• Membrane Journal
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• v.25 no.5
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• pp.391-397
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• 2015

The porous support polyvinylidene fluoride (PVDF) with a salting out based on the hollow fiber membrane polyethyleneimine (PEI) and polyvinylsulfonic acid (PVSA) by coating with by phase separated and pressurization (PSP) method to produce a multilayer membrane. The resulting membranes were characterized under the various conditions, such as the heat treatment temperature, coating concentration, feed concentration, cross-linking time and cross-link agent concentration in terms of flux and rejection rate for NaCl 100 ppm solution at 4 atm. The best results were PEI 20,000 ppm and PVSA 1,000 ppm, PEI 15% with a 2% malic acid aqueous solution coated by PSP method the hollow fiber membrane heat-treated for 1 minute showed flux 24.3 LMH, the rejection of 82.1%.

• Membrane Journal
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• v.25 no.5
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• pp.440-446
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• 2015

Nanofiltration composite membranes were prepared through the ion exchange polymers coating onto the porous microfiltration polyethylene (PE) membrane surfaces the salting-out and phase separated and pressurization (PSP) methods. The existence of coating on the surfaces was confirmed by the scanning electronic microscopy. The resulting membranes were characterized under the various conditions, such as the coating material, coating time, ionic strength etc., in terms of flux and rejection for NaCl 100 ppm solution. Under the same coating conditions of 10,000 ppm coating solution concentration and 3 atm coating pressure for both the coating materials of PEI and PSSA_MA, the flux 91.2 LMH and rejection 64.6% were obtained for PEI whereas 122.7 LMH and 38.1% were observed for PSSA_MA. From this study, it may be concluded that the composite membrane preparation is possible.