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Title: Absorption process for producing oxygen and nitrogen and solution therefor

Process for the separation and purification of oxygen and nitrogen is disclosed which utilizes solutions of oxygen carriers to selectively absorb oxygen from a gaseous stream, leaving nitrogen as a byproduct. In the process, an oxygen carrier capable of reversibly binding molecular oxygen is dissolved in a solvent solution, which absorbs oxygen from an oxygen-containing gaseous feed stream such as atmospheric air and desorbs oxygen to a gaseous product stream. The feed stream is maintained at a sufficiently high oxygen pressure to keep the oxygen carrier in its oxygenated form during absorption, while the product stream is maintained at a sufficiently low oxygen pressure to keep the carrier in its deoxygenated form during desorption. In an alternate mode of operation, the carrier solution is maintained at a sufficiently low temperature and high oxygen pressure to keep the oxygen carrier in its oxygenated form during absorption, and at a sufficiently high temperature to keep the carrier in its deoxygenated form during desorption. Under such conditions, exceptionally high oxygen concentrations on the order of 95% to 99% are obtained, as well as a long carrier lifetime in excess of 3 months, making the process commercially feasible.
Inventors:
 [1]
  1. (Bend, OR)
Issue Date:
OSTI Identifier:
865023
Assignee:
Bend Research, Inc. (Bend, OR) OSTI
Patent Number(s):
US 4451270
Contract Number:
AC06-79ER10337
Research Org:
BEND RESEARCH INC
Country of Publication:
United States
Language:
English
Subject:
absorption; process; producing; oxygen; nitrogen; solution; separation; purification; disclosed; utilizes; solutions; carriers; selectively; absorb; gaseous; stream; leaving; byproduct; carrier; capable; reversibly; binding; molecular; dissolved; solvent; absorbs; oxygen-containing; feed; atmospheric; air; desorbs; product; maintained; sufficiently; pressure; oxygenated; form; deoxygenated; desorption; alternate; mode; operation; temperature; conditions; exceptionally; concentrations; 95; 99; obtained; lifetime; excess; months; commercially; feasible; carrier solution; oxygenated form; oxygen concentrations; atmospheric air; deoxygenated form; oxygen concentration; gaseous stream; product stream; oxygen-containing gas; feed stream; gaseous product; containing gas; gaseous feed; oxygen pressure; oxygen carrier; carrier lifetime; molecular oxygen; carrier capable; binding molecular; leaving nitrogen; process commercially; alternate mode; reversibly binding; solvent solution; oxygen-containing gaseous; commercially feasible; producing oxygen; selectively absorb; oxygen carriers; utilizes solutions; sorption process; absorption process; absorb oxygen; containing gaseous; /95/252/

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