Separation Technology,
H. Aasadi; O. Alizadeh; A. Ramazani; F. Dorosti
Abstract
The Mixed Matrix Membrane (MMM) concept consists of incorporating suitable polymers with inorganic or organic fillers. The majority of polymeric membranes maintain a trade-off between permeation and selectivity, which restricts their development in separation applications. In this paper, less reviewed ...
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The Mixed Matrix Membrane (MMM) concept consists of incorporating suitable polymers with inorganic or organic fillers. The majority of polymeric membranes maintain a trade-off between permeation and selectivity, which restricts their development in separation applications. In this paper, less reviewed challenges on development of MMMs, such as the preparation of mix-matrix resistant membranes for industrial gas separation applications, as well as the use of appropriate and compatible fillers for different types of polymers were discussed. The MMMs comprising Metal Organic Framework (MOF) fillers were extensively studied. The importance of MOFs includes finely tunable structures, excellent compatibility with polymer matrices, and molecular sieve action. MMMs are considered promising structures that combines the advantages of polymeric and inorganic membranes. They exhibit the potential to upgrade the separation performance of pure polymer membranes using filler materials, whereas the cost remains relatively lower than that of pure inorganic membranes. The development of novel filler materials makes a substantial contribution in terms of role-playing.
N. Sadeghi; O. Bakhtiari
Abstract
New promising generations of mixed matrix membranes (MMMs), which potentially have better separation performances than the neat polymeric membranes, are prepared by the incorporation of proper filler particles within polymeric matrices. However, some undesired phenomena like the void formation around ...
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New promising generations of mixed matrix membranes (MMMs), which potentially have better separation performances than the neat polymeric membranes, are prepared by the incorporation of proper filler particles within polymeric matrices. However, some undesired phenomena like the void formation around the filler particles limit this potential improvement. Having proper models is necessary to elucidate the impacts of this phenomenon on the MMMs’ separation performance. Different models have been developed but they are not able to predict the impact(s) of formed voids truly and their predicted void permeabilities are usually overestimated. In this study, the new parameter of the modified filler volume fraction considering the MMM swollen structure due to the formed voids around the filler particles, is employed along with the formed voids’ permeabilities correction factor, as ß, to modify the Maxwell, Bruggeman and Pal models for the MMMs’ permeability prediction. Absolute average relative errors (AAREs) of the modified models predicted that MMMs’ permeabilities or selectivities were considerably reduced to 3.16, 29.92, and 21.95 % from those of the Maxwell, Bruggeman, and Pal models as 31.33, 310.64, and 67.10 % respectively. Additionally, the optimum thicknesses of the formed voids around the filler particles rationally agree with the Knudsen flow concepts.