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Effect of methanol concentration on the performance of asymmetric cellulose acetate reverse osmosis membranes using dry/wet phase inversion technique

Idris, Ani and Ismail, Ahmad Fauzi and Iswandi, S. and Shilton, Simon J. (2001) Effect of methanol concentration on the performance of asymmetric cellulose acetate reverse osmosis membranes using dry/wet phase inversion technique. Jurnal Teknologi, 34F . pp. 39-50. ISSN 2180-3722

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Abstract

Asymmetric membranes were prepared from a multicomponent dope polymer solution consisting of cellulose acetate, acetone, formamide and methanol. In this work, the dry/wet phase inversion technique is used and the presence of methanol is studied. In addition, this work also presents the fundamental issues involved in altering flat sheet casting solutions to produce solutions, potentially useful for preparing hollow fibers within, defect free selective layers. Variations in the composition of multicomponent casting solution resulted in membranes with drastically different reverse osmosis performance. The membrane performance are determined experimentally by primary parameters such as the pure water permeation rate (PWP), salt permeation rate (PR) and rejection rates. From these data, the secondary parameters such as pure water permeability constant (A), solute transport parameter (DAM/Kd) and mass transfer coefficient (k) are determined. These parameters are important in the prediction of reverse osmosis performance and also in characterising membrane morphology. The results revealed that the presence of methanol in the dope formulation increases the percentage of salt rejection and flux flow. The relatively lower value of (DAM/Kd) for a reference solute indicates a relatively smaller average pore size on the membrane surface.

Item Type:Article
Uncontrolled Keywords:asymmetric membrane, reverse osmosis, cellulose acetate, dry/wet phase inversion
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Natural Resources Engineering
ID Code:40647
Deposited By: Fazli Masari
Deposited On:21 Aug 2014 07:47
Last Modified:01 Nov 2017 04:17

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