The performance of novel reverse osmosis membranes made from poly-2-vinylimidazoline. I.

✍ Scribed by M.J. Hurndall; E.P. Jacobs; R.D. Sanderson

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 844 KB
• Volume: 86
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(92)80030-d

✦ Synopsis

Novel thin-film composite reverse osmosis (RO) membranes were fabricated by the interfacial polycondensation of poly-2-vinylimidazoline precursors and the aromatic acid chloride crosslinking agents: 3-(chlorosulphonyl)benzoyl chloride, 3,5di(chlorosulphonyl)benzoyl chloride and benzene-1,3,-dicarboxylic acid dichloride. Three different forms of precursor were used, the difference depending on their methods of preparation. In aqueous solution, the poly-2-vinylimidazoline precursor was partially hydrolyzed and contained some N-aminoethylamide groups.

Membranes were tested for salt retention and permeate flux, first under standard conditions and then tubular membranes were tested under severe conditions. The latter comprised: low and high pH, elevated temperature, elevated pressure and chlorinated feed solutions. Tubular membranes, optimized for high retention and flux, gave RO performances of up to 98.2*0.7% retention and a flux of 23.3 k6.3 l/m2 membrane area per hour (lmh) when tested at 2 MPa with a 2000 mg/l NaCl feed solution at 20°C. These membranes were not stable at low pH and high chlorine levels.