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本文测定了15℃(±0.01℃)时KCl-NaCl-MgCl_2-H_2O四元体系的溶解度数据,得出了完整的相图,补齐了现有文献所缺的溶解度数据.本文用从几个方向趋近的方法测定了共饱点数据,并用数理统计方法对数据进行了处理,结果可靠.用Pitzer方程式对该四元体系的溶解度数据进行了计算.计算所需的所有参数由所测的三元体系及部分四元体系数据用最小二乘法进行最优化,计算值与实验值吻合得很好.
In this paper, the solubility data of KCl-NaCl-MgCl_2-H_2O quaternary system at 15 ℃ (± 0.01 ℃) were measured and the complete phase diagram was obtained, which filled up the solubility data lacking in the existing literature.In this paper, The method of approach is used to measure the data of co-flooding and the data are processed by mathematical statistics with reliable results.The solubility data of the quaternary system are calculated by Pitzer’s equation.All the parameters required for the calculation are determined by the measured The ternary system and some quaternary system data were optimized by least square method. The calculated values agree well with the experimental data.