Volumetric and phase behaviour of mixtures of tetracyanoborate-based ionic liquids with high pressure carbon dioxide

Małgorzata E. Zakrzewska, Manuel Nunes da Ponte

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The high-pressure solubility of carbon dioxide in ionic liquids based on tetracyanoborate anion, 1-ethyl-3-methylimidazolium tetracyanoborate ([emim][B(CN)4]) and 1-hexyl-3-methylimidazolium tetracyanoborate ([hmim][B(CN)4]), was determined experimentally at the temperature of 313.15 K and pressures up to 19 MPa. Additionally, measurements of volume expansion of a liquid phase, based on a change in total or molar volume of a liquid upon carbon dioxide addition, are reported. The obtained results show that CO2 has a high solubility in tetracyanoborate-based ionic liquids, comparable, or even slightly higher, to the CO2 solubility in fluorinated CO2-philic ionic liquids. Approximately 60% CO2-induced volume expansion of the liquid was observed at the highest pressures, an unprecedented result for ionic liquid+ CO2 systems.

Original languageEnglish
Pages (from-to)31-38
Number of pages8
JournalJournal of Supercritical Fluids
Volume113
DOIs
Publication statusPublished - 1 Jul 2016

Fingerprint

Ionic Liquids
Phase behavior
Ionic liquids
Carbon Dioxide
carbon dioxide
Carbon dioxide
Solubility
liquids
Liquids
solubility
Density (specific gravity)
Anions
expansion
Negative ions
liquid phases
anions
Temperature

Keywords

  • Carbon dioxide
  • High-pressure solubility
  • Ionic liquid
  • Tetracyanoborate anion
  • Volume expansion

Cite this

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title = "Volumetric and phase behaviour of mixtures of tetracyanoborate-based ionic liquids with high pressure carbon dioxide",
abstract = "The high-pressure solubility of carbon dioxide in ionic liquids based on tetracyanoborate anion, 1-ethyl-3-methylimidazolium tetracyanoborate ([emim][B(CN)4]) and 1-hexyl-3-methylimidazolium tetracyanoborate ([hmim][B(CN)4]), was determined experimentally at the temperature of 313.15 K and pressures up to 19 MPa. Additionally, measurements of volume expansion of a liquid phase, based on a change in total or molar volume of a liquid upon carbon dioxide addition, are reported. The obtained results show that CO2 has a high solubility in tetracyanoborate-based ionic liquids, comparable, or even slightly higher, to the CO2 solubility in fluorinated CO2-philic ionic liquids. Approximately 60{\%} CO2-induced volume expansion of the liquid was observed at the highest pressures, an unprecedented result for ionic liquid+ CO2 systems.",
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Volumetric and phase behaviour of mixtures of tetracyanoborate-based ionic liquids with high pressure carbon dioxide. / Zakrzewska, Małgorzata E.; Nunes da Ponte, Manuel.

In: Journal of Supercritical Fluids, Vol. 113, 01.07.2016, p. 31-38.

Research output: Contribution to journalArticle

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AU - Zakrzewska, Małgorzata E.

AU - Nunes da Ponte, Manuel

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N2 - The high-pressure solubility of carbon dioxide in ionic liquids based on tetracyanoborate anion, 1-ethyl-3-methylimidazolium tetracyanoborate ([emim][B(CN)4]) and 1-hexyl-3-methylimidazolium tetracyanoborate ([hmim][B(CN)4]), was determined experimentally at the temperature of 313.15 K and pressures up to 19 MPa. Additionally, measurements of volume expansion of a liquid phase, based on a change in total or molar volume of a liquid upon carbon dioxide addition, are reported. The obtained results show that CO2 has a high solubility in tetracyanoborate-based ionic liquids, comparable, or even slightly higher, to the CO2 solubility in fluorinated CO2-philic ionic liquids. Approximately 60% CO2-induced volume expansion of the liquid was observed at the highest pressures, an unprecedented result for ionic liquid+ CO2 systems.

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