| 摘要 |
Air is compressed in a compressor, pre-purified in an unit, and cooled in a heat exchanger. The resulting flow of air is subjected to a first rectification in a double rectification column so as to separate the air into an oxygen-rich fraction and a nitrogen-rich fraction. A further oxygen fraction, enriched in argon, is withdrawn from the double rectification column and is introduced into the bottom of a second rectification column in which relatively pure argon is separated from the oxygen. A stream of relatively impure argon is supplied from an independent source to an intermediate region of the second rectification column through an inlet thereof.
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