| 摘要 |
The present invention addresses the problem of providing a composite hollow fiber membrane that is superior in permeation performance and separation performance, has high membrane strength, and is easy to produce, as well as a method for producing same. The present invention pertains to a composite hollow fiber membrane having at least a layer (A) and a layer (B), wherein: the outer diameter of the composite hollow fiber membrane is 20 to 350 μm and the inner diameter thereof is 14 to 250 μm; the tensile elastic modulus of the composite hollow fiber membrane is 1,000 to 6,500 MPa; the layer (A) contains cellulose ester and has the thickness of 0.01 to 5 μm; and the open porosity HA of the layer (A) and the open porosity HB of the layer (B) satisfy HA < HB. |
