Patent ID: 7279097
Filing Date: 2007-10-09
Classification: B01D,C02F,Y02A

Abstract:
1. A composite semipermeable membrane which satisfies the following relationship when seawater at 25° C. having a pH of 6.5, a boron concentration of 5 ppm and a TDS concentration of 3.5 by weight is permeated under an operation pressure of 5.5 Mpa: wherein: the composite semipermeable membrane comprises a separating functional layer comprising polyamide formed on a porous substrate film, the polyamide comprising crosslinked polyamide formed by means of interfacial polycondensation by contacting, on the porous substrate film: wherein the aliphatic acid halide is at least one selected from the group consisting of methanesulfonyl chloride, acetyl chloride, propionyl chloride, butyryl chloride, oxalyl chloride, malonic acid dichloride, succinic acid dichloride, maleic acid dichloride, fumaric acid dichloride, chlorosulfonylacetyl chloride, and N,N-dimethylaminocarbonyl chloride.