尿素溶液分离体系的汽液平衡  

Vapor-liquid equilibrium of urea solution separation system

作　　者：魏顺安[1] 杨楠[1] 付雪梅[1] 董立春[1] 张舒雯[1] 

机构地区：[1]重庆大学化学化工学院,重庆400044

出　　处：《化学工程》2011年第11期83-87,共5页Chemical Engineering(China)

基　　金：中央高校基本科研业务费资助项目(CDJZR10220010)

摘　　要：以NH3,CO2为原料的合成尿素溶液中含有NH3,CO2,H2O,NH2CONH2等组分,在减压解吸、蒸发等过程中都需要NH3-CO2-H2O-NH2CONH2无尿素反应体系的汽液平衡计算。文中采用文献中NH3-CO2-H2O体系以及上述四元体系在温度为60—160℃、压力小于3.0 MPa、液相NH3摩尔分率小于0.3范围内的汽液平衡实验数据,汽液平衡计算中用SRK方程计算气相组分的逸度系数,用扩展型UNIQUAC方程计算溶液中各真实组分的活度系数,并采用单纯形法回归UNIQUAC方程中的相互作用能参数(该参数与温度相关)。模型的模拟计算结果和实验数据吻合较好。The urea solution synthesized from NH3 and CO2 is composed of NH3,CO2,H2O and NH2CONH2.The subsequent processes of decreased-pressure desorption and evaporation are related to the system of NH3-CO2-H2O-NH2CONH2（ACWU） vapor-liquid equilibrium,in which the hydrolysis reaction of urea can be neglected.The SRK equation of state was used to calculate the fugacity coefficients of vapor phase and the activity coefficients of the actual species in liquid phase was described by the extended UNIQUAC equation.A set of temperature-dependent interactive energy parameters of the extended UNIQUAC equation were obtained by simplex method to calculate the ACWU VLE in the conditions of temperature from 60 ℃ to 160 ℃,pressure up to 3.0 MPa and the mole fraction of NH3 up to 0.3.It shows that the results of simulation are consistent very well with the literature data.

关 键 词：NH3-CO2-H2O-NH2CONH2 汽液平衡 扩展型UNIQUAC方程 二元相互作用能参数 

分 类 号：TQ440.1[化学工程—化学肥料工业]