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Study on the effect of polymer concentration on hollow fiber ultrafiltration membrane performance and morphology

Mustaffar, M. I. and Ismail, A. F. and Illias, R.M (2004) Study on the effect of polymer concentration on hollow fiber ultrafiltration membrane performance and morphology. In: Regional Conference on Engineering Education RCEE 2005, 12-13 Dec 2005, Johor, Malaysia.

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Abstract

The effects of polymer concentration on separation performance and morphology of polyethersulfone hollow fiber (HF) ultrafiltration membrane has been investigated. The hollow fiber ultrafiltration membranes were produced by using a dry/wet spinning process with forced convection in the dry air gap. Three new polymer solutions were developed by using turbidimetric titration method. The formulation of polymer solution is done by varying the polymer concentration in the range of 18-22 wt.%. These new polymer solutions which is consist of polyethersulfone, 1-methyl-2-pyrrolidone (NMP), polyethylene glycol (PEG) and distilled water were developed to be very close to its cloud point (binodal line) in order to accelerate the coagulation of nascent fiber as much as possible so that the relaxation effect on molecular orientation was reduced. The experimental results showed that the flux of the hollow fiber ultrafiltration membranes decreases while the separation performance for particle solute increases with an increase in polymer concentration. This means that the outer skin layer of the membranes becomes apparently thicker and denser with increasing polymer concentration. On the other hand, spinning asymmetric hollow fiber membranes from a dilute polymer solution produced a thin and porous skin layer, leading to a high value of flux but a relatively low percentage of rejection for cyclodextrin separation.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Hollow fiber ultrafiltration membrane; hollow fiber spinning; polymer concentration effect
Subjects:T Technology > TP Chemical technology
ID Code:1050
Deposited By: Pn Norazana Ibrahim
Deposited On:23 Feb 2007 09:03
Last Modified:01 Jun 2010 02:50

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