Separation potential of 1,5-pentanediol-based deep eutectic solvent: Infinite dilution activity coefficients and...

Area of Science:

• Physical Chemistry
• Chemical Engineering
• Materials Science

Background:

• Ionic liquids and deep eutectic solvents (DES) are gaining traction as sustainable alternatives in chemical processes.
• Accurate thermodynamic data is essential for designing efficient separation technologies.

Purpose of the Study:

• To measure the infinite dilution activity coefficients for 32 diverse solutes in the {1-ethyl-1-methylpyrrolidinium bromide + 1,5-pentanediol} DES.
• To compute partial molar properties (enthalpy, entropy, Gibbs free energy) and separation parameters (capacity, selectivity) for the studied DES.
• To provide essential thermodynamic data for the industrial application of this novel DES.

Main Methods:

• Gas liquid chromatography (GLC) with pre-saturated helium gas was employed for accurate measurements.
• Measurements were conducted across a temperature range of 313.15–343.15 K at atmospheric pressure.
• Thermodynamic properties and separation metrics were calculated based on the experimental data.

Main Results:

• New experimental data for infinite dilution activity coefficients were obtained for 32 solutes, including alkanes, aromatics, and polar compounds.
• Calculated partial molar properties and separation parameters (capacity, selectivity) highlight the potential of the [[EMPYR] Br + 1,5-PDO] DES for specific binary mixtures.
• Comparison with literature data validates the accuracy and reliability of the generated thermodynamic data.

Conclusions:

• The [[EMPYR] Br + 1,5-PDO] DES exhibits promising thermodynamic properties for industrial separation applications.
• The collected data serves as a valuable resource for solvent selection in processes like solvent extraction and distillation.
• This research contributes to the development of efficient and sustainable chemical separation technologies.