Title:
COMPOSITE SEMIPERMEABLE MEMBRANE, AND FILTRATION METHOD USING COMPOSITE SEMIPERMEABLE MEMBRANE
Document Type and Number:
Japanese Patent JP2021069988
Kind Code:
A
Abstract:
To provide a composite semipermeable membrane having a high silica removal rate, and having silica removal rate stability under a high temperature/existence of a heavy metal.SOLUTION: A composite semipermeable membrane has a microporous support layer, and a separation function layer provided on the microporous support layer. In the composite semipermeable membrane, the separation function layer contains crosslinked total aromatic polyamide as a main component, and an average thickness of the separation function layer determined from a cross-sectional image of a transmission electron microscope is 10 nm or more and 20 nm or less, and a nitrogen atom area density of the separation function layer determined from Rutherford backscatter is 8.0×1016/cm2 or more and 1.2×1017/cm2 or less.SELECTED DRAWING: Figure 1
Inventors:
SHIMURA HARUKI
MINEHARA HIROKI
OGAWA KUMIKO
OGAWA TAKASHI
MINEHARA HIROKI
OGAWA KUMIKO
OGAWA TAKASHI
Application Number:
JP2019198704A
Publication Date:
May 06, 2021
Filing Date:
October 31, 2019
Export Citation:
Assignee:
TORAY INDUSTRIES
International Classes:
B01D71/56; B01D61/02; B01D63/10; B01D69/12; C02F1/44; C08G69/32