Refrigeration – Processes – Circulating external gas
Patent
1994-04-20
1995-08-01
Kilner, Christopher
Refrigeration
Processes
Circulating external gas
62 38, 62 39, F25J 304, F25J 302
Patent
active
054371600
ABSTRACT:
A process and installation for the separation of air in a cryogenic distillation apparatus (24) comprising a distillation column (30, 42) and in which the supplied air is separated to produce a fraction rich in oxygen and a fraction rich in nitrogen as products. The purities of these products are maintained substantially constant during variations of demand of either product or of the flow rate or of the pressure of the supplied air by introducing an excess of liquid rich in nitrogen into the distillation apparatus when the demand for the product or the flow rate of the supplied air increases, and by withdrawing an excess of liquid rich in nitrogen from the distillation apparatus, and storing this liquid, when the demand for the product or the flow rate of the supplied air decreases. The apparatus comprises a medium pressure column (30) and a low pressure column (42) and a reflux conduit (44; 11, 12) which permits a reflux liquid to be withdrawn from the medium pressure column (30) and to be injected into the low pressure column (42).
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Darredeau Bernard
Lehman Jean-Yves
Peyron Jean-Marc
Kilner Christopher
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
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