Method of producing nitrogen-hydrogen atmospheres for metals...

Details Method of producing nitrogen-hydrogen atmospheres for metals... Method of producing nitrogen-hydrogen atmospheres for metals...

B - Operations, Transporting

01

J

B01J 7/00 (2006.01) B22F 3/10 (2006.01) B23K 35/38 (2006.01) C21D 1/76 (2006.01) C23C 8/20 (2006.01)

Patent

CA 2114206

ABSTRACT An improved method for producing substantially moisture- and oxygen- free, nitrogen-hydrogen atmospheres suitable for annealing, hardening, brazing, and sintering ferrous and non-ferrous metals and alloys is dis- closed. According to the disclosed method, suitable nitrogen-hydrogen atmosphere is produced by 1) generating a nitrogen stream containing about 0.1 to 5% residual oxygen by a known non-cryogenic air separation tech- nique, 2) mixing it with a pre-determined but more than stoichiometric amount of hydrogen required to convert residual oxygen to moisture, 3) con- verting residual oxygen to moisture by reaction with hydrogen in a cat- alytic reactor, 4) cooling the reactor effluent stream, and 5) removing moisture from it in a regenerative sorbent dryer.

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