COMPOSITE SEMIPERMEABLE MEMBRANE AND COMPOSITE SEMIPERMEABLE MEMBRANE MANUFACTURING METHOD

• Main Authors: TANAKA HIROAKI, OGAWA TAKASHI, MINEHARA HIROKI
• Format: Patent
• Language: English; Japanese
• Published: 17.10.2019
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

To provide a membrane which can achieve high water productivity and removability, and acid resistance.SOLUTION: A composite semipermeable membrane comprising: a base material; a porous support layer positioned on the base material; and a separation function layer which is positioned on the porous support layer. The separation function layer has a thin film which contains a cross-linked polyamide as a main component, and the thin film further has a group 13 element. The 13 group element, which elutes in pure water when 100 cmof the composite semipermeable membrane is immersed in 200 mL of pure water at 25°C during 30 minutes, has a concentration of 0.20 mg/L or less.SELECTED DRAWING: None 【課題】高い造水性と除去性、耐酸性を達成する膜を提供する。【解決手段】本発明は、基材と、前記基材上に位置する多孔性支持層と、前記多孔性支持層上に位置する分離機能層とを備えた複合半透膜であって、前記分離機能層は、架橋ポリアミドを主成分とする薄膜を有し、前記薄膜は第１３族元素をさらに含有し、前記複合半透膜１００ｃｍ２を２５℃の純水２００ｍＬに３０分間浸漬したときの前記純水中に溶出した前記第１３族元素濃度が０．２０ｍｇ／Ｌ以下である複合半透膜に関する。【選択図】なし