| 摘要 |
PURPOSE:To obtain the title composite membrane with a 10-40% increase in the water permeation velocity as compared with the conventional membrane by using an ultrathin membrane consisting of a cross-linked aromatic polyamide obtained by interface reaction using an acylation catalyst. CONSTITUTION:A porous carrier membrane having micropores of several tens to several thousands Angstrom on the surface is used. An ultrathin membrane consisting essentially of a cross-linked aromatic polyamide is formed on the carrier membrane by interface reaction. An aq. soln. of a compd. having >=2 amino groups directly joined to the aromatic ring is coated on the surface of the porous carrier membrane, then a compd. having >=2 acyl halide groups directly joined to the aromatic ring is dissolved in a solvent immiscible with water, and the soln. is brought into contact with the above-mentioned coated material to form the ultrathin membrane. In this case, when the acylation catalyst is added to one or both solns., the water permeability of the semipermeable composite membrane is improved. The amt. of the catalyst to be added is controlled to 0.1-10% when the catalyst is added to the aq. soln., and the amt. is preferably adjusted to about 10-1,000ppm when the catalyst is added to the other soln. |
