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Playing with ionic liquid mixtures to design engineered CO2 separation membranes.

Liliana C Tomé1, Catarina Florindo, Carmen S R Freire

  • 1Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157 Oeiras, Portugal. imarrucho@itqb.unl.pt.

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Summary

Binary ionic liquid mixtures with specific anions show promise for efficient carbon dioxide (CO2) separation membranes. These tailored mixtures offer tunable properties for enhanced gas separation in industrial applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Ionic liquids offer low volatility and tunable properties for CO2 separation.
  • Developing efficient membranes is crucial for flue gas and natural gas purification.

Purpose of the Study:

  • To design highly efficient liquid phases for CO2 separation using binary ionic liquid mixtures.
  • To investigate the gas transport properties of supported ionic liquid membranes (SILMs) made from these mixtures.

Main Methods:

  • Preparation of binary ionic liquid mixtures with sulfate and/or cyano-functionalized anions.
  • Measurement of gas transport properties (permeability, diffusivity, solubility) through SILMs.
  • Evaluation of thermophysical properties (viscosity, density) and their correlation with transport properties.

Main Results:

  • Ionic liquid mixtures allow for fine-tuning of gas permeabilities, diffusivities, and solubilities.
  • SILMs exhibited high CO2/N2 separation performance, potentially surpassing existing benchmarks.
  • A correlation between transport properties and thermophysical properties was established.

Conclusions:

  • Binary ionic liquid mixtures are a promising strategy for developing advanced CO2 separation membranes.
  • Combining selective and low-viscosity anions in mixtures enhances membrane performance.
  • These engineered liquid phases show potential for low-pressure post-combustion CO2 capture.