PVAm–PIP/PS Composite Membrane with High Performance for CO₂/N₂ Separation

Abstract

in Wiley Online Library (wileyonlinelibrary.com).Polyvinylamine (PVAm) was modified using a cross-linking agent containing carriers piperazine (PIP). Attenuated total reflectance fourier transform infrared, elemental analyzer, and X-ray diffraction were used to characterize the PIP-modified PVAm. The PVAm-PIP/polysulfone (PS) composite membrane was developed by coating PVAm-PIP mixed solutions with different mass ratios of PIP/PVAm (m PIP /m PVAm ) on the PS ultrafiltration membrane. The effects of m PIP /m PVAm (from 0.715 to 2.860) in the coating solutions and wet coating thickness on the gas performance of the PVAm-PIP/PS composite membrane were investigated. The PVAm-PIP/PS composite membrane prepared showed higher performance than other membranes reported in the literature due to the large increase of the introducing carrier concentration and low crystallinity. Moreover, the separation performance stability of the PVAm-PIP/PS composite membrane was investigated and no deterioration in the membrane permselectivity was observed. Finally, the economic evaluation of the membrane with the highest performance prepared was carried out. V V C 2012 American Institute of Chemical Engineers AIChE J, 59: 215-228, 2013 P CO2 -CO 2 partial pressure of the feed gas (MPa); P-feed gas pressure (MPa). The prepared conditions of PVAm-PIP/PS composite membrane: the m PIP / m PVAm in the coating solution is 1.430; the wet coating thickness of the PVAm-PIP/PS a composite membrane is 30 lm; the wet coating thickness of the PVAm-PIP/PS b composite membranes is 50 lm. The prepared condition of PVAm-EDA/PS composite membrane: the m EDA /m PVAm in the coating solution is 3; wet coating thickness is 50 lm.

Preparation and characterization of small molecular amine modified PVAm membranes for CO2/H2 separation

“…2 [14,24]. It has been deduced that the intermolecular hydrogen bonds in the PVAm-PIP film formed between the secondary amine group of PIP and the primary amine group in PVAm [24], and the intermolecular hydrogen bonds in the PVAm-EDA film formed between primary amine group of EDA and the amide group or primary amine group in PVAm [14].…”

“…2 [14,24]. It has been deduced that the intermolecular hydrogen bonds in the PVAm-PIP film formed between the secondary amine group of PIP and the primary amine group in PVAm [24], and the intermolecular hydrogen bonds in the PVAm-EDA film formed between primary amine group of EDA and the amide group or primary amine group in PVAm [14]. Moreover, based on the literature [14], the XPS analyses of the PVAm-EDA/PS membrane also indicated that the intermolecular hydrogen bonds in the PVAm-EDA/PS membrane formed between the primary amine groups of EDA and the amide groups in PVAm.…”

A Highly Permeable Aligned Montmorillonite Mixed‐Matrix Membrane for CO2 Separation

“…Mixed-gas separation of CO 2 with the AMT/PSf membrane compared with that of RMT/PSf and other polymeric and mixed-matrix membranes reported in the literature, tested using dry gases. [13][14][15][16][17][18][19][20][21] Ü Ü These are not the final page numbers! a much higher CO 2 /H 2 separation performance in particular (see the Supporting Information).…”

Recent developments in membranes for efficient hydrogen purification

“…These contaminants could possibly affect the performance of facilitated transport membranes via degrading carriers, competitive sorption with CO 2 or competitive reaction with CO 2 . Therefore, effects of various potential impurities on facilitated transport membranes containing amino groups and carbonate groups have been widely investigated by several research groups [284,291,[305][306][307][308]. According to these studies, there was a negative effect of minor contaminants on membrane performances observed.…”

“…In recent years, our group introduced a novel method that various amino group-containing small molecules were used to modify amino group-rich polymers via hydrogen-bonding crosslinking, which not only could achieve the optimization of membrane material structures at multiple levels, but also could increase the carrier concentration in the membranes [283][284][285][286][287]. Following this strategy, ethylenediamine (EDA), piperazine (PIP), monoethanolamine (MEA) and methylcarbamate (MC) were used as modifiers to incorporate into the PVAm matrix, and the formed hydrogen-bonding crosslinked networks were illustrated in Fig.…”