Composite porous hollow fiber membrane, production method for composite porous hollow fiber membrane, composite porous hollow fiber membrane module, and operation method for composite porous hollow fiber membrane module

The present invention relates to a composite porous hollow fiber membrane that comprises at least a first and a second layer that contain a fluorine resin polymer. The first layer has a columnar structure that is oriented in the long direction of the composite porous hollow fiber membrane, and the average value ν of the Raman orientation parameters of the columnar structure, as calculated on the basis of a specific formula, is 1.5-4.0. The second layer has a three-dimensional mesh structure, and the surface of the second layer has an average pore diameter of 5.0 nm to 5.0 μm.