Chemistry of inorganic compounds – Oxygen or compound thereof
Patent
1982-06-30
1985-09-17
Doll, John
Chemistry of inorganic compounds
Oxygen or compound thereof
55 16, 55 68, 55158, 422122, 422177, 422211, 423219, 436178, C01B 1302
Patent
active
045420106
ABSTRACT:
Process and apparatus for the separation and purification of oxygen and nitrogen as well as a novel membrane useful therein are disclosed. The process utilizes novel facilitated transport membranes to selectively transport oxygen from one gaseous stream to another, leaving nitrogen as a byproduct. In the method, an oxygen carrier capable of reversibly 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 maintained at a 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 its 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 oxygenated complex, releasing oxygen to the product stream, and then diffusing back to the feed side to repeat the process. Exceptionally and unexpectedly high O.sub.2 /N.sub.2 selectivity, on the order of 10 to 30, is obtained, as well as exceptionally high oxygen permeability, on the order of 6 to 15.times.10.sup.-8 cm.sup.3 -cm/cm.sup.2 -sec-cmHg, as well as a long membrane life of in excess of 3 months, making the process commercially feasible.
REFERENCES:
patent: 2388095 (1945-10-01), Stahly
patent: 2824620 (1958-02-01), De Rosset
patent: 2892508 (1959-06-01), Kohman et al.
patent: 2966235 (1960-12-01), Kammermeyer
patent: 3274750 (1966-09-01), Robb
patent: 3396510 (1968-08-01), Ward et al.
patent: 3510387 (1970-05-01), Robb
patent: 3611676 (1971-10-01), Christen et al.
patent: 4032617 (1977-06-01), Gay
patent: 4104037 (1978-08-01), Garrett et al.
patent: 4180388 (1979-12-01), Graham et al.
Scholander, Science, 131, 585, (1960).
Bassett & Schultz, Non-equilibrium facilitated diffusion of oxygen through membranes of aqueous cobaltodihistidine, Biochim. Biophys. Acta., 211, 194, (1970).
Parrett; Membranes succeed by separating, Technology, Mar./Apr. 1981, p. 16.
J. Am. Chem. Soc., 102, 3285, (1980).
J. Am. Chem. Soc., 103, 1236, (1981).
J. Am. Chem. Soc., 101, 1622, (1979).
J. Am. Chem. Soc., 102, 3283, (1980).
European Patent Office, How to Get a European Patent-Guide for Applicants, paragraph 77.
Baker Richard W.
Roman Ian C.
Bend Research Inc.
Doll John
Lange Wayne A.
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