TY - JOUR
T1 - Hydrogen stable supported ionic liquid membranes with silver carriers
T2 - propylene and propane permeability and solubility
AU - Sanchez, Constanza Miguel
AU - Song, Tangqiumei
AU - Brennecke, Joan F.
AU - Freeman, Benny D.
N1 - Funding Information:
This paper is based upon work supported in part by the National Science Foundation under Cooperative Agreement No. EEC-1647722. The research was also supported by the Robert A. Welch Foundation (grant No. F-1945-20180324) and the Cockrell School of Engineering at the University of Texas at Austin.
Publisher Copyright:
Copyright © 2019 American Chemical Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/23
Y1 - 2020/10/23
N2 - Pure gas permeabilities of propylene and propane through ionic liquids supported on porous alumina membranes were determined as a function of silver salt concentration from 0 to 1 M and feed pressure from 0.15 to 2.0 bar at 35 °C. Two ionic liquids were tested: 1-hexyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ([hmmim][Tf2N]) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([hmim][Tf2N]). Propylene permeability increased with increasing silver content due to facilitated transport, but it decreased with increasing feed pressure. Permeability selectivity exhibited a nonlinear upward trend with silver concentration, indicating the formation of higher order silver-propylene complexes at higher silver concentrations. Solubility measurements were performed gravimetrically, which allowed for simultaneous determination of diffusion coefficients. Permeabilities were hindered by low diffusion coefficients due to increasing viscosity with increasing silver content. The most surprising result was the stability of the membrane after exposure to hydrogen gas, suggesting that the ionic liquids significantly slowed silver ion reduction.
AB - Pure gas permeabilities of propylene and propane through ionic liquids supported on porous alumina membranes were determined as a function of silver salt concentration from 0 to 1 M and feed pressure from 0.15 to 2.0 bar at 35 °C. Two ionic liquids were tested: 1-hexyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ([hmmim][Tf2N]) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([hmim][Tf2N]). Propylene permeability increased with increasing silver content due to facilitated transport, but it decreased with increasing feed pressure. Permeability selectivity exhibited a nonlinear upward trend with silver concentration, indicating the formation of higher order silver-propylene complexes at higher silver concentrations. Solubility measurements were performed gravimetrically, which allowed for simultaneous determination of diffusion coefficients. Permeabilities were hindered by low diffusion coefficients due to increasing viscosity with increasing silver content. The most surprising result was the stability of the membrane after exposure to hydrogen gas, suggesting that the ionic liquids significantly slowed silver ion reduction.
UR - https://www.scopus.com/pages/publications/85074700057
U2 - 10.1021/acs.iecr.9b04886
DO - 10.1021/acs.iecr.9b04886
M3 - Article
AN - SCOPUS:85074700057
SN - 0888-5885
VL - 59
SP - 5362
EP - 5370
JO - Industrial & Engineering Chemistry Research
JF - Industrial & Engineering Chemistry Research
IS - 12
ER -