Method for obtaining one or more air products, and air separation unit

An air separation unit for obtaining one or more air products, comprising:

• a first booster, a second booster, a first decompression turbine, and a rectification column system which has a high-pressure column that is configured for operation at a first pressure level and a low-pressure column that is configured for operation at a second pressure level below the first pressure level, wherein the air separation unit is configured
• a line for supplying a feed air quantity at a third pressure level which is at least 3 bar above the first pressure level to the air separation unit,
• a line for supplying a first fraction of the feed air quantity at the third pressure level and at a temperature level of −140 to −70° C. to the first booster, wherein said first fraction is compressed to a fourth pressure level in the first booster,
• a line for supplying a second fraction of the feed air quantity or a line for supplying a first portion of the first fraction of the feed air quantity compressed to the fourth pressure level in the first booster to the first decompression turbine, which is used to drive the first booster, and to decompress said second fraction or first portion of the first fraction to the first pressure level using the first decompression turbine,
• a line for supplying a further portion of the first fraction of the feed air quantity compressed to the fourth pressure level to a second booster which is used to compress said further portion to a fifth pressure level, and
• wherein that the air separation plant further comprises a main heat exchanger which is configured to provide the first fraction of the feed air quantity to the first booster at a temperature level of −100 to −60° C., and
• wherein the main heat exchanger of the air separation unit is further configured to heat the further portion of the first feed air quantity to a temperature level of −20 to 40° C. prior to compression of the further portion in the second booster.