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Accurate modeling of deep eutectic solvents (DESs) requires understanding solid-liquid equilibria (SLE). Key factors include melting properties and liquid phase activity coefficients for reliable DES design.

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Chemical Engineering

Background:

  • Deep eutectic solvents (DESs) offer sustainable alternatives to conventional solvents.
  • Understanding solid-liquid equilibria (SLE) is crucial for DES characterization and application.
  • Accurate thermodynamic modeling of DESs is essential for their design and selection.

Purpose of the Study:

  • To highlight key aspects for improved modeling and prediction of SLE in DESs.
  • To comprehensively study parameters required for thermodynamic modeling of SLE.
  • To analyze the influence of melting properties and activity coefficients on SLE.

Main Methods:

  • Thermodynamic modeling of SLE for a hypothetical binary mixture and real DESs.
  • Analysis of pure DES constituent melting properties (melting enthalpy, melting temperature).
  • Evaluation of activity coefficients in the liquid phase to understand non-ideality.

Main Results:

  • Deepest eutectic temperatures are favored by low melting enthalpies and strong negative deviations from ideality.
  • Variations in melting enthalpy significantly alter chemical potential differences, impacting activity coefficients.
  • Accurate estimation of pure component melting properties is vital for interpreting liquid phase interactions.

Conclusions:

  • Reliable modeling of liquid phase non-ideality in DESs is significant.
  • Accurate estimation of pure constituent melting properties is crucial for understanding SLE behavior.
  • This understanding is essential for the rational design of new DES systems.