Composite membranes of aromatic-polyamide for desalination: Membrane preparation and characterization.

A new reverse osmosis composite membrane composed of the following aromatic polymer was estudied. Composite membranes were successfully prepared from PTDS by the conventional phase-inversion method. A typical example of the basic membrane performances is as follows; water flux, 440 1/m2 day and salt rejection, 97.7% determined under the pressure of 40 atm., using 0.1% NaCl solution at 25 °C. The PTDS membrane was characterized by its excellent chemical and thermal resistances, especially against acid, alkali and oxidative atmospheres. These features suggest that the PTDS membrane is a promising candidate for water desalination.