Based on the assumption of Edwards et al (1975) of the molecular thermodynamics of aqueous weak electrolytes, a molecular thermodynamic correlation was established to calculate vapor liquid equilibria in NH3-H3PO4-H2O system.

• 根据Edwards提出的弱电解质溶液的分子热力学；基于质量平衡、化学平衡、电荷平衡及汽液平衡理论；提出了NH_3-H_3PO_4-H_2O体系汽液平衡计算的热力学模型.