FLUID SEPARATION ELEMENT

摘要

FLUID SEPARATION ELEMENT of the disclosure: The invention relates to a fluid separation element comprising a casing and a bundle of selectively permeable hollow fibers accomodated therein, the bundle being potted with a resinous potting agent at the end portions and the gaps between the hollow fibers being blocked with the resinous potting agent. The hollow fibers are such that (1) the ratio of the porosity of the membrane of the hollow fibers at the effective permeation portion (HA) and the porosity of the membrane of the hollow fibers at the potting portion (HB) satisfies the following condition: 0.9 > HB/HA > 0.4; and (2) the outer diameter of the hollow fibers at the effective permeation portion (ODA) and the outer diameter of the hollow fibers at the potting portion (ODB) satisfies the following condition: 0.95 > ODB/ODA > 0.7. By using such fibers, a firm potting between the hollow fibers and the resinous potting agent is achieved, and a good separation efficiency without an increase in pressure loss can be maintained for a long period of time.