| abstract |
For the low-temperature fractionation of air, especially for the production of medium purity oxygen, the entire feed air (1) is compressed in a first compressor stage (2) and purified by adsorption (4). A first component stream (101) of the air is introduced into the high-pressure stage (7) of a two-stage rectifying column (6). A second component stream is passed to the low-pressure stage (8), and this stream is separated, after adsorption (4), from the remaining feed air, heated against compressed feed air (3), and engine-expanded (13). The thus-produced work is utilized at least in part for the compression (2) of feed air. |