Enhanced O₂/N₂ separation by QuaternizedMatrimid/Multiwalled carbon nanotube mixed-matrix membrane.

Area of Science:

• Materials Science
• Chemical Engineering
• Membrane Technology

Background:

• Polymeric membranes are crucial for energy-efficient air separation (O2/N2), surpassing traditional methods.
• Dense polymeric membranes are widely used industrially for oxygen and nitrogen enrichment.
• Standard membranes struggle with O2/N2 separation due to similar gas molecule sizes, limiting performance.

Purpose of the Study:

• To develop high-performance nanocomposite (NC) membranes for improved O2/N2 separation.
• To investigate the effect of chemically modified Matrimid and multiwall carbon nanotubes (MWCNTs) on membrane properties.
• To enhance selectivity and permeability for industrial air separation applications.

Main Methods:

• Utilized Matrimid® 5218 as the base polymer and multiwall carbon nanotubes (MWCNTs) as filler.
• Chemically modified Matrimid via quaternization and MWCNTs via functionalization (f-MWCNT).
• Fabricated membranes using solution casting with quaternized Matrimid and f-MWCNT.

Main Results:

• The novel NC membranes exhibited enhanced interfacial compatibility between the polymer and filler.
• Achieved a significant 65% increase in O2/N2 selectivity and a 35% increase in permeability.
• Improved performance attributed to increased O2 diffusivity and O2/N2 solubility selectivity.

Conclusions:

• Chemically modified nanocomposite membranes show superior performance for O2/N2 separation.
• The developed membranes offer a promising route for innovative manufacturing in air separation.
• This advancement addresses limitations of conventional polymeric membranes in achieving high selectivity and permeability.