Abstract
Microporous polypropylene hollow fibers can be coated with a 1.9 μm layer of perfluorosulfonic acid polymer ('Nafion'), to give membranes selective for ammonia. The permeability, of the order of 104 barrers, is comparable with that obtained previously for thick flat perfluorosulfonic acid membranes, though the permeance is much higher. The selectivity for ammonia over hydrogen can be as high as 500:1 at room temperature; it is much higher for ammonia over nitrogen. This selectivity drops as the temperature rises. These composite membranes will be commercially valuable if they can be made to withstand the high pressures characteristic of ammonia synthesis.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 19-26 |
| Number of pages | 8 |
| Journal | Journal of Membrane Science |
| Volume | 104 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Aug 15 1995 |
Bibliographical note
Funding Information:The authors benefited from conversations with Dr. D:V. Laciak of Air Products and Professor G.W. Stevens of the University of Melbourne. The work was principally supported by the National Science Foundation (CTS 91-23837). Other support came form the Advanced Research Project Agency (92-05112) and Environmental Protection Agency - Center for Clean Industrial and Treatment Technologies (MTU 00569).
Keywords
- Coated hollow fibers
- Gas separations
- Ion exchange membranes