Abstract: The process and the device are used for low-temperature separation of air with a distilling-column system for nitrogen-oxygen separation (20), which has at least one separation column (21, 22). A main air stream (1, 5) is compressed in an air compressor (2) and purified in a purification device (4). A first air stream (7) and a second air stream (8) are diverted from the main air stream (5). The first air stream (7) is further compressed in two secondary compressors (10, 13) that are connected in series. The further compressed first air stream (15) is cooled by indirect heat exchange (16), and at least partially liquefied or pseudo-liquefied, and then introduced into the distilling-column system for nitrogen-oxygen separation (20). The second air stream (8) is cooled by indirect heat exchange (16) and then, divided into two partial streams (24, 27), is actively depressurized in two expanders (25, 28), whereby the two expanders have essentially the same inlet pressure.

Abstract: In a low-temperature separation of air in a distillation system, having at least one high-pressure column (11) and one low-pressure column (12), process air (20, 32) is introduced into the high-pressure column (11). A liquid product stream (42; 46) is removed from the distillation system, brought in the liquid state to an elevated pressure (43; 47), evaporated or pseudo-evaporated under this elevated pressure by indirect heat exchange (6), and finally drawn off as a gaseous product stream (45; 49). All of the process air (1) is compressed in a main air compressor to a first pressure, which is at least equal to the operating pressure of the high-pressure column (11) and then is purified in a purification device. A first partial stream (2, 7) of the process air is fed under approximately the first pressure to a first expander (8), actively depressurized there to approximately the operating pressure of the low-pressure column (12), and then introduced (10) into the low-pressure column (12).

Abstract: The process and the device are used to produce a pressurized gaseous product by low-temperature separation of air in a distillation system, which has at least one high-pressure column (7) and one low-pressure column (8). A process air stream is compressed in a main air compressor. At least a part of the compressed process air stream (1) is introduced (6) into the high-pressure column (7). A first air stream (10, 13, 14, 17, 18), which is formed at least by a part of the process air stream (1), is compressed to a high air pressure (11, 15), which is at least 1 bar above the operating pressure of the high-pressure column (7). A liquid product stream (21, 47) is removed from the distillation system, brought (48, 51) to an elevated pressure in the liquid state, and evaporated or pseudo-evaporated with the first air stream (17) under this elevated pressure by indirect heat exchange (4), and finally drawn off as a gaseous product stream (50, 53).

Abstract: A plate heat exchanger for indirect heat exchange of several fluid flows (30, 40, 50) with a heat transfer medium/cooling medium (10, 20) in a heat exchanger core (9) has a plurality of heat exchange passages within the core for the heat transfer medium/cooling medium (10, 20), a first fluid flow (30, 40, 50) and a second fluid flow (30, 40, 50). All heat exchange passages for the first fluid flow (40) are located In a first component area, and all heat exchange passages for the second fluid flow (30) are located in a second component area. The first and the second component areas do not intersect and each extend over the entire height of the heat exchanger core (9). The heat exchanger is particularly suitable for use in air-separation processes.

Abstract: The invention relates to a bath condenser with a condenser block (1) that has evaporation passages (8) for a liquid and liquefaction passages (2) for a heating medium and at least two circulation sections (7) that are located vertically on top of one another. The evaporation passages (8) each have on the lower end of a circulation section (7) at least one entry opening (9) for the liquid and on the upper end of a circulation section (7) at least one exit opening (10), for each circulation section (7) there being a liquid storage tank (15) that is flow-connected to the entry opening (9) and the exit opening (10) of the circulation section (7) and that has a gas offtake (18). The inlet into the gas offtake (18) is not located in the area in front of the side (12) of the circulation section (7) in which the exit opening (10) of the circulation section (7) is located.

Abstract: The invention relates to a process for the low-temperature fractionation of air in a rectification unit, which comprises a pressure column (1) a low-pressure column (2) and a condenser-evaporator system having at least two falling-film evaporators (203, 204). Oxygen-rich liquid from the low-pressure column (2) is introduced into the evaporation passages of the first and second falling-film evaporators (203, 204) and is partially evaporated. Unevaporated oxygen-rich liquid from the first falling-film evaporator (203) is transferred into the evaporation passages of the second falling-film evaporator (204).

Abstract: The invention relates to a bath condenser with a condenser block (1) that has evaporation passages (8) for a liquid and liquefaction passages (2) for a heating medium and at least two circulation sections (7) that are located vertically on top of one another. The evaporation passages (8) each have on the lower end of a circulation section (7) at least one entry opening (9) for the liquid and on the upper end of a circulation section (7) at least one exit opening (10), for each circulation section (7) there being a liquid storage tank (15) that is flow-connected to the entry opening (9) and the exit opening (10) of the circulation section (7) and that has a gas offtake (18). The inlet into the gas offtake (18) is not located in the area in front of the side (12) of the circulation section (7) in which the exit opening (10) of the circulation section (7) is located.

Abstract: A process and apparatus for low-temperature fractionation of air in a distillation column system for nitrogen-oxygen separation (5, 6) introduces into first feed air stream (4) into a distillation column system for nitrogen-oxygen separation. An oxygen-rich fraction (22) from the distillation column system for nitrogen-oxygen separation is pressurized (23) in liquid form and is added (25) to a mixing column (26). A heat transfer medium stream is introduced into the lower region of the mixing column (26) and is brought into countercurrent contact with the oxygen-rich fraction (22, 25). Gaseous top product (260) from the upper region of the mixing column (26) is introduced into an additional column (27). A liquid (38, 39, 40, 41) from the lower or middle region of the mixing column is introduced into the distillation column system.

Abstract: A plate heat exchanger for indirect heat exchange of several fluid flows (30, 40, 50) with a heat transfer medium/cooling medium (10, 20) in a heat exchanger core (9) has a plurality of heat exchange passages within the core for the heat transfer medium/cooling medium (10, 20), a first fluid flow (30, 40, 50) and a second fluid flow (30, 40, 50). All heat exchange passages for the first fluid flow (40) are located In a first component area, and all heat exchange passages for the second fluid flow (30) are located in a second component area. The first and the second component areas do not intersect and each extend over the entire height of the heat exchanger core (9). The heat exchanger is particularly suitable for use in air-separation processes.

Abstract: The invention relates to a process for the low-temperature fractionation of air in a rectification unit, which comprises a pressure column (1) a low-pressure column (2) and a condenser-evaporator system having at least two falling-film evaporators (203, 204). Oxygen-rich liquid from the low-pressure column (2) is introduced into the evaporation passages of the first and second falling-film evaporators (203, 204) and is partially evaporated. Unevaporated oxygen-rich liquid from the first falling-film evaporator (203) is transferred into the evaporation passages of the second falling-film evaporator (204).

Abstract: A process and apparatus for low-temperature fractionation of air in a distillation column system for nitrogen-oxygen separation (5, 6) introduces into first feed air stream (4) into a distillation column system for nitrogen-oxygen separation. An oxygen-rich fraction (22) from the distillation column system for nitrogen-oxygen separation is pressurized (23) in liquid form and is added (25) to a mixing column (26). A heat transfer medium stream is introduced into the lower region of the mixing column (26) and is brought into countercurrent contact with the oxygen-rich fraction (22, 25). Gaseous top product (260) from the upper region of the mixing column (26) is introduced into an additional column (27). A liquid (38, 39, 40, 41) from the lower or middle region of the mixing column is introduced into the distillation column system.

Abstract: The process and device are used to obtain a compressed product by low temperature separation of air in a rectification system which has a pressure column and a low pressure column. A first flow of compressed and purified feedstock air is cooled in a main heat exchanger system and is fed into the pressure column. At least one fraction from the pressure column is expanded and fed into the low pressure column. An oxygen-rich fraction from the low pressure column is liquid-pressurized and delivered to a mixing column. A heat exchange medium is fed into the lower area of the mixing column and is brought into countercurrent contact with the oxygen-rich fraction. A gaseous top product is removed from the upper area of the mixing column. A product fraction is removed from the rectification system, liquid-pressurized, vaporized in indirect heat exchange with the gaseous top product of the mixing column and is withdrawn as the compressed product.

Abstract: For the indirect heat-exchange of a plurality of gas streams (14, 15, 16) with a heat-cold carrier (2, 7) in heat-exchange blocks (23a, b, c, d, e) in which the gas streams (14, 15, 16) are passed through a multiplicity of heat-exchange passages, only one of the gas streams (14, 15, 16) is passed in this case through at least one heat-exchange block (23a, b, c, d, e). The heat-exchange passages of the heat-exchange block (23a, b, c, d, e), through which this gas stream (14, 15, 16) flows end at two end surfaces of the heat-exchange block (23a, b, c, d, e). The gas stream (23a, b, c, d, e) is fed to an taken off from these heat-exchange passages via in each case a collector/distributor (41) connected to the heat-exchange block (23a, b, c, d, e), which collector/distributor extends in each case over the entire end surface of the heat-exchange block (23a, b, c, d, e).

Abstract: For adjusting the capacity of a low-temperature rectification unit having a high pressure column and a low pressure column in which a fluid is introduced into the high pressure column (1) and in which liquid from the bottom of the high pressure column is directed into the low pressure column (2), the amount of liquid that is removed from the bottom of high pressure and fed to the low pressure column (2) is controlled via flow adjustment (4), wherein a nominal value for flow adjustment (4) is set to a desired amount of flow, and the liquid level of the liquid at the bottom of column (1) that operates at higher pressure is fixed without a set nominal value corresponding to the amount of liquid that is removed.

Abstract: The process and device are used to obtain a compressed product by low temperature separation of air in a rectification system which has a pressure column and a low pressure column. A first flow of compressed and purified feedstock air is cooled in a main heat exchanger system and is fed into the pressure column. At least one fraction from the pressure column is expanded and fed into the low pressure column. An oxygen-rich fraction from the low pressure column is liquid-pressurized and delivered to a mixing column. A heat exchange medium is fed into the lower area of the mixing column and is brought into countercurrent contact with the oxygen-rich fraction. A gaseous top product is removed from the upper area of the mixing column. A product fraction is removed from the rectification system, liquid-pressurized, vaporized in indirect heat exchange with the gaseous top product of the mixing column and is withdrawn as the compressed product.

Abstract: In a single column distillation system for obtaining gaseous and liquid nitrogen with a variable proportions of liquid product by low-temperature separation from air, a first portion (12, 13) of nitrogen-rich fraction (5, 7, 8) is fed downstream of circulation compressor (9) to the liquefaction chamber of a condenser-evaporator (14) associated with the single column and condensed under a pressure higher than the operating pressure of the single column (4). A liquid oxygen-enriched fraction (228, 231) from the distillation column system is at least partially evaporated in the evaporation chamber of condenser-evaporator (14). A portion (18) of nitrogen-rich liquid (15, 16) from condenser-evaporator (14) is drawn off at least at times as liquid product. A second oxygen-enriched gas (221, 521) is removed from one of columns (546) of the distillation system and/or from the evaporation chamber of condenser-evaporator (14), machine expanded(23), and heated in main heat exchanger (2).

Abstract: For obtaining gaseous nitrogen by low-temperature separation from air, a distillation column system has a single column (4). Compressed air (1) is cooled in a main heat exchanger (2) and fed (3) to single column (4). A nitrogen-rich fraction (5, 7, 8) is drawn off from the distillation column system and compressed at least in part in a circulation compressor (9, 1063). A first part (12, 13) of nitrogen-rich fraction (5, 7, 8) is fed downstream from circulation compressor (9) to the liquefaction chamber of a condenser-evaporator (14) and is condensed under a pressure higher than the operating pressure of single column (4), so to form nitrogen-rich liquid (15, 16). A liquid oxygen-enriched fraction (231) from the distillation column system is at least partially evaporated in the evaporation chamber of condenser-evaporator (14). A first oxygen-enriched gas (234, 533) formed in the evaporation chamber of condenser-evaporator (14), is introduced into single column (4).

Abstract: For the indirect heat-exchange of a plurality of gas streams (14, 15, 16) with a heat-cold carrier (2, 7) in heat-exchange blocks (23a, b, c, d, e) in which the gas streams (14, 15, 16) are passed through a multiplicity of heat-exchange passages, only one of the gas streams (14, 15, 16) is passed in this case through at least one heat-exchange block (23a, b, c, d, e). The heat-exchange passages of the heat-exchange block (23a, b, c, d, e), through which this gas stream (14, 15, 16) flows end at two end surfaces of the heat-exchange block (23a, b, c, d, e). The gas stream (23a, b, c, d, e) is fed to an taken off from these heat-exchange passages via in each case a collector/distributor (41) connected to the heat-exchange block (23a, b, c, d, e), which collector/distributor extends in each case over the entire end surface of the heat-exchange block (23a, b, c, d, e).

Abstract: The process and the apparatus are used for the low-temperature fractionation of air in a three-column system which has a high-pressure column (5), a low-pressure column (7) and a medial column (6). Charge air (1, 2, 4) is introduced into the high-pressure column (5), where it is separated into a first oxygen-enriched liquid and a first nitrogen fraction (16). At least a part (19) of the first nitrogen fraction (16) is condensed in a first condenser/evaporator (8) to form a first liquid nitrogen fraction (20). A first oxygen-enriched fraction (22) from the high-pressure column (5) is introduced into the medial column (6), where it is separated into a second oxygen-enriched liquid and a second nitrogen fraction (24). At least a part of the second nitrogen fraction (24) is condensed in a second condenser/evaporator (25) to form a second liquid nitrogen fraction (26) and is added as reflux to one of the columns of the three-column system and/or is obtained as liquid product (64).

Abstract: For adjusting the capacity of a low-temperature rectification unit having a high pressure column and a low pressure column in which a fluid is introduced into the high pressure column (1) and in which liquid from the bottom of the high pressure column is directed into the low pressure column (2), the amount of liquid that is removed from the bottom of high pressure and fed to the low pressure column (2) is controlled via flow adjustment (4), wherein a nominal value for flow adjustment (4) is set to a desired amount of flow, and the liquid level of the liquid at the bottom of column (1) that operates at higher pressure is fixed without a set nominal value corresponding to the amount of liquid that is removed.