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    A New Type of Composite Membrane PVA-NaY/PA-6 for Separation of Industrially Valuable Mixture Ethanol/EthylTert-Butyl Ether by Pervaporation

    Year: 2020

    Journal: Materials, Volume 13, SEP

    Authors: Knozowska, Katarzyna; Kujawa, Joanna; Lagzdins, Renars; Figoli, Alberto; Kujawski, Wojciech

    Organizations: Preludium 13 grant from The National Science Center (NSC) [2017/25/N/ST5/01097]; NSCMinistry of Science and Technology, Taiwan [2018/28/T/ST5/00411]

    Keywords: preparation and characterization of composite membranes; NaY zeolite; poly(vinyl alcohol); poly(amide-6); organic-organic pervaporation; ethanol; ethyltert-butyl ether (EtOH; ETBE) mixture

    Pervaporation is a membrane technique used to separate azeotropic and close boiling solvents. Heterogenous PVA composite membranes with NaY zeolite supported on polyamide-6 were fabricated and utilized in organic-organic pervaporation. The efficiency of prepared membranes was evaluated in the separation of ethanol/ethyltert-butyl ether (EtOH/ETBE) using separation factor (beta) and the thickness normalized pervaporation separation index (PSIN). Implementation of the fringe projection phase-shifting method allowed to the determined contact angle corrected by roughness. The influence of the presence of water traces in the feed on the overall separation efficiency was also discussed using the enrichment factor for water (EFwater). The incorporation of NaY into PVA matrix increases surface roughness and hydrophilicity of the composite membrane. It was found that membranes selectively transport ethanol from the binary EtOH/ETBE mixture. The values of beta(2.3) andPSI(N)(288 mu m g m(-2)h(-1)) for PVA-NaY/PA6 membrane were improved by 143% and 160% in comparison to the values for the pristine PVA/PA6 membrane. It was found that membranes showedEF(water)> 1, thus revealing the preferential transport of water molecules across membranes. These results are also significant for the design of membranes for the removal of water excess from the mixtures of organic solvents.
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