CELLULOSE DERIVATIVE HOLLOW FIBER MEMBRANE

摘要

The present invention relates to a cellulose compound hollow fiber membrane having high mechanical strength and is hardly degraded by microorganisms, wherein a cellulose compound is comprised as a membrane material, the thickness of the membrane is 50 to 500 mu m, a dense membrane surface having an average pore diameter of 0.001 to 0.05 mu m exists on the internal and/or external surface thereof, the inside of the membrane is composed of a three-dimensional network-like porous structure having voids with an average pore diameter of 0.05 to 2 mu m, and 70 % by weight or more of the membrane material is cellulose acetate propionate or cellulose acetate butyrate. <IMAGE>