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本文测定了醇(甲醇、乙醇)—水—盐(CaCl_2、KCl)四体系常压下的汽液平衡实验数据。采用优先溶剂化模型进行关联。发现液相浓度(无盐基础,下同)一定时优先溶剂化数随盐浓度的递变规律。从而给出了关联式,以自由浓度偏差平方和为目标函数,在计算机上用非线性最小二乘法拟合出关联式中的最佳参数。所得四体系汽相摩尔分数计算值与实验值的平均误差最大1.87％最小0.33％。
In this paper, the experimental data of vapor-liquid equilibrium under normal pressure in alcohol (methanol, ethanol) -water-salt (CaCl_2, KCl) Preferential solvation models are used to correlate. Found that the liquid phase concentration (no salt basis, the same below) a certain priority when the number of solvation with the salt concentration of the law of change. The relational formula is given. Taking the square sum of the deviation of free concentration as the objective function, the best parameters in the correlation are fitted by the nonlinear least square method on the computer. The average error between calculated and experimental vapor phase molar fractions of the obtained four systems was 1.87% and 0.33% respectively.