Method for obtaining one or more air products and air separation system

An air separation system configured for obtaining one or more air products comprising:

• a rectification column system,
• wherein the air separation system having said rectification column system is configured to process pressurized air in an adjustable total air volume in the rectification column system and a total volume of air to be processed is set to a first value during a first operating time period and to a second value different from the first value during a second operating time period, and to change the setting of the total volume of air to be processed from the first value to the second value in a third operating period from a first time and up to a second time,
• wherein the second operating period is after the first operating period, and the third operating period is between the first operating period and the second operating period,
• air separation system further comprising a control unit that, in the third operating period, is programmed to change a setting of a volume of a fluid, formed from pressurized air via the rectification system and transported into or out of the rectification column system from a third time and up to a fourth time, wherein the third time is before or after the first time and before the second time, and the fourth time is after the first time and the third time and before or after the second time, and to set a time period between the first time and the second time such that it does not differ by more than 20% from a time period between the third time and the fourth time,
• wherein the rectification column system has a high-pressure column operated at a first pressure level and a low-pressure column operated at a second pressure level below the first operating pressure, wherein a gaseous, nitrogen-rich overhead product is formed in the low-pressure column,
• wherein the time period between the first time and the second time is set by changing the first time and/or the second time,
• wherein a time period between the first time and the third time is set by changing the third time as a function of the setting of the time period between the first time and the second time, and
• wherein the third time is after the first time, and the fourth time is after the second time, wherein a time period between the first time and the third time is lengthened when the period between the first time and the second time is shortened.