Abstract
AbstractIn this work, a nanofiltration membrane prepared from soluble polyimide (HQDPA‐DMMDA) was used to concentrate benzylpenicillin sodium solutions at 10 and 14°C. Three benzylpenicillin sodium solutions with the concentration of 7.2, 13.0, and 19.7 g/L were used. The pressure varied from 0.5 to 2.0 MPa. The rejection reached 85% for the solution of 19.7 g/L under 2.0 MPa. To the solution of 7.2 g/L, the largest permeation flux was 9.5 kg/m2 h. Temperature had a slight influence on flux, but the influence on rejection was complicated. A sharp increasing phenomenon of rejection appeared under 0.5 MPa when the concentration was 19.7 g/L. This was elucidated by Martínez‐Landeira's works on benzylpenicillin's colloids. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007
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