Compound-split membrane component and seperation film and use should

摘要

PROBLEM TO BE SOLVED: To provide a composite separation membrane which has a porous support body and a separation function layer formed on the porous support body and where a permeation flux is further improved while maintaining the blocking rate of a dissolution object contained in a separation object liquid.SOLUTION: In a composite separation membrane, a separation function layer is constituted with a polyamide formed by the reaction of a compound group containing an aromatic polyfunctional amine, an aliphatic polyfunctional amine and a polyfunctional acid halide, and a ratio of the aromatic polyfunctional amine in the polyfunctional amines is 1 mol% or more and less than 5 mol%.SELECTED DRAWING: Figure 1