Deep Eutectic Solvent + Water System in Carbon Dioxide Absorption.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Deep eutectic solvents (DESs) are emerging as promising alternatives for CO2 capture.
• Traditional CO2 capture methods often involve energy-intensive processes and environmental concerns.

Purpose of the Study:

• To synthesize and characterize novel DES + water systems for CO2 capture.
• To evaluate the CO2 trapping capacity of these systems under various conditions.
• To compare their performance against established industrial standards.

Main Methods:

• One-step synthesis of DESs using tetrabutylammonium bromide (HBA) and ethanolamine (HBD).
• Density measurements using the U-tube oscillation method (293.15–363.15 K).
• CO2 solubility determination via isovolumetric saturation (0.1–1 MPa, 303.15–323.15 K).
• Data fitting using a semi-empirical model.

Main Results:

• Densities of DES + water systems were successfully measured across a temperature range.
• CO2 solubility in DES + water systems was quantified at different pressures and temperatures.
• At 303.15 K and 100 kPa, CO2 solubilities reached up to 0.1540 g/g for specific molar ratios.

Conclusions:

• The synthesized DES + water systems demonstrate significant CO2 capture capabilities.
• These systems exhibit superior CO2 trapping efficiency compared to 30% aqueous monoethanolamine.
• The findings highlight the potential of DES + water systems for efficient and effective CO2 capture technologies.