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Mater Sci Eng C Mater Biol Appl. 2019 Sep;102:524-535. doi: 10.1016/j.msec.2019.04.057. Epub 2019 Apr 23.

Ionic liquid tethered PEG-based polyurethane-siloxane membranes for efficient CO2/CH4 separation.

Author information

1
Faculty of Petrochemicals, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran. Electronic address: a.ghadimi@ippi.ac.ir.
2
Faculty of Chemistry, Kharazmi University, Tehran, Iran. Electronic address: r.gharibi@khu.ac.ir.
3
Department of Polyurethane, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran.
4
Department of Biomaterials, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran.

Abstract

This study introduces a new polyethylene glycol (PEG) based polyurethane-siloxane membrane containing a quaternary ammonium ionic liquid for CO2/CH4 separation. The designed ionic liquid was prepared in two steps: (i) (3-chloropropyl)triethoxysilane (CPS) and N,N-dimethylpropyl amine (NDPA) were reacted with each other to form the methoxysilane-functionalized quaternary ammonium component, then (ii) chloride ion (Cl-) of the product was exchanged with tetrafluoroborate ion (BF4-). The resulting compound, a reactive methoxysilane-functionalized ionic liquid (Si-IL) was chemically anchored to the polymer backbone through the sol-gel hydrolysis and condensation reaction. Based on the permeation tests, the IL containing PEG-based polyurethane-siloxane membranes at different concentration of Si-IL (XSi-PPUIL) were found to be potential candidates for CO2 removal from CH4. For instance, the CO2/CH4 selectivity of XSi-PPUIL membranes with the Si-IL content of 10 wt% was 3.3-fold greater than the Si-IL free membranes; while, the CO2 permeability for IL tethered membranes was 9.7% higher than the corresponding IL-free membrane.

KEYWORDS:

CO(2) separation; Ionic liquid; PEG-based membrane; Polyurethane-siloxane

PMID:
31147023
DOI:
10.1016/j.msec.2019.04.057

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