Some Design Aspects of Aromatic Polyamide Reverse-Osmosis Membranes

✍ Scribed by Wood, Hal ;Sourirajan, S.

• Publisher: Curtin University of Technology
• Year: 2008
• Tongue: English
• Weight: 560 KB
• Volume: 1
• Category: Article
• ISSN: 0969-1855
• DOI: 10.1002/apj.5500010405

✦ Synopsis

Linear-polymer solutions are comparable to a suspension of macromolecule spheres.

Macromolecules concentrate at the interface during the membrane-forming procedure. They coalesce with each other suficiently for the su$ace to become a sheet of interconnected macromolecules. Interstitial voids are formed whose magnitude is dependent on the size and packing arrangement of the macromolecules, and is also influenced by the extent of coalescence occurring in the interstitial voids. A subsequent gelation procedure renders the macromolecules paracrystalline. During operation, the membrane allows permeation of solution components primarily through the interstitial voids.Membrane design requires the ability to predict membrane pe~ormance from the precursor casting conditions. This paper illustrates the practical utility of the interstitial void model for membrane design purposes. Some design aspects are presented for various reverse-osmosis membranes made from an aromatic polyamide polymer.