Gas separation membrane bundle with convertible flow configurations

A hollow fiber membrane bundle that is convertible into a hollow fiber membrane module with a cross-flow configuration or a hollow fiber membrane module with a counter-current configuration, comprising hollow fiber membranes arranged around a porous support tube, a cured resin tubesheet formed at first end of the bundle, and a cured resin nub formed at a second end of the bundle, wherein:

• the bore(s) of the hollow fiber membranes are open at a face of the tubesheet adjacent the first end of the bundle;
• the tubesheet adjacent the first end of the bundle has an annular structure that encapsulates the hollow fiber membranes and the support tube at the first end of the bundle but which does not completely block a first end bore of the porous support tube;
• the bore(s) of the hollow fiber membranes are open at a face of the nub adjacent the second end of the bundle and the nub adjacent the second end of the bundle has a structure that encapsulates the hollow fiber membranes and the support tube at the second end of the bundle and completely blocks a second end bore of the porous support tube;
• and
• the collection tube has a plurality of orifices formed in an outer circumferential surface of the collection tube at positions adjacent to the tubesheet, positions adjacent to the nub, and positions in between the tubesheet and the nub.