430321 Cellulose Triacetate Doped with Ionic Liquids for CO2/CH4 Separation

Thursday, November 12, 2015: 1:12 PM
155B (Salt Palace Convention Center)
Haiqing Lin1, Benjamin Lam2, Min Wei2, Shuangjiang Luo3 and Ruilan Guo3, (1)Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, (2)Dept. of Chemical and Biological Eng., University at Buffalo, The State University of New York, Buffalo, NY, (3)Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN

Polymeric membranes have been widely used for the removal of CO2 from natural gas.  It is a leading technology for offshore platform applications and is gaining more competitive advantages over conventional amine absorption for onshore applications.  The work horse membrane material for industrial CO2/CH4 separation is cellulose acetate/triacetate (CTA).  The more widely use of CTA is, however, limited by its high crystallinity, leading to low CO2 permeability.  The goal of this work is to reduce the crystallinity in CTA by doping with ionic liquids such as [emim](BF4) and [emim](DCA), to improve the CO2/CH4 separation properties.  Both ionic liquids have CO2/CH4 solubility selectivity higher than CTA.  In this project, we have prepared series of CTAs doped with various contents of [emim](BF4) or [emim](DCA).  The effect of ionic liquids on the crystal formation in CTAs was characterized using DSC and WAXD.  Doping of ionic liquids can reduce or completely inhibit the crystal formation in CTA, resulting in an increase in gas solubility and permeability.  The presentation will discuss the effect of the doping of ionic liquids on the physical properties of the blends, including morphology and pure-gas solubility, diffusivity and permeability.

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See more of this Session: Membranes for Gas Separations II
See more of this Group/Topical: Separations Division