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Measurement and modelling of water activity, density, sound velocity, refractive index and viscosity of the Na2MoO4 + poly(ethylene glycol) + H2O system in the temperature range from 313.15 to 333.15 K
Fluid Phase Equilibria ( IF 2.6 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.fluid.2020.112628
Francisca J. Justel , Grecia Villca , Yecid P. Jimenez

Abstract Thermodynamic and physical properties of water activity, density, sound velocity, refractive index and viscosity of unsaturated solutions of Na2MoO4 + PEG 4000 + H2O system and the constituent binary systems at 313.15, 323.15 and 333.15 K were studied. The concentration range of the solutions was from 0.02 to 0.17 mass fraction of Na2MoO4 and from 0.05 to 0.30 mass fraction of poly(ethylene glycol) with an average molar mass of 4000 g/mol. Water activities were correlated with the modified Pitzer model and physical properties were correlated by the Othmer's rule, obtaining in all cases a good agreement between the experimental and correlated data. Water activity predictions for the Na2MoO4 + PEG 2000 + H2O and Na2MoO4 + PEG 4000 + H2O systems were performed with the modified Pitzer and extended UNIQUAC models, respectively, showing that both thermodynamic models can operate independently of the molar mass of the polymer used.

中文翻译:

在 313.15 到 333.15 K 的温度范围内测量和建模 Na2MoO4 + 聚(乙二醇)+ H2O 系统的水活度、密度、声速、折射率和粘度

摘要 研究了Na2MoO4 + PEG 4000 + H2O体系及其组成二元体系在313.15、323.15和333.15 K的不饱和溶液的水活度、密度、声速、折射率和粘度的热力学和物理性质。溶液的浓度范围为 0.02 至 0.17 质量分数的 Na2MoO4 和 0.05 至 0.30 质量分数的聚(乙二醇),平均摩尔质量为 4000 g/mol。水分活度与修改后的 Pitzer 模型相关,物理性质通过 Othmer 规则相关,在所有情况下都获得了实验数据和相关数据之间的良好一致性。Na2MoO4 + PEG 2000 + H2O 和 Na2MoO4 + PEG 4000 + H2O 系统的水分活度预测分别使用改进的 Pitzer 和扩展的 UNIQUAC 模型进行,
更新日期:2020-08-01
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