Recent Advances in Gas Separation by Microporous Ceramic Membranes pdf

[...]... financial assistance and to all our partners in several microporous membrane research projects funded by the European Commission and especially to Steve Tennison from Mast International Ltd Nick Kanellopoulos This Page Intentionally Left Blank RecentAdvancesin Gas Separationby MicroporousCeramicMembranes N.K Kanellopoulos(Editor) 2000 ElsevierScienceB.V All rightsreserved MEMBRANE CHARACTERISATION BY. .. task Over the recent years, significant progress has been made with respect to the development of novel microporous asymmetric membranes, mainly involving modification by means of deposition of additional material within the pores of the substrates Most state-of-the-art technologies aiming in the development of microporous ceramic membrane are presented in chapters 3.1, 3.2 and 3.3 These include several... separating layer Combining xii sorption techniques, scattering and differential permeability techniques, the characterization of the complex pore structure of the microporous layer, interpenetrated by a network of larger pores can be obtained These are analytically presented in chapter 1.1 The study of the physical state of sorbed phase confined in micropores can be determined by nondestructive scattering... of separation by microporous membranes For low temperatures, the "reverse molecular sieving" is considered as a very efficient mode of separation in which preferential sorption of heavy gas mixture components results in the exclusion of the light components of the gas mixtures and the permeation of the heavy components through the membrane The idea of the reverse sieving was initially introduced during... through the larger pore network interpenetrating the network of micropores in the separating layer In chapter 4.1 some of the most promising applications for the "low temperature reverse molecular sieving" mode of separation are presented, namely the recovery of paraffins and olefins from fluid catalytic cracking off gas along with the carbon dioxide removal from natural gas These are two major processes... diameter iii Asymmetric gas- separating carbon membranes obtained through carbonisation of a polymer resin precursor and subsequent activation (1) These membranes have a microporous carbon skin on top of a macroporous carbon substrate The pore diameter of the microporous material appears to be in the 12-15 A range, while microporosity is about 38% iv Silicalite-1 membranes prepared by in situ hydrothermal... nondestructive scattering techniques The recent advances of in situ X-Ray Diffraction (XRD) are presented in chaptem 1.2, whereas the principles of Small Angle Scattering techniques are outlined in chapter 1.3 along with recent developments employing the contrast matching technique Several chapters of the first section are dedicated to the study of the diffusion processes in the micropores "Microscopic" methods... crystallisation of the zeolite inside the pores of ct-A1203 macroporous disk-shaped supports Syntheses were performed by dissolving pyrogenic silica (Aerosil 380, Degussa) in aqueous solutions of tetrapropylammonium hydroxide (templating agent) After ageing the mixtures were heated with the support in Teflon lined stainless steel autoclaves Finally, the organic template was removed by calcination (2) 2 DYNAMIC... often arises in practice is that the microporous structure contains paths that allow certain probe molecules j to enter the one side of the membrane but not to exit from the other Subsequent degassing may then become rather cumbersome and in situ burning of the probe molecules is, in general, not possible as the membranes are usually sealed and held in place with the help of an organic resin 2.3 Small... techniques are combined In the following, we briefly survey three independent methods of membrane characterisation (adsorption, permeability, small-angle scattering (SAS) of x-rays and neutrons) and two significant combinations of them, permeability in conjunction with adsorption and adsorption in conjunction with SAS, with special emphasis on the type of information obtainable in each case Additionally, . alt="" RECENT ADVANCES IN GAS SEPARATION BY MICROPOROUS CERAMIC MEMBRANES This Page Intentionally Left Blank Membrane Science and Technology Series, 6 RECENT ADVANCES IN GAS SEPARATION BY MICROPOROUS. Cataloging -in- Publication Data Recent advances in gas separation by microporous ceramic membranes / edited by N.K. Kanellopoulos Ist ed. p. em. (Membrane science and technology series ; 6) Includes. Mast International Ltd. Nick Kanellopoulos This Page Intentionally Left Blank Recent Advances in Gas Separation by Microporous Ceramic Membranes N.K. Kanellopoulos (Editor) 2000 Elsevier Science