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Title: Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures

Surface wettability-tailored porous ceramic/metallic membranes (in the tubular and planar disc form) were prepared and studied for both vapor-phase separation and liquid pervaporative separations of water-ethanol mixtures. Superhydrophobic nanoceramic membranes demonstrated more selective permeation of ethanol (relative to water) by cross-flow pervaporation of liquid ethanol–water mixture (10 wt % ethanol feed at 80 °C). In addition, both superhydrophilic and superhydrophobic membranes were tested for the vapor-phase separations of water–ethanol mixtures. Porous inorganic membranes having relatively large nanopores (up to 8-nm) demonstrated good separation selectivity with higher permeation flux through a non-molecular-sieving mechanism. Due to surface-enhanced separation selectivity, larger nanopore-sized membranes (~5–100 nm) can be employed for both pervaporation and vapor phase separations to obtain higher selectivity (e.g., permselectivity for ethanol of 13.9 during pervaporation and a vapor phase separation factor of 1.6), with higher flux due to larger nanopores than the traditional size-exclusion membranes (e.g., inorganic zeolite-based membranes having sub-nanometer pores). The prepared superhydrophobic porous inorganic membranes in this work showed good thermal stability (i.e., the large contact angle remains the same after 300 °C for 4 h) and chemical stability to ethanol, while the silica-textured superhydrophilic surfaced membranes can tolerate even higher temperatures. These surface-engineered metallic/ceramic nanoporous membranes shouldmore » have better high-temperature tolerance for hot vapor processing than those reported for polymeric membranes.« less
Authors:
 [1] ;  [2] ;  [1] ; ORCiD logo [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
NREL/JA-5900-72700
Journal ID: ISSN 2077-0375; MBSEB6
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Membranes
Additional Journal Information:
Journal Volume: 8; Journal Issue: 4; Journal ID: ISSN 2077-0375
Publisher:
MDPI
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; inorganic membranes; nanoporous membranes; superhydrophobic; superhydrophilic; ethanol separations; dewatering; dehydration
OSTI Identifier:
1480681

Hu, Michael, Engtrakul, Chaiwat, Bischoff, Brian, Lu, Mi, and Alemseghed, Mussie. Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures. United States: N. p., Web. doi:10.3390/membranes8040095.
Hu, Michael, Engtrakul, Chaiwat, Bischoff, Brian, Lu, Mi, & Alemseghed, Mussie. Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures. United States. doi:10.3390/membranes8040095.
Hu, Michael, Engtrakul, Chaiwat, Bischoff, Brian, Lu, Mi, and Alemseghed, Mussie. 2018. "Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures". United States. doi:10.3390/membranes8040095. https://www.osti.gov/servlets/purl/1480681.
@article{osti_1480681,
title = {Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures},
author = {Hu, Michael and Engtrakul, Chaiwat and Bischoff, Brian and Lu, Mi and Alemseghed, Mussie},
abstractNote = {Surface wettability-tailored porous ceramic/metallic membranes (in the tubular and planar disc form) were prepared and studied for both vapor-phase separation and liquid pervaporative separations of water-ethanol mixtures. Superhydrophobic nanoceramic membranes demonstrated more selective permeation of ethanol (relative to water) by cross-flow pervaporation of liquid ethanol–water mixture (10 wt % ethanol feed at 80 °C). In addition, both superhydrophilic and superhydrophobic membranes were tested for the vapor-phase separations of water–ethanol mixtures. Porous inorganic membranes having relatively large nanopores (up to 8-nm) demonstrated good separation selectivity with higher permeation flux through a non-molecular-sieving mechanism. Due to surface-enhanced separation selectivity, larger nanopore-sized membranes (~5–100 nm) can be employed for both pervaporation and vapor phase separations to obtain higher selectivity (e.g., permselectivity for ethanol of 13.9 during pervaporation and a vapor phase separation factor of 1.6), with higher flux due to larger nanopores than the traditional size-exclusion membranes (e.g., inorganic zeolite-based membranes having sub-nanometer pores). The prepared superhydrophobic porous inorganic membranes in this work showed good thermal stability (i.e., the large contact angle remains the same after 300 °C for 4 h) and chemical stability to ethanol, while the silica-textured superhydrophilic surfaced membranes can tolerate even higher temperatures. These surface-engineered metallic/ceramic nanoporous membranes should have better high-temperature tolerance for hot vapor processing than those reported for polymeric membranes.},
doi = {10.3390/membranes8040095},
journal = {Membranes},
number = 4,
volume = 8,
place = {United States},
year = {2018},
month = {10}
}

Works referenced in this record:

Preparation of zeolite MFI membranes on alumina hollow fibers with high flux for pervaporation
journal, August 2011

Membrane separation process�Pervaporation through zeolite membrane
journal, November 2008
  • Wee, Shin-Ling; Tye, Ching-Thian; Bhatia, Subhash
  • Separation and Purification Technology, Vol. 63, Issue 3, p. 500-516
  • DOI: 10.1016/j.seppur.2008.07.010