| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 10.99 |
| PATENT ASSIGNEE | American Air Liquide |
| PATENT CLAIMS |
- Electrolytically reducing Al2O3 dissolved in mixt of molten cryolite & AlF3 in an electrolysis cell to produce Al - Withdrawing a vent gas comprising F2, HF, & CF4 & C2F6 from said cell - Contacting said vent gas with alumina to react F2 & HF with said alumina to produce AlF3 & gas stream contg CF4 & C2F6 - Recycling portion of AlF3 to said cell - Contacting said gas stream comprising CF4 & C2F6 with membrane to obtain retentate stream rich in CF4 & C2F6 & permeate stream depleted in CF4 & C2F6 |
| PATENT PHOTOCOPY | Available on request |
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