| 摘要 |
Air is raised in pressure by a compressor 2 and pre-purified by removal of impurities, particularly H2O vapour and CO2, in an adsorption unit 4. The resulting air is cooled in a heat exchanger 6, and is subjected to a first rectification in a rectification column 12 in which the air is separated into a nitrogen-rich fraction and an oxygen-rich fraction. A further oxygen fraction enriched in argon is subjected to a second rectification in which argon is separated from oxygen in a rectification column 34. First and second argon products of different purity are withdrawn from the column 34 through outlets 38 and 40 respectively. <IMAGE> |
