Encapsulated liquid sorbents for carbon dioxide capture.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Current carbon dioxide (CO2) capture technologies face challenges including corrosivity, solvent evaporative losses, and equipment fouling.
• Microencapsulation presents a novel approach to mitigate these drawbacks by isolating the capture solvent from the surrounding infrastructure and effluent gases.

Purpose of the Study:

• To develop and evaluate novel microencapsulated materials for low-cost and energy-efficient carbon dioxide capture from flue gas.
• To demonstrate the effectiveness of microencapsulation in enhancing CO2 absorption rates and stability under industrial conditions.

Main Methods:

• Production of polymer microcapsules using microfluidic assembly, featuring liquid carbonate cores and highly permeable silicone shells.
• Characterization of CO2 absorption and release kinetics, stability, and mass transport properties of the microcapsules.
• Evaluation of microcapsule performance in simulated industrial operating conditions.

Main Results:

• Microencapsulation couples the high capacity and selectivity of liquid sorbents with a significantly increased surface area, leading to an order-of-magnitude rise in CO2 absorption rates compared to neat sorbents.
• While shell mass transport is slightly reduced, the overall CO2 uptake is enhanced due to the surface area increase.
• The developed microcapsules demonstrate stability under typical industrial operating conditions, suitable for large-scale applications.

Conclusions:

• Microencapsulated liquid carbonate sorbents offer a promising pathway for overcoming the limitations of conventional CO2 capture methods.
• These materials enable efficient and cost-effective carbon dioxide capture, with potential applications in supported packing and fluidized beds for industrial flue gas treatment.