The aim of this work is the preparation and characterization of composite polymer membranes in flat and hollow fibre configuration, for potential use in CO2 separation from biogas and flue gas. For this purpose, an innovative polymer of the PIM family, 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 reported previously [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. Composite flat sheet membranes on a PDMS-coated polyacrylonitrile (PAN) support were prepared by controlled solvent evaporation, whereas composite hollow fibre (HF) membranes were prepared by dip coating or by internal dynamic coating on PAN porous supports prepared ad hoc. Flat sheet membranes with a CO2 permeance of 0.18 m3STP m-2 h-1 bar-1 and ideal selectivity values of 22.5 and 26.5 for CO2/CH4 and CO2/N2, respectively, were obtained. For the coating process of the hollow fibres, different concentrations of PIM-(H2)EA-TB in chloroform or dichloromethane, in the range of 2-6 wt.%, were used. The most promising results were achieved using the internal coating method with a 3 wt.% PIM-(H2)EA-TB solution in dichloromethane. The PAN HFs were also treated with aqueous NaOH solutions in order to oxidize the cyano groups to the carboxylic acid. The COOH groups should improve the adhesion of PIM-(H2)EA-TB onto the PAN HF supports via interaction with the ternary amines of the TB unit. The membrane performance properties strongly depends on the preparation conditions and on the type of solvent used. This paper will report a study of the transport properties of PIM-(H2)EA-TB membranes via experimental and computational analysis. Acknowledgements. 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
Scorzafave V;Tasselli F;Clarizia G;Bernardo P;Tocci E;Borgogno A;Jansen J C
2015
Abstract
The aim of this work is the preparation and characterization of composite polymer membranes in flat and hollow fibre configuration, for potential use in CO2 separation from biogas and flue gas. For this purpose, an innovative polymer of the PIM family, 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 reported previously [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. Composite flat sheet membranes on a PDMS-coated polyacrylonitrile (PAN) support were prepared by controlled solvent evaporation, whereas composite hollow fibre (HF) membranes were prepared by dip coating or by internal dynamic coating on PAN porous supports prepared ad hoc. Flat sheet membranes with a CO2 permeance of 0.18 m3STP m-2 h-1 bar-1 and ideal selectivity values of 22.5 and 26.5 for CO2/CH4 and CO2/N2, respectively, were obtained. For the coating process of the hollow fibres, different concentrations of PIM-(H2)EA-TB in chloroform or dichloromethane, in the range of 2-6 wt.%, were used. The most promising results were achieved using the internal coating method with a 3 wt.% PIM-(H2)EA-TB solution in dichloromethane. The PAN HFs were also treated with aqueous NaOH solutions in order to oxidize the cyano groups to the carboxylic acid. The COOH groups should improve the adhesion of PIM-(H2)EA-TB onto the PAN HF supports via interaction with the ternary amines of the TB unit. The membrane performance properties strongly depends on the preparation conditions and on the type of solvent used. This paper will report a study of the transport properties of PIM-(H2)EA-TB membranes via experimental and computational analysis. Acknowledgements. 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.
