化工学报2024，Vol.75Issue(2)：463-474,12.DOI:10.11949/0438-1157.20230960
六氟化铀及氟化物汽液相平衡数据预测及精馏过程模拟
Prediction of vapor-liquid equilibrium data of uranium hexafluoride and fluoride and simulation of distillation process
摘要
Abstract
The purification of uranium hexafluoride by distillation technology is an important part of the uranium conversion process.The simulation of the distillation process can provide key support for process design and operation optimization.However,due to the lack of vapor-liquid equilibrium and physical properties data for uranium hexafluoride and fluoride,modelling and simulating the purification process of uranium hexafluoride became challenging.To address this issue,we utilized COSMOtherm and Turbomole software to predict vapor-liquid equilibrium data for UF6-TiF4 binary systems.We indirectly verified the accuracy of the COSMO-RS model by predicting known experimental data on vapor-liquid equilibrium for WF6-UF6 binary system.Additionally,Aspen Plus software's property constant estimation system was employed to estimate missing physical properties such as infinitely dilute aqueous Gibbs generating energy.The UF6 saturated vapor pressure experimental data and simulated values in the literature were compared,and the relative error was within 1.76%.Based on experimental data and predicted vapor-liquid phase equilibrium data in the literature,Aspen Plus software was used to regress the binary interaction parameters of the NRTL model.For separating uranium hexafluoride from fluoride,two purification schemes were designed:one involving direct separation sequence and another involving indirect separation sequence.Sensitivity analysis was conducted to optimize key parameters including plate number,feed position,and reflux ratio to minimize total annual cost(TAC)while maintaining desired purity levels in UF6 product output streams.The results indicated that TAC was lower for the indirect separation sequence purification scheme.关键词
氟化物/物性估算/汽液平衡/精馏Key words
fluoride/physical property estimation/vapor-liquid equilibria/distillation分类
化学化工引用本文复制引用
杨同,王欢,邓春..六氟化铀及氟化物汽液相平衡数据预测及精馏过程模拟[J].化工学报,2024,75(2):463-474,12.基金项目
国家自然科学基金项目(U2267226) （U2267226）
