Pervaporation separation of water–isopropyl alcohol mixture by PVA/LiBr membrane

Abstract

Hydrophilic polyvinyl alcohol membranes, modified by lithium bromide, were prepared with glutaraldehyde as a crosslinking reagent. The membranes were investigated for the pervaporation dehydration of a water–isopropyl systems. The effect of the feed temperature on permeation flux and membrane selectivity was studied. The characterization of modified membranes was performed using Fourier transform infrared spectroscopy (FT‐IR), differential scanning calorimeter (DSC) and X‐ray diffraction. It was observed that the crystallinity of membranes increased as lithium bromide was added to the polymer. High performance liquid chromatography (HPLC) was used to analyze water content and isopropyl alcohol in the feed and permeate samples The pervaporation tests also confirmed an enhancement in water permeability through adding LiBr to the polymer, because of the high hydrophilic properties of this salt. According to pervaporation experiments conducted at 50°C, the water flux increased from 0.1049 kg/ m2 hr to 0.1114 kg/ m2 hr as 0.5 wt% of LiBr was added to the polymer matrix. Furthermore, an addition of 1 wt% of LiBr compared to homogeneous PVA membrane increased selectivity from 76 to 779. POLYM. ENG. SCI., 59:E101–E111, 2019. © 2018 Society of Plastics Engineers

Pervaporative poly(vinyl alcohol)/H‐β zeolite mixed matrix membranes for dewatering C2–C3 alcohols

“…The dewatering performances of the PVA/zeolite MMMs for water‐alcohol separation are compared with those reported in the literature. Table 8 presents the NPA dewatering performances of various membranes 43,46,48–54 and Table 9 compares the IPA dehydration performances for different PVA‐based membranes developed since 2015 12–15,22,28,55–64 . As seen from Tables 8 and 9, the H‐20 MMM developed here has led to a separation factor of 1391 and 1711 for NPA/water and IPA/water solutions, respectively, when dewatering 90 wt% alcohol aqueous solution at 60°C, which are considerably larger than the other polymer‐based membranes under more or less similar dehydration conditions.…”

Fabrication and characterization of novel polyester thin‐film nanocomposite membranes achieved by functionalized SiO2 nanoparticles for gas separation

“…In the following, the reasons for such changes are investigated, stating the diffusion and solubility coefficients. Moreover, the increase in the free space enclosed by the polymer provides more suitable space for smaller gases to pass resulting in more increase in the permeability of smaller molecules [30][31][32]. As shown in Figs.…”

Antifouling membrane based on sodium alginate coated polyamide thin film composite for desalination of brackish water

“…The obtained membrane was cross‐linked in a bath containing 5 mL GA, 0.1 M of 1 mL HCl and 4 mL of distilled water in 90 mL of IPA for about 3 hours. [ 19,25,27 ] Finally, a four‐layered structure of SA coated PA‐TFC membrane (SA/PA‐TFC) was synthesized and evaluated for experimental studies.…”