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TL;DR: In this paper, a numerical analysis was performed to investigate the removal behavior of carbon dioxide using a hollow fiber membrane contactor in which an aqueous potassium carbonate solution flows as an absorbent.

TL;DR: In this paper, a thin-film composite (TFC) membrane with a polysulfone (PSf) support layer comprising an ultrathin polydopamine/graphene oxide (PDA/GO) interlayer was fabricated by phase inversion, self-polymerization, and interfacial polymerization to improve water permeability of the TFC membrane for forward osmosis (FO) application.

TL;DR: In this article, a multi-phase separation process with the use of room temperature ionic liquid (RTILs) and polymer was developed for the removal of acidic gases from crude natural gas.

TL;DR: In this article, a numerical model for the CO2 concentration profile in a fiber was developed, and the influence of its flux on the external mass transfer resistances, including gas and membrane, was simulated with this numerical model and compared with the experimental results.

Abstract: Water-swollen hydrogel (WSH) membranes for gas separation were prepared by the dip-coating of asymmetric porous polyetherimide (PEI) membrane supports with poly(vinyl alcohol) (PVA)–glutaraldehyde (GA), followed by the crosslinking of the active layer by a solution method. Crosslinked PVA/GA film of different blend compositions (PVA/GA = 1/0.04, 0.06, 0.08, 0.10, 0.12 mol %) were characterized by differential scanning calorimetry (DSC) and their water-swelling ratio. The swelling behavior of PVA/GA films of different blend compositions was dependent on the crosslinking density and chemical functional groups created by the reaction between PVA and GA, such as the acetal group, ether linkage, and unreacted pendent aldehydes in PVA. The permeation performances of the membranes swollen by the water vapor contained in a feed gas were investigated. The behavior of gas permeation through a WSH membrane was parallel to the swelling behavior of the PVA/GA film in water. The permeation rate of carbon dioxide through the WSH membranes was 105 (cm3 cm−2 s−1 cmHg) and a CO2/N2 separation factor was about 80 at room temperature. The effect of the additive (potassium bicarbonate, KHCO3) and catalyst (sodium arsenite, NaASO2) on the permeation of gases through these WSH membranes was also studied. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1785–1791, 2001