Pressure ratio and its impact on membrane gas separation processes

The optimal point within the Robeson upper boundary

“…They also stated that increasing membrane selectivity to purify flue gas above 30 had little benefit. Huang et al (2014) concluded that the useful selectivity is limited by the operating pressures, which agrees with the results presented in this study. …”

Synergy of CO 2 removal and light hydrocarbon recovery from oil-field associated gas by dual-membrane process

“…The permeate pressures of both membranes are 100 kPa, which yields a sufficient feed/permeate pressure ratio of 15 (Huang et al, 2014). The permeate M A N U S C R I P T…”

Thin-film composite tri-bore hollow fiber (TFC TbHF) membranes for isopropanol dehydration by pervaporation

“…The fabricated fine TFC TbHF shows a high permeance with a reasonable selectivity among the reported data. Moreover, it is worth mentioning that the performance of a membrane with a low permeance but a very high selectivity is reported to easily fall into the pressure-ratio-limited region and thus increases the capital investment due to the requirement of a larger membrane area [68,69]. As a result, the newly fabricated fine TFC TbHF membrane with a high permeance and a moderate selectivity is desirable for industrial applications in comparison to those membranes with low permeance and very high separation factors.…”