| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a composite semi-permeable membrane having high blocking performance against boron not dissociated in a neutral region. SOLUTION: The composite semi-permeable membrane having performance of a water permeation coefficient of 30×10<SP>-12</SP>m<SP>3</SP>/m<SP>2</SP>×Pa s or less, is manufactured by a method of forming a separation functional layer consisting of cross-linked polyamide by the interface polycondensation reaction of a multifunctional amine compound to a multifunctional acid-halide. Then, the composite semi-permeable membrane is subjected to steam treatment in a steam atmosphere heated to 101-140°C in a pressurized condition of 104-364 kPa. A boron permeation coefficient is reduced to 1/3 or less by this treatment. COPYRIGHT: (C)2009,JPO&INPIT
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