Phase Equilibrium of NH_3-CO_2-H_2O-NH_2CONH_2 System at High Temperature and Pressure in Urea Synthesis

Hu Liegi; Wei Boyi and Shen HuaminShanghai Research Institute of Chemical Industry; Shanghai

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Phase Equilibrium of NH_3-CO_2-H_2O-NH_2CONH_2 System at High Temperature and Pressure in Urea Synthesis

更新时间：2025-12-16

- Phase Equilibrium of NH_3-CO_2-H_2O-NH_2CONH_2 System at High Temperature and Pressure in Urea Synthesis
- CIESC Journal Issue 6, (1990)
- 作者机构：
  
  上海化工研究院,上海化工研究院,上海化工研究院 ,上海,上海,上海
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 December 1990，
  
  Published：25 December 1990
- 稿件说明：
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Hu Liegi, Wei Boyi and Shen HuaminShanghai Research Institute of Chemical Industry, Shanghai. Phase Equilibrium of NH_3-CO_2-H_2O-NH_2CONH_2 System at High Temperature and Pressure in Urea Synthesis[J]. CIESC Journal, 1990, (6).
DOI：

Hu Liegi, Wei Boyi and Shen HuaminShanghai Research Institute of Chemical Industry, Shanghai. Phase Equilibrium of NH_3-CO_2-H_2O-NH_2CONH_2 System at High Temperature and Pressure in Urea Synthesis[J]. CIESC Journal, 1990, (6). DOI：

摘要

提出了一个适用于尿素合成条件下(T=438.15～478.15K

P=6.87～24.5MPa

NH_3/CO_2=2.6～5.0

H_2O/CO_2=0.2～1.2)NH_3-CO_2-H_2O-NH_2CONH_2体系的热力学模型

该模型用PHS状态方程和Wilson方程来分别修正气液两相的非理想行为

用本模型可对尿素合成体系进行有效的汽液平衡计算.

Abstract

A new thermodynamic model for ammonia-carbon dioxide-water-urea system at the condition of urea synthesis (T=438.15-478.15K

P=6.87-24.5 MPa

NH3/CO2 = 2.6-5.0

H2O/CO2= 0.2-1.2) is established on the basis of experimental data. Perturbed-hard-sphere equation of state and Wilson equation are use to treat the non-idealities of vapor and liquid phases. Correlations of the experimental data at 433.15K

438.15K

448.15K

458.15K

468.15K and 478.15K are made with this model. The mean relative deviation of molar fraction of ammonia and carbon dioxide in vapor phase is 3.05% and 8.27% respectively

and the mean relative deviation of total pressure is 3.31%. The calculated values of pressure with this mode] are in agreement with those of industrial synthesis of urea.

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