25°C下K_2SO_4-(NH_4)_2SO_4-CO(NH_2)_2-H_2O四元体系的相平衡  

Phase Equilibrium of the Quaternary K_2SO_4-(NH_4)_2SO_4-CO(NH_2)_2-H_2O System at 25°C

作　　者：章永洁[1] 曹吉林[1] 李琳[2] 任宝山[1] 

机构地区：[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　　处：《过程工程学报》2003年第3期212-217,共6页The Chinese Journal of Process Engineering

基　　金：河北省自然科学基金资助项目(编号: 200004);河北省教委博士基金资助项目

摘　　要：测定了25C下K2SO4CO(NH2)2H2O及(NH4)2SO4CO(NH2)2H2O 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25oC下K2SO4(NH4)2SO4CO(NH2)2H2O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.The solubilities of both ternary K2SO4CO(NH2)2H2O and (NH4)2SO4CO(NH2)2H2O systems and the quaternary K2SO4(NH4)2SO4CO(NH2)2H2O 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)2SO4CO(NH2)2H2O 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.

关 键 词：硫酸钾 硫酸铵 尿素 相平衡 活度系数 复盐 四元体系 肥料 

分 类 号：TQ444[化学工程—化学肥料工业] O642.42[理学—物理化学]