Abstract: The solubility of NH3 in multiple systems under high pressure is of extreme importance to the new integrated ammonia and urea process. This paper proposes a new method for calculating the vapor-liquid equilibria for aqueous ammonia solutions under high pressure. Based on the experimental data of the binary system NH3-H2O in the high concentration range, a model has been established for the activity coefficients of NH3 and H2O to describe the non-ideality of the liquid phase; and the modified SIRK equation of state for polar compounds has been used to describe the nonideali-ty of the vapor phase at high pressures. The reliability of this model has been examined in the light of the experimental date of the solubility of NH3 under high pressure in the systems NH3-H2O-N2, NH3-H2O-N2-H2-Ar-CH4, and NH3-H2O-N2-H2, the last from Cuerreri et al. Both the accuracy of calculation and the concentration range for applicability of this model have been found to surpass those of Curreris model.

摘要： 本文提供了一个计算高压下氨、水有关体系汽液平衡的新方法:用浓氨水范围NH_3-H_2O二元系汽液平衡实验数据,求得氨及水的活度系数模型来表征液相的非理想性;用极性修正的SIRK状态方程来描述高压下汽相的非理想性.并进一步用本实验在高压下测得的NH_3-H_2O-N_2三元系及NH_3-H_2O-N_2-H_2-Ar-CH_4六元系中氨溶解度数据及Guerreri等发表的NH_3-H_2O-N_2-H_2四元系实验数据来考察本模型的可靠性,均获得了令人满意的结果,且本模型在高压下的计算精度和浓度适用范围,均优于Guerreri模型.