Olefins-selective asymmetric carbon molecular sieve hollow fiber membranes for hybrid membrane-distillation processes for olefin/paraffin separations

► Formation of defect-free asymmetric 6FDA-DAM and 6FDA/BPDA-DAM hollow fiber membranes. ► Maintaining asymmetric morphology of carbon molecular sieve hollow fiber membranes by using high-Tg precursor polymers. ► Olefins-selective membranes for mixed carbon number olefin/paraffin separations. ► Novel hybrid membrane-distillation processes.