Carbon membranes for gas separation: Developmental studies

Gas permselectivity of carbonized polypyrrolone membrane

“…Although carbon molecular sieves produced from the pyrolysis of polymeric materials have been studied extensively in adsorption applications, membrane application of carbon molecular sieves does not satisfactorily exhibit a 'molecular sieve effect' because the measured gas selectivities are very low, sometimes lower than those of the original polymer membranes, due to the presence of cracks or large pores causing gas leaks. 2,3 Here, we report gas permeability and permselectivity through a carbonized polypyrrolone membrane. Recently there have been several reports [4][5][6][7] that carbon molecular sieve membranes produced from polyimide precursors have higher separation performance than those of conventional polymer membranes.…”

Carbon molecular sieve membranes prepared from porous fiber precursor

“…The UF membranes have no intrinsic gas separation properties and show gas permeabilities up to 10 5 GPU 1 for N 2 . Preparation of CMS membranes from porous precursors has been reported [13], but to obtain good separation values the precursor was coated before pyrolysis. We applied no coatings to our fibers before or after the pyrolysis.…”

Elaboration and Pore Size Control of Macro Porous Carbonized Material by Pyrolysis of Resin/Carbon Composite

“…These were used in purification of natural water, in the metallurgical industry for removal of SiO 2 from an HCl pickling bath, in the machining of aluminium for removal of very fine aluminium particles from air and in the production of TiO 2 for removal of TiO 2 from effluents [19]. Carbon microfiltration membranes were also used as support for gas separation carbon membranes [20].…”