Composite porous hollow fiber membrane, method for producing composite porous hollow fiber membrane, composite porous hollow fiber membrane module, and method for operating composite porous hollow fiber membrane module

摘要

The present invention is a composite porous hollow fiber membrane comprising at least a first layer and a second layer containing a fluororesin-based polymer, wherein the first layer is in the longitudinal direction of the composite porous hollow fiber membrane. The columnar structure has an oriented columnar structure, the average value ν of Raman alignment parameters in the columnar structure calculated based on the specific formula is 1.5 or more and 4.0 or less, and the second layer has a three-dimensional network structure. In addition, the present invention relates to a composite porous hollow fiber membrane having an average pore diameter on the surface of the second layer of 5.0 nm or more and 5.0 μm or less.