Composite semipermeable membrane, production method thereof,...

Details Composite semipermeable membrane, production method thereof,... Composite semipermeable membrane, production method thereof,...

2006-07-25

2006-07-25

Kim, John (Department: 1723)

Liquid purification or separation

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Material

C210S650000, C210S652000, C210S490000

Reexamination Certificate

active

07081202

ABSTRACT:
A composite semipermeable membrance of the present invention comprises a thin film and a porous support membrane supporting the thin film, wherein the thin film includes polyamide based resin having a constituent unit with amide bond between diamine residue and di or tri carboxylic acid residue, in which nitrogen atom of the amide bond has a substituent of aromatic ring. A production method of this invention includes a contacting step of contacting the above composite semipermeable membrane with solution including an oxidizer. In addition, a water treatment method of this invention comprises a step of separating a raw water by a composite semipermeable membrane to obtain permeation water in which salt and/or organic substance is removed sufficiently in practical use, characterized in that the composite semipermeable membrane of this invention is used and a fungicide is added into the raw water.This invention provides a composite semipermeable membrane having practically permeability, and excellent desalting faculty and oxidizer resistance, a production method thereof, and water treatment method using the same.

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