CO₂‐facilitated transport through poly(N‐vinyl‐γ‐sodium aminobutyrate‐co‐sodium acrylate)/polysulfone composite membranes

Abstract

Poly(N-vinyl-␥-sodium aminobutyrate-cosodium acrylate) (VSA-SA)/polysulfone (PS) composite membranes were prepared for the separation of CO 2 . VSA-SA contained secondary amines and carboxylate ions that could act as carriers for CO 2 . At 20°C and 1.06 atm of feed pressure, a VSA-SA/PS composite membrane displayed a pure CO 2 permeation rate of 6.12 ϫ 10 Ϫ6 cm 3 (STP)/cm 2 s cmHg and a CO 2 /CH 4 ideal selectivity of 524.5. In experiments with a mixed gas of 50 vol % CO 2 and 50 vol % CH 4 , at 20°C and 1.04 atm of feed pressure, the CO 2 permeation rate was 9.2 ϫ 10 Ϫ6 cm 3 (STP)/cm 2 s cmHg, and the selectivity of CO 2 /CH 4 was 46.8. Crosslinkages with metal ions were effective for increasing the selectivity. Both the selectivity of CO 2 over CH 4 and the CO 2 permeation rate had a maximum against the carrier concentration. The high CO 2 permeation rate originated from the facilitated transport mechanism, which was confirmed by Fourier transform infrared with attenuated total reflectance techniques. The performance of the membranes prepared in this work had good stability.

Role of Facilitated Transport Membranes and Composite Membranes for Efficient CO2 Capture – A Review

“…3 [49,51,52,[58][59][60][61][62][63][64][65] summarizes the results of various FSC membranes having different carriers. It can be seen that only a few membranes obtained high selectivity along with reasonably high CO 2 permeance values.…”

Polysulfone membranes for CO2/CH4 separation: State of the art

“…Wang et al reported an excellent CO 2 /CH 4 selectivity through poly(Nvinyl-γ-sodium aminobutyrate-co-sodium-acrylate) (VSA-SA)/PSf composite membrane [75]. VSA-SA has a secondary amine and a carboxylate ion, which can reversibly react with CO 2 and thus can be expected to act as carriers for CO 2 .…”

Gas permeation in amine functionalized silicon rubber membranes

“…For example, presence of amide/amine functionality enhanced permeation properties of acid gas CO 2 in poly(N-vinyl-␥-sodium aminobutyrate) [14] and polysulfone [15] than respective polymer without such functionality. This notion is not limited only to polymers, as aqueous solutions of alkanolamines are being used industrially as absorbents for acidic gases such as CO 2 and H 2 S since 1930 [15].…”