N_2O_4-N_2O_5-HNO_3体系液液平衡数据测定

Measurement of Liquid-Liquid Equilibrium Data for the N_2O_4-N_2O_5-HNO_3 System

采用浊点法测定了N2O4-N2O5-HNO3体系在258.2-281.2K的液液平衡和固液平衡数据,得到了固液平衡临界点及N2O5在N2O4和HNO3中的溶解度、N2O4在HNO3中的溶解度和HNO3在N2O4中的溶解度数据,确定了液液平衡区域和近似固液平衡区域。结果表明,随着温度的升高,两相区逐渐减小;N2O5在N2O4和HNO3中的溶解度、N2O4在HNO3中的溶解度和HNO3在N2O4中的溶解度均增大。

Liquid-Liquid and Solid-Liquid equilibrium data for the N2O4-N2O5-HNO3 system were measured by cloud point method at 258.2-281,2 K. The critical points and the solubilities of dinitrogen pentoxide in dinitrogen tetroxide and nitric acid, dinitrogen tetroxide in nitric acid and nitric acid in dinitrogen tetroxide were obtained separately. The Liquid-Liquid equilibrium area and Solid-Liquid equilibrium area were determined. With the increase of temperature, the two phase area reduces and the solubilities of dinitrogen pentoxide in dinitrogen tetroxide and nitric acid, dinitrogen tetroxide in nitric acid and nitric acid in dinitrogen tetroxide increase, respectively.