Aim of this work is the preparation and characterization of composite polymer membranes in flat and hollow fibre configuration for a potential use in CO2 separation from biogas and flue gas. For this purpose, an innovative polymer of the PIM family, the PIM-(H2)EA-TB is chosen. This material represents a simple modification of the shape-persistent ladder polymer comprising the Tröger's base (TB) and the ethanoanthracene unit (EA) as contortion site [1]. It is very interesting owing to its high permeability coupled with an enhanced molecular sieve behaviour, which is attributable to the combined rigidity of the bridged bicyclic TB and EA units [1]. Composite flat sheet membranes on a PDMS-coated polyacrylonitrile (PAN) support were prepared by controlled solvent evaporation, whereas composite hollow fibre membranes were prepared by dip coating or internal dynamic coating on PAN porous supports prepared ad hoc. For the flat sheet membranes, a CO2 permeance of 0.18 m3STP m-2 h-1 bar-1 combined to ideal selectivity values of 22.5 and 26.5 for CO2/CH4 and CO2/N2, respectively, were obtained. For coating the hollow fibres, different concentrations of PIM-(H2)EA-TB solution, in the range 2-6 wt.%, were used. The most promising results were achieved using the internal coating method with a dilute PIM-(H2)EA-TB solution (3 wt.%) in dichloromethane. Further investigations are in progress to maintain the gas separation properties of composite hollow fibre samples over time. Acknowledgements. PIM-(H2)EA-TB polymer was kindly provided by the group of Prof. Neil B. McKeown, University of Edinburgh (UK). Financial support was received from the Italian national research Project "MicroPERLA", grant PON01_01840, and from the EU's 7th Framework Programme, project "M4CO2", grant FP7-Energy-2013-1-608490. References [1] M. Carta, R. Malpass-Evans, M. Croad, Y. Rogan, J.C. Jansen, P. Bernardo, F. Bazzarelli, N.B. McKeown, An Efficient Polymer-based molecular sieve membranes for membrane gas separations, Science 339 (2013) 303-307.
Composite membranes based on PIM-(H2)EA-TB for gas separation
V Scorzafave;F Tasselli;P Bernardo;G Clarizia;JC Jansen
2014
Abstract
Aim of this work is the preparation and characterization of composite polymer membranes in flat and hollow fibre configuration for a potential use in CO2 separation from biogas and flue gas. For this purpose, an innovative polymer of the PIM family, the PIM-(H2)EA-TB is chosen. This material represents a simple modification of the shape-persistent ladder polymer comprising the Tröger's base (TB) and the ethanoanthracene unit (EA) as contortion site [1]. It is very interesting owing to its high permeability coupled with an enhanced molecular sieve behaviour, which is attributable to the combined rigidity of the bridged bicyclic TB and EA units [1]. Composite flat sheet membranes on a PDMS-coated polyacrylonitrile (PAN) support were prepared by controlled solvent evaporation, whereas composite hollow fibre membranes were prepared by dip coating or internal dynamic coating on PAN porous supports prepared ad hoc. For the flat sheet membranes, a CO2 permeance of 0.18 m3STP m-2 h-1 bar-1 combined to ideal selectivity values of 22.5 and 26.5 for CO2/CH4 and CO2/N2, respectively, were obtained. For coating the hollow fibres, different concentrations of PIM-(H2)EA-TB solution, in the range 2-6 wt.%, were used. The most promising results were achieved using the internal coating method with a dilute PIM-(H2)EA-TB solution (3 wt.%) in dichloromethane. Further investigations are in progress to maintain the gas separation properties of composite hollow fibre samples over time. Acknowledgements. PIM-(H2)EA-TB polymer was kindly provided by the group of Prof. Neil B. McKeown, University of Edinburgh (UK). Financial support was received from the Italian national research Project "MicroPERLA", grant PON01_01840, and from the EU's 7th Framework Programme, project "M4CO2", grant FP7-Energy-2013-1-608490. References [1] M. Carta, R. Malpass-Evans, M. Croad, Y. Rogan, J.C. Jansen, P. Bernardo, F. Bazzarelli, N.B. McKeown, An Efficient Polymer-based molecular sieve membranes for membrane gas separations, Science 339 (2013) 303-307.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
