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Title:
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HYBRID SILICA NANOFILTRATION MEMBRANES WITH LOW MWCO VALUES
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Author(s):
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Published by:
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Publication date:
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ECN
Biomass & Energy Efficiency
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12-12-2014
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ECN report number:
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Document type:
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ECN-M--14-070
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Conference Paper
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Number of pages:
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Full text:
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8
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Download PDF
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Abstract:
In industrial processes there is a need for solvent stable nanofiltration membranes with a molecular weight cut-off value of only a few hundred Daltons. By using these membranes important process improvements and energy savings are possible as compared to e.g. thermal separation processes. Developments nowadays are focussing towards (1) stabilising polymeric membranes, (2) using ceramic and modified ceramic materials, and towards (3) applying hybrid membranes. Because of their unique solvent resistance, we have selected hybrid silica membrane materials as a basis for developing solvent stable nanofiltration membranes that meet the demands as set by industry.
Here we will report on successfully tuning the pore size of the final membrane layer by using a hybrid silica precursor (BTESE, bis-tri-ethoxy-silyl-ethane) and by using additives/templates. Characterisation results will be presented including SEM analysis, flux and retention measurements. Relations between different preparation parameters and the membrane performance will be presented. Most importantly, it will be shown that it is possible to prepare hybrid silica nanofiltration membranes with a high retention for molecules with a molecular weight of < 400 Dalton.
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