Densities and surface tensions of ionic liquids/sulfuric acid binary mixtures

doi:10.1016/j.cjche.2018.02.001

摘要/Abstract

摘要： The densities and surface tensions of[Bmim] [TFO]/H₂SO₄,[Hmim] [TFO]/H₂SO₄ and[Omim] [TFO]/H₂SO₄ binary mixtures were measured by pycnometer and Wilhelmy plate method respectively. The results show that densities and surface tensions of the mixtures decreased monotonously with increasing temperatures and increasing ionic liquid (IL) molar fraction. IL with longer alkyl side-chain length brings a lower density and a smaller surface tension to the ILs/H₂SO₄ binary mixtures. The densities and surface tensions of the mixtures are fitted well by Jouyban-Acree (JAM) model and LWW model respectively. Redlich-Kister (R-K) equation and modified Redlich-Kister (R-K) equation describe the excess molar volumes and excess surface tensions of the mixtures well respectively. Adding a small amount of ILs (χ_IL < 0.1) into sulfuric acid brings an obvious decrease to the density and the surface tension. The results imply that the densities and surface tensions of ILs/H₂SO₄ binary mixtures can be modulated by changing the IL dosage or tailoring the IL structure.

关键词: Ionic liquid, Sulfuric acid, Density, Surface tension, Excess property

Abstract: The densities and surface tensions of[Bmim] [TFO]/H₂SO₄,[Hmim] [TFO]/H₂SO₄ and[Omim] [TFO]/H₂SO₄ binary mixtures were measured by pycnometer and Wilhelmy plate method respectively. The results show that densities and surface tensions of the mixtures decreased monotonously with increasing temperatures and increasing ionic liquid (IL) molar fraction. IL with longer alkyl side-chain length brings a lower density and a smaller surface tension to the ILs/H₂SO₄ binary mixtures. The densities and surface tensions of the mixtures are fitted well by Jouyban-Acree (JAM) model and LWW model respectively. Redlich-Kister (R-K) equation and modified Redlich-Kister (R-K) equation describe the excess molar volumes and excess surface tensions of the mixtures well respectively. Adding a small amount of ILs (χ_IL < 0.1) into sulfuric acid brings an obvious decrease to the density and the surface tension. The results imply that the densities and surface tensions of ILs/H₂SO₄ binary mixtures can be modulated by changing the IL dosage or tailoring the IL structure.

Key words: Ionic liquid, Sulfuric acid, Density, Surface tension, Excess property

Tao Zhang, Jing Hu, Shengwei Tang. Densities and surface tensions of ionic liquids/sulfuric acid binary mixtures[J]. Chinese Journal of Chemical Engineering, 2018, 26(7): 1513-1521.

Tao Zhang, Jing Hu, Shengwei Tang. Densities and surface tensions of ionic liquids/sulfuric acid binary mixtures[J]. Chin.J.Chem.Eng., 2018, 26(7): 1513-1521.

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