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›› 2003, Vol. 3 ›› Issue (3): 0-0.

• 3 •    

25℃下K2SO4–(NH4)2SO4–CO(NH2)2–H2O四元体系的相平衡

章永洁,曹吉林,李琳,任宝山   

  1. 1. 河北工业大学化工学院, 天津 300130; 2. 河北工业大学软件学院, 天津 300130
  • 出版日期:2003-06-20 发布日期:2003-06-20

Phase Equilibrium of the Quaternary K2SO4–(NH4)2SO4–CO(NH2)2–H2O System at 25oC

ZHANG Yong-jie1, CAO Ji-lin1, LI Lin2, REN Bao-shan1   

  1. 1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China; 2. Software School, Hebei University of Technology, Tianjin 300130, China
  • Online:2003-06-20 Published:2003-06-20

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摘要： 测定了25℃下K2SO4–CO(NH2)2–H2O及(NH4)2SO4–CO(NH2)2–H2O 两个三元体系相平衡的数据，并依据Pitzer电解质溶液理论对实验测定值进行了关联，关联结果与实验测定值相吻合. 通过测定25℃下K2SO4–(NH4)2SO4–CO(NH2)2–H2O四元体系的相平衡数据可知尿素不能与硫酸钾或硫酸铵形成复盐，因此该四元体系的相平衡数据可近似由其所含三元体系的相互作用参数推算得出.

关键词: 硫酸钾, 硫酸铵, 尿素, 相平衡, 活度系数

Abstract: The solubilities of both ternary K2SO4–CO(NH2)2–H2O and (NH4)2SO4–CO(NH2)2–H2O systems and the quaternary K2SO4–(NH4)2SO4–CO(NH2)2–H2O system were measured at 25oC. On the basis of Pitzer electrolyte solution theory, the experimental results were calculated and the calculated values agree with the experimental data. According to the phase equilibrium of the quaternary system of K2SO4–(NH4)2SO4–CO(NH2)2–H2O at 25oC, it is found that no double salt is formed by K2SO4 or (NH4)2SO4 with CO(NH2)2, and thus the phase equilibrium of the quaternary system can be calculated with the ternary system interaction coefficients.

Key words: potassium sulfate, ammonium sulfate, urea, phase equilibrium, activity coefficient

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