-acetic acid and salt- water interactions in the liquid phase are considered by using modified activity coefficient model proposed by Tan. The solvent-solvent interaction parameters are obtained from the correlation to the salt-free VLE data, and the salt-solvent interaction parameters are determined from the vapor pressures of electrolyte solutions. The proposed method has been used to calculate the VLE of five salt- water-acetic acid systems for salt concentrations varying from zero to saturation. The predicted results are quite satisfactory with the overall absolute deviation of bubble point temperatures being 0.86K and that of vapor phase compositions being 0. 76%.
• 中文關鍵字： 偶合; 汽液平衡; 電解質; 水; 醋酸; 鹽效應
• 英文關鍵字： Dimerization; Vapor-Liquid Equilibrium; Electrolyte; Water; Acetic Acid; Salt Effect