Effect of amine structure on CO₂ capture by polymeric membranes

Abstract

Poly(amidoamine)s (PAMAMs) incorporated into a cross-linked poly(ethylene glycol) exhibited excellent CO2 separation properties over H2. However, the CO2 permeability should be increased for practical applications. Monoethanolamine (MEA) used as a CO2 determining agent in the current CO2 capture technology at demonstration scale was readily immobilized in poly(vinyl alcohol) (PVA) matrix by solvent casting of aqueous mixture of PVA and the amine. The resulting polymeric membranes can be self-standing with the thickness above 3 μm and the amine fraction less than 80 wt%. The gas permeation properties were examined at 40 °C and under 80% relative humidity. The CO2 separation performance increased with increase of the amine content in the polymeric membranes. When the amine fraction was 80 wt%, the CO2 permeability coefficient of MEA containing membrane was 604 barrer with CO2 selectivity of 58.5 over H2, which was much higher than the PAMAM membrane (83.7 barrer and 51.8, respectively) under the same operation conditions. On the other hand, ethylamine (EA) was also incorporated into PVA matrix to form a thin membrane. However, the resulting polymeric membranes exhibited slight CO2-selective gas permeation properties. The hydroxyl group of MEA was crucial for high CO2 separation performance.

Amine-based capture of CO2 for utilization and storage

“…As an alternative to FSCs, mobile carriers such as MEA and MDEA have been proposed to improve carrier mobility by incorporating them into a suitable polymer matrix such as PVA [95,96]. Taniguchi et al [97] found that the hydroxy group of incorporated alkanolamines could significantly facilitate the transport of CO 2 due to the intramolecular hydrogen bonding effect. In addition to conventional alkanolamines, diamines are also a good alternative for the transport of CO 2 [98,99].…”

CO2 capture using membrane contactors: a systematic literature review

“…[447][448][449][450][451]453,454,456,458,459,[463][464][465][466][467]472,473,475,[478][479][480]482,483,[484][485][486][487][488][489]496,497,[500][501][502]505,506,508,513,514,516,517,519,521,523,524,528,533,538,543]. One of the reasons for the low popularity of hydrophilic membranes is the low thermal and chemical stability of membranes, which in turn has an effect on the flux, demonstrated in Table…”

Polymeric amine membrane materials for carbon dioxide (CO2)/methane (CH4) separation

“…Moroever, the amines were compatabilie with polyethersulfone and did not develop any amine-rich phase in the membranes confirmed by the field emission scanning electron microscopy micrographs in Figure 3. The amines were diffused homogeneously through the polyethersulfone membranes and worked as a carrier to provide higher gas permeability, which was more preferable rather than the higher selectivity for practical CO 2 capture [28,29].…”