Composite Semipermeable Membrane, Production Process Thereof, And Element, Fluid Separation Equipment And Method For Water Treatment Using The Same

摘要

A composite semipermeable membrane, which comprises a separating functional layer comprising polyamide formed on a porous substrate film, wherein the separating functional layer comprising polyamide has a mean pore radius of 0.25 nm to 0.35 nm and a vacancy content of 0.2 nm³% to 0.3 nm³%, measured by positron annihilation lifetime spectroscopy.