Measurements of diffusion through a zeolite membrane using isotopic-transient pervaporation

Modeling transient permeation of polar organic mixtures through a MFI zeolite membrane using the Maxwell–Stefan equations

“…Ludox AS 40 (silica sol) was the Si source, TPAOH (tetra-propyl ammonium hydroxide) was the template, and 2-propanol was a solvent. More details on membrane preparation have been published previously [17]. A second membrane (M2), prepared by the same method on a different support (stainless steel, 0.5-m pores, Mott Corporation), was analyzed by SEM and electron probe microanalysis (EPMA) to determine its thickness and Si/Ge ratio.…”

“…The apparatus used for isotopic-transient pervaporation is similar to the system described previously [17]. The membrane tube was sealed in a stainless steel module using Teflon o-rings.…”

“…Normalized responses of these cracking fractions overlapped with those of the parent masses. Normalized responses are presented since the responses do not depend on the amount of isotope added [17].…”

“…Diffusion of mixtures with strong molecular interactions has been studied in polymeric membranes [15,16], although few such studies were done on zeolite membranes [17,18]. Plessis et al [15] studied the permeation of a series of structurally related compounds through a PDMS membrane saturated with toluene and octanol.…”

Desalination of aqueous solutions by LTA and MFI zeolite membranes using pervaporation method

“…These inorganic materials have been used extensively as catalysts and adsorbents. More recently, continuous polycrystalline zeolite layers have been deposited on porous supports and used as zeolite membranes (Bowen et al, 2004). A zeolite membrane is a porous layer that can separate mixtures by adsorption and diffusion differences and, in some cases, by molecular sieving.…”