| 摘要 |
<p>The present invention provides a composite semipermeable membrane which is capable of selectively and sufficiently removing a scale component and is also capable of stably obtaining fresh water with high recovery rate. A composite semipermeable membrane of the present invention comprises: a supporting film which comprises a base and a porous supporting layer that is provided on the base; and a polyamide separation function layer that is formed on the porous supporting layer. The polyamide separation function layer is formed of a polyamide that is obtained from an aliphatic polyfunctional amine and a polyfunctional acid halide, and the abundance ratio (molar ratio) thereof satisfies the following relation. 1.2≤number of moles of aliphatic polyfunctional amine/number of moles of polyfunctional acid halide≤1.8</p> |
