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在Edwards通用性分子热力学模型的基础上,增加三元相互作用项,提出了组元间发生化学反应的弱电解质体系液固平衡热力学的数学模型.通过分析,得到了25C时NH_3—P_2O_5—H_2O三元系的固定参数,并赖以进行了体系内部的平衡计算,作出了体系中磷的分布曲线,所得结论对指导磷铵类肥料的生产有一定意义;通过对体系低浓度液固平衡进行预测,发现该模型的预测精度随搜索区间的缩小而显著提高.
On the basis of Edwards general molecular thermodynamic model, the ternary interaction term is added and a mathematical model of the liquid-solid equilibrium thermodynamics of weak electrolyte system with chemical reaction between the components is proposed. Through analysis, NH_3-P_2O_5-H_2O Ternary system fixed parameters and rely on the internal balance of the system to calculate the phosphorus distribution curve in the system, the conclusions obtained to guide the production of ammonium phosphate fertilizer has some significance; through the system of low concentration liquid-solid equilibrium It is found that the prediction accuracy of this model increases significantly with the reduction of search interval.