Thermodynamic Equilibria Calculation of NH_3-H_3PO_4-H_2O System

李仲英

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Thermodynamic Equilibria Calculation of NH_3-H_3PO_4-H_2O System

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- Thermodynamic Equilibria Calculation of NH_3-H_3PO_4-H_2O System
- CIESC Journal Issue 2, (1989)
- 作者机构：
  
  湖南大学环保研究所,长沙
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 April 1989，
  
  Published：25 April 1989
- 稿件说明：
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李仲英. Thermodynamic Equilibria Calculation of NH_3-H_3PO_4-H_2O System[J]. CIESC Journal, 1989, (2).
DOI：

李仲英. Thermodynamic Equilibria Calculation of NH_3-H_3PO_4-H_2O System[J]. CIESC Journal, 1989, (2). DOI：

摘要

采用静态法测定了NH_3-H_3PO_4-H_2O体系在NH_3/H_3PO_4分子比为1.0-1.4

相应温度范围为75-175℃时的汽液平衡数据

并把实验数据关联成数学式.根据热力学理论

对NH_3-H_3PO_4-H_2O体系的热力学平衡计算的模型作了初步探讨.液相活度及活度系数采用扩充Pitzer方程

汽相逸度系数采用根据极性修改的RK方程.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.计算结果表明:摩尔浓度低于25mol/kg H_2O时

模型计算结果与实验数据吻合得较好.

Abstract

A thermodynamic model of vapor-liquid equilibria in NH3-H3PO4-HO system has been studied. In the vapor liquid equilibria calculation by using extended Pitzer equation

water activity and solute activity coefficients in aqueous phase were obtained. By the modified Redlich-Kwong equation of state

vapor phase fugacity coefficients were obtained. 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. The correlation model calculated data agreed well with the experimental equilibrium vapor pressure data up to concentrations 25 mol/kgH2O.

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