Single end, shell-side feed, hollow fiber membrane separation module

A shell-side feed, hollow fiber, fluid separation module arranged for counter-flow includes a hollow fiber membrane bundle with each individual hollow fiber membrane (31) in the bundle (30) having an open fiber end (39) and a sealed fiber end (43), The open fiber ends (39) are encapsulated in a tubesheet (19) located toward the permeate fluid outlet end (17) of the module (10). The sealed fiber ends (43) are tubesheet-free, uniformly spaced, and located toward the non-permeate fluid outlet end (41) of the module (10).