Composite separation membrane

Abstract

The purpose of this invention is to provide a composite separation membrane that exhibits excellent permeability even when the molecular weight is set to approximately 500-3000. The composite separation membrane of this invention comprises: a separation functional layer containing a cross-linked resin obtained by interfacial polycondensation, and a support membrane containing at least a porous layer. The separation functional layer is disposed on the surface of the support membrane. The cross-linked resin is a cross-linked polyamide resin. The raw material monomer of the cross-linked polyamide resin includes a polyfunctional amine and a polyfunctional amide halide. The polyfunctional amine has a partial structure in which an amino group or aminomethyl group is bonded at the 1,3- or 1,4-position on a six-membered alicyclic ring, and the PBF score is 0.2 or higher.

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