A prototype for producing oxygen-rich air using novel magnetic separation cell and magnetic mixed poly(etheresulfone) matrix membranes

Abstract

A meticulously designed prototype for the production of oxygen-rich air was developed, focusing on the separation of oxygen and nitrogen gases through a bespoke magnetic gas separation cell utilizing magnetic mixed matrix membranes. The nanostructured Fe₁₀Ni₉₀ and Fe₂₀Ni₈₀ alloys were fabricated by simple reduction and were embedded in a Poly(ethersulfone) (PES) matrix. The separation mechanism exploits the divergent magnetic properties of the gases-oxygen being paramagnetic and nitrogen diamagnetic-whereby magnetic attraction facilitates the extraction of oxygen molecules from the gas stream, enriching the permeate. Central to this study are three pivotal areas: first, the membrane preparation method employs an innovative attraction mechanism between permanent magnetic alloys and an iron casting knife, enabling a linear alignment of fillers without sedimentation and eliminating the need for a magnetic field during casting. This significantly enhances the integrity and performance of the fabricated mixed PES matrix membrane. Second, the flat sheet gas separation cell features a unique ribbed structure on the permeate side, filled with a magnetic Fe₁₀Ni₉₀ alloy, poised to optimize gas permeation rates by augmenting the separation force on both the membrane and permeate side. Third, the robust stainless-steel construction and specific dimensions of the cell, providing an effective area of 95 cm², stand in stark contrast to older, more complex geometries. This comprehensive approach resulted in a remarkable 55% increase in permeability and a 40% enhancement in oxygen content.