Highly efficient amino-functionalized ionic liquid membrane contactor coupled system for low-concentration carbon...

Area of Science:

• Chemical Engineering
• Environmental Science
• Materials Science

Background:

• Carbon dioxide (CO2) capture and storage (CCS) is vital for decarbonization but faces challenges with low-concentration CO2 capture due to high energy costs and material degradation.
• Existing technologies struggle with efficiency and energy demands when dealing with dilute CO2 streams common in industrial emissions.

Purpose of the Study:

• To develop and evaluate novel amino-functionalized ionic liquids (AFILs) for efficient capture of low-concentration CO2.
• To assess the performance of AFILs integrated with a polytetrafluoroethylene (PTFE) hollow fiber membrane contactor for CO2 absorption and desorption.
• To investigate energy-saving benefits through optimized regeneration processes.

Main Methods:

• Synthesis and characterization of four distinct AFILs.
• Evaluation of AFILs in a PTFE hollow fiber membrane contactor for CO2 absorption at low concentrations (7-15%).
• Assessment of CO2 desorption efficiency and energy requirements using a membrane-based regeneration technique.

Main Results:

• Triethylenetetramine formate ([TETA][HCOO]) demonstrated superior CO2 absorption performance among the tested AFILs.
• A decarbonization rate of 98% was achieved using the [TETA][HCOO] and membrane contactor system.
• The membrane desorption method significantly improved regeneration rates and reduced regeneration temperatures, indicating substantial energy savings.

Conclusions:

• The developed AFILs, particularly [TETA][HCOO], offer a promising solution for low-concentration CO2 separation.
• The integrated membrane contactor and optimized desorption system provides high absorption and desorption efficiency.
• This technology presents a viable, energy-efficient approach for industries to reduce their carbon footprint from dilute CO2 emissions.