Modification of poly(vinyl alcohol) membranes using sulfur-succinic acid and its application to pervaporation separation of water-alcohol mixtures

Abstract

For the purposes of the water-selective membrane material development for pervaporation separation, we crosslinked poly(vinyl alcohol) (PVA) with sulfursuccinic acid (SSA), which contains {SO 3 OH, by heat treatment and investigated the effect of the crosslinking density on the separation of water-alcohol mixtures by pervaporation technique. The crosslinking reaction between PVA and SSA was characterized through Fourier transform infrared spectroscopy and differential scanning calorimetry tests by varying the amount of the crosslinking agent, the reaction temperature, and the swelling measurements of each pure component. The separation performance of the water-methanol mixture is not good due to the existence of sulfonic acid, hydrophilic group, in the crosslinking agent. However, for the water-ethanol mixture, the flux of 0.291 kg/m 2 h and the separation factor of 171 were obtained at 70ЊC when PVAcrosslinked membrane containing 7 wt % SSA was used. The same membrane also showed flux of 0.206 kg/m 2 h and a separation factor of 1969 at the same operating temperature.

Esterification of acetic acid by isoamylic alcohol over catalytic membranes of poly(vinyl alcohol) containing sulfonic acid groups

“…This is probably due to the decrease of the free volume, even though the membrane contains more hydrophilic functional groups, as observed by other authors [36]. In the case of the PVA10/SAy membranes, the decrease of the free volume is likely to be due to hydrogen bridging between the sulfonic OH groups and the PVA OH groups.…”

Polyvinyl Alcohol-Cellulose Acetate Composite Reverses Osmosis Membranes: I. Synthesis and Characterization

“…As notified, increasing CA concentration should both the swelling % and decreasing gelation % [37]. Accordingly, and as observed from the results, the suitable CA concentration for the purpose of RO desalination process is CA at 25 wt % of the polymer concentration.…”

Surface Modification of Poly(vinyl alcohol) Fibers

“…However, whilst covalent bonds (acetal rings) enhance thermal stability, they disrupt the crystallinity. [11] Cationic and Anionic Modification PAA and PDMC were grafted from the surface of PVA fibers using a KPS/Na 2 S 2 O 3 redox initiating system. Grafting is commonly carried out in solution; there is very little information in literature on grafting in heterogeneous media for the modification of PVA fibers.…”