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upper-bound observed for dense polymers, including commercial ones (Figure 10, Table 4). They also have demonstrated excellent stability in chemically challenging environments as well as thermal stability overab roadtemperature range(sub-ambientto> 200°C). A sar esult, thisclassofmaterialshas separation pe rformance c haracteristics t hat d emonstrate t heir p otential as a m edium f or t he removal o f CO2 from flue gas. The industrial implementation of this class of exciting materials has not yet been realized for this application due to low productivity (permeance) and the mechanical stability limitations inherent to the IL-SLM format. Table 4. Gas transport properties of various supported ionic liquid membranes. Some unpublished data recently obtained by the Noble group is also included [55] (PES: polyethersulfone; PSF: polysulfone). Ionic Liquid [emim][Tf2N] [emim][CF3SO3] [emim][dca] [thtdp][Cl] [H2NC3H6mim][Tf2N] [hmim][Tf2N] [bmim][BF4] [C6mim][Tf2N] [C6mim][Tf2N] [emim][Tf2N] [emim][dca] Support CO2 Permeability (Barrer) PES 960 PES 920 PES 610 PES 350 nylon 80 PSF 860 PES 2500 PES 700 PES 650 Anodisc 1628 Anodisc 946 CO2/N2 selectivity 21 35 61 15 - - 55 23 22 36 58 Reference Scovazzo[53] Scovazzo[53] Scovazzo[53] Scovazzo[53] Myers[56] Llconich[57] Zhao[58] Voss[50] Voss[50] Noble[55] Noble[55] Thus, the key challenges hindering the realization of a transformational separations technology based on IL membranes for flue gas application are: 1. The a chievement o f a m echanically st able, c ommercially v iable I L m embrane p latform t hat retains the chemical stability, thermal stability, and permselectivity characteristics that have been demonstrated in this class of materials. 2. Realization o f su ch a platform i n c oncert w ith the development of a f abrication/coating technology t o e nable pr eparation of v ery t hin, hi gh permeance, defect-free se lective l ayer films (≤ 1 μm) on a suitable support. The ultimate game changing technology resulting from the s uccessful ach ievement o f t hose g oals w ould b e a ch emically, m echanically, an d thermally r obust I L-based membrane s ystem w ith a pe rmeance of > 10,000 G PU a nd a selectivity of at least 20 under industrially relevant operating conditions (see Figure 9) that will exceed the current DOE targets ($20-25 per ton of CO2; <35 % increase in COE) in sensational fashion. 3. A commercial process for removal of smoke and oxides of sulphur from flue gases 3.2 Solid Adsorbents New classes of solid adsorbents are being investigated to complement the existing arsenal of ionic liquid absorbents and transport-controlling membranes. These new hybrid materials consist of metal ions with well-defined coordination geometry linked to organic bridging ligands. Carbon Capture Factual Document 26PDF Image | 2020 Carbon Capture
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