B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/17, 252/30, 2
B01D 53/22 (2006.01) B01D 53/14 (2006.01) B01D 61/38 (2006.01) C01B 13/02 (2006.01) C01B 21/04 (2006.01)
Patent
CA 1214154
Abstract of the Disclosure Process for the separation and purification of oxygen and nitrogen as well as a novel membrane useful therein are disclosed. The process utilizes novel facili- tated transport membranes to selectively transport oxygen from one gaseous stream to another, leaving nitrogen as a byproduct when the feed stream is atmospheric air. In the method, a metallo-organic oxygen carrier capable of rever- sibly binding molecular oxygen is dissolved in a polar organic membrane which separates a gaseous feed stream such as atmospheric air and a gaseous product stream. The feed stream is maintained at a sufficiently high oxygen pressure to keep the oxygen carrier in its oxygenated form at the interface of the feed stream with the membrane, while the product stream is mantained at sufficiently low oxygen pressure to keep the carrier in its deoxygenated form at the interface of the product stream with the membrane. In an alternate mode of operation, the feed stream is maintained at a sufficiently low temperature and high oxygen pressure to keep the oxygen carrier in its oxygenated form at the interface of the feed stream with the membrane and the product stream is maintained at a sufficiently high temperature to keep the carrier in it deoxygenated form at the interface of the product stream With the membrane. Under such conditions, the carrier acts as a shuttle, picking up oxygen at the feed side of the membrane, diffusing across the membrane as the oxyge- nated complex, releasing oxygen to the product stream and then diffusing back to the feed side to repeat the process. Exceptionally and unexpectedly high O2/N2 selectivity, on the order 10 to 30, is obtained, as well as exceptionally high oxygen permeability, on the order of 6 to 15 x 10-8 cm3 -cm/cm2-sec-cmHg, as well as a long membrane life of in excess of 3 months, making the process commercially feasible.
430162
Baker Richard W.
Roman Ian C.
Bend Research Inc.
Oyen Wiggs Green & Mutala Llp
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