Abstract: Polymer membranes are used for a variety of commercial gas separation applications, such as oxygen or nitrogen separation from air (i.e. separation O2/N2) or natural gas treatment and biogas upgrading (i.e. separation CO2/CH4) and others. In the search for membrane materials with increased performance and a better combination of selectivity and permeability, Polymers of Intrinsic Microporosity (PIMs) have been at the centre of the attention during the last decade and a half. Since the introduction of PIM-1 1, numerous other PIMs have been developed, with different functional groups2, contortion sites3 and entirely new backbone structures4 (Fig. 1). They all have in common a rigid and contorted structure, which is responsible for the high free volume and the high permeability of PIMs. A commonly used performance indicator for novel polymers is the position in the Robeson diagram, correlating the usually ideal selectivity of a gas pair and the pure gas permeability. PIM-1 1Amine-PIM-1 2PIM-SBF 3PIM-EA-TB 4 Figure 1. Typical examples of polymers of intrinsic microporosity. This paper will show for a number of PIMs how the mixed gas permeation may deviate from ideal behaviour, depending on structural features. The mixed gas permeation data are determined with a novel permeation setup, based on online mass-spectrometric analysis of the permeate composition. This unique feature, which allows constant monitoring of the permeation transient even with gas mixtures, enables the calculation of the diffusion coefficients of individual components in a gas mixture by simultaneous measurement of their time lags. The implications for real gas separation processes will be discussed. 1P.M. Budd, B.S. Ghanem, S. Makhseed, N.B. McKeown, K.J. Msayib, C.E. Tattershall, Chem. Commun.. 2004, 10, 230. 2C.R. Mason, L. Maynard-Atem, K.W.J. Heard, B. Satilmis, P.M. Budd, K. Friess, M. Lan?, P. Bernardo, G. Clarizia, J.C. Jansen, Macromolecules. 2014, 47, 1021. 3.C.G. Bezzu, M. Carta, A. Tonkins, J.C. Jansen, P. Bernardo, F. Bazzarelli and N.B. McKeown, Advanced Materials, 2012, 24, 5930. 4.M. Carta, M. Croad, R. Malpass-Evans, J. C. Jansen, P. Bernardo, G. Clarizia, K. Friess, M. Lanc and N. B. McKeown, Advanced Materials, 2014, 26, 3526.
PURE VERSUS MIXED GAS PERMEATION IN POLYMERS OF INTRINSIC MICROPOROSITY (PIMS)
J C Jansen;M Monteleone;A Fuoco;
2018
Abstract
Abstract: Polymer membranes are used for a variety of commercial gas separation applications, such as oxygen or nitrogen separation from air (i.e. separation O2/N2) or natural gas treatment and biogas upgrading (i.e. separation CO2/CH4) and others. In the search for membrane materials with increased performance and a better combination of selectivity and permeability, Polymers of Intrinsic Microporosity (PIMs) have been at the centre of the attention during the last decade and a half. Since the introduction of PIM-1 1, numerous other PIMs have been developed, with different functional groups2, contortion sites3 and entirely new backbone structures4 (Fig. 1). They all have in common a rigid and contorted structure, which is responsible for the high free volume and the high permeability of PIMs. A commonly used performance indicator for novel polymers is the position in the Robeson diagram, correlating the usually ideal selectivity of a gas pair and the pure gas permeability. PIM-1 1Amine-PIM-1 2PIM-SBF 3PIM-EA-TB 4 Figure 1. Typical examples of polymers of intrinsic microporosity. This paper will show for a number of PIMs how the mixed gas permeation may deviate from ideal behaviour, depending on structural features. The mixed gas permeation data are determined with a novel permeation setup, based on online mass-spectrometric analysis of the permeate composition. This unique feature, which allows constant monitoring of the permeation transient even with gas mixtures, enables the calculation of the diffusion coefficients of individual components in a gas mixture by simultaneous measurement of their time lags. The implications for real gas separation processes will be discussed. 1P.M. Budd, B.S. Ghanem, S. Makhseed, N.B. McKeown, K.J. Msayib, C.E. Tattershall, Chem. Commun.. 2004, 10, 230. 2C.R. Mason, L. Maynard-Atem, K.W.J. Heard, B. Satilmis, P.M. Budd, K. Friess, M. Lan?, P. Bernardo, G. Clarizia, J.C. Jansen, Macromolecules. 2014, 47, 1021. 3.C.G. Bezzu, M. Carta, A. Tonkins, J.C. Jansen, P. Bernardo, F. Bazzarelli and N.B. McKeown, Advanced Materials, 2012, 24, 5930. 4.M. Carta, M. Croad, R. Malpass-Evans, J. C. Jansen, P. Bernardo, G. Clarizia, K. Friess, M. Lanc and N. B. McKeown, Advanced Materials, 2014, 26, 3526.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
