Hollow fiber membranes are membranes that are fibre-like in shape and self-supporting. Hollow fiber membranes are made from polysulfone and dimethylacetamide, which are processed into fibrous filaments with a hollow inner cavity, and then divided by a highly permeable polymer, which has selective permeation characteristics. As water vapour, hydrogen, ammonia and carbon dioxide permeate faster, while methane, nitrogen, argon, oxygen and carbon monoxide permeate slower, this separates the fast permeating from the slow permeating.

Hollow fiber membranes are membranes that are fibre-like in shape and self-supporting. Hollow fiber membranes are made from polysulfone and dimethylacetamide, which are processed into fibrous filaments with a hollow inner cavity, and then divided by a highly permeable polymer, which has selective permeation characteristics. As water vapour, hydrogen, ammonia and carbon dioxide permeate faster, while methane, nitrogen, argon, oxygen and carbon monoxide permeate slower, this separates the fast permeating from the slow permeating.