Advances in high permeability polymer-based membrane materials for CO₂ separations

Abstract

This review summarizes the major advances since 2012 in highly permeable and CO2-selective polymer-based membrane materials.

Accelerating Membrane‐based CO2 Separation by Soluble Nanoporous Polymer Networks Produced by Mechanochemical Oxidative Coupling

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Achievingh omogeneous dispersion of nanoporous fillers within membrane architectures remains agreat challenge for mixed-matrix membrane (MMMs) technology.I mparting solution processability of nanoporous materials would help advance the development of MMMs for membrane-based gas separations.Amechanochemicallyassisted oxidative coupling polymerization strategy was used to create an ew family of soluble nanoporous polymer networks.T he solid-state ballmilling method affords inherent molecular weight control over polymer growth and therefore provides unexpected solubility for the resulting nanoporous frameworks.M MM-based CO 2 / CH 4 separation performance was significantly accelerated by these new soluble fillers.W ea nticipate this facile method will facilitate new possibilities for the rational design and synthesis of soluble nanoporous polymer networks and promote their applications in membrane-based gas separations.

The interest in curtailing greenhouse gas emissions through capture of CO 2 from flue gas and removal of CO 2 from synthesis gas (mainly CH 4 and H 2 )h as inspired an extensive search for novel methods capable of efficient separation of CO 2 . [2] Among the various types of CO 2 -selective membranes, polymeric membranes have been the most widely studied, whereas they suffer from awell-known compromise between the permeability and selectivity as shown in the upper bound Robeson curves. [2] Among the various types of CO 2 -selective membranes, polymeric membranes have been the most widely studied, whereas they suffer from awell-known compromise between the permeability and selectivity as shown in the upper bound Robeson curves.

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A strategy to enhance CO2 permeability of well-defined hyper-branched polymers with dense polyoxyethylene comb graft

“…However, the defects are not serious, and the selective layer still maintains moderate CO 2 selectivity of >20, similar to various polyimides developed for CO 2 capture [49], including polymers of intrinsic microscopy PIM-1 [50]. It is clear that higher POEM fraction >40 wt% resulted in higher CO 2 permeability, and that the P composite exceeded 1,000 barrer for a l selective smaller than 24 µm.…”

Widening CO2-facilitated transport passageways in SPEEK matrix using polymer brushes functionalized double-shelled organic submicrocapsules for efficient gas separation

“…The emission of greenhouse gas CO 2 has aroused accelerating exploration of innovative solutions for CO 2 capture and sequestration [1]. In recent years, membrane technology for gas separation provides an opportunity to diminish CO 2 emission due to the inherent advantages, such as easy processability and cost-effectivity and environmental friendliness [2].…”

“…Mixed matrix membranes (MMMs) composed of an inorganic filler and a polymer matrix have exhibited the potential of surpassing the trade-off limit [1,[4][5][6][7][8][9][10][11][12]. Fillers such as porous zeolite [13,14], silica nanoparticles [15,16], carbon nanotubes (CNTs) [9,17,18] metal-organic frameworks [19][20][21][22][23], and graphene oxide [24,25] have been doped in different polymer matrix to develop new MMMs with improved gas separation performance.…”