Refrigeration – Processes – Circulating external gas
Patent
1989-08-11
1990-10-30
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 39, F25J 302
Patent
active
049660020
ABSTRACT:
Process for the recovery of nitrogen from air in which gaseous air is compressed, cooled and optionally purified in a heat exchanger, and then distilled to obtain pure gaseous nitrogen overhead and an oxygen enriched liquid bottoms, wherein all of the bottoms and a portion of the overhead is passed to a condenser to form an oxygen enriched gas and liquid nitrogen and wherein at least a portion of the oxygen enriched gas is compressed and recycled to the distillation column to enhance recovery of the nitrogen product.
REFERENCES:
patent: 3203193 (1965-08-01), Ruhemann et al.
patent: 3217502 (1965-11-01), Keith, Jr.
patent: 4400188 (1983-08-01), Patel et al.
patent: 4566887 (1986-01-01), Openshaw
patent: 4715873 (1987-12-01), Auvil et al.
patent: 4867773 (1989-09-01), Thorogood et al.
Heat Pumps in Distillation by H. R. Null, Monsanto Co., St. Louis, Mo.; CEP Jul. 1976, pp. 58-64.
Mostello Robert A.
Parker Clayton E.
Capossela Ronald C.
Nemetz Carol A.
Pearlman Robert I.
The BOC Group Inc.
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