Process for recovering nitrogen from oxygen-containing gas mixtu

Details Process for recovering nitrogen from oxygen-containing gas mixtu Process for recovering nitrogen from oxygen-containing gas mixtu

1984-03-07

1985-10-22

Heller, Gregory A.

Chemistry of inorganic compounds

Nitrogen or compound thereof

55 25, 55 26, 423239, C01B 2100, B01J 800, B01J, B01D 5100

Patent

active

045487995

ABSTRACT:
A gas mixture containing significant proportions of nitrogen and oxygen, such as atmospheric air, is alternately passed through two adsorbers containing a carbonaceous molecular sieve such as comminuted coke. With one-minute half-cycles, each half-cycle encompasses a production phase of 55 seconds during which the gas mixture is driven under high pressure through one adsorber with recovery of high-purity nitrogen therefrom while the other adsorber is being exhausted or vented in a regeneration phase. During a small fraction of the remaining 5 seconds of this half-cycle, preferably lasting between 0.3 and 0.7 second, the two adsorbers are interconnected for a partial equalization of their pressures. In the final period of slightly more than 4 seconds, the regeneration phase of the first adsorber begins while the second adsorber is pressurized with fresh gas mixture, its outlet being closed at that time. The next half-cycle starts with that outlet being opened to enable the discharge of further high-purity nitrogen.

REFERENCES:
patent: 4203958 (1980-05-01), Snarski
patent: 4386945 (1983-06-01), Gardner
patent: 4415340 (1983-11-01), Knoblauch et al.
patent: 4440548 (1984-04-01), Hill
patent: 4494966 (1985-01-01), Vmeki
Druckwechsel-Adsorptionsanlagen--Grundlagen und Anwendung, II, H. Juntgen, B. Harder, K. Knoblauch, (Technik Im Betrieb, pp. 87-90).

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