COMPOSITE SEMIPERMEABLE MEMBRANE, AND SPIRAL MEMBRANE ELEMENT

    公开(公告)号:US20240293783A1

    公开(公告)日:2024-09-05

    申请号:US18440083

    申请日:2024-02-13

    CPC classification number: B01D69/12 B01D63/10 B01D71/56 B01D71/68 B01D2325/20

    Abstract: A composite semipermeable membrane includes: a porous support including a porous resin layer; and a separation functional layer formed of a polyamide-based resin on the porous resin layer. The polyamide-based resin contains a resin component derived from a divalent polyfunctional amine and a trivalent or higher polyfunctional acid halide, a molar ratio of the trivalent or higher polyfunctional acid halide to the divalent polyfunctional amine is in a range of 0.65 to 1.00, and a terminal carboxyl group concentration is 0.01 or less. The composite semipermeable membrane has an amide intensity ratio of 0.60 or more, the amide intensity ratio being a ratio of an absorption peak intensity derived from C═O stretching vibration of an amide group to an absorption peak intensity derived from a repeating unit of the porous resin layer, when measuring the absorption peaks by an ATR-IR method.

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