Abstract: The device serves for the cryogenic separation of air. It comprises a main heat exchanger (6) and a distillation column system for nitrogen-oxygen separation (5) with a double column (5), which contains a high-pressure column and a low-pressure column. The device also includes a mixing column (1) and means for introducing charge air via the main heat exchanger (6) into the high-pressure column and into the mixing column. A liquid oxygen line serves for introducing liquid oxygen from the low-pressure column into the upper region of the mixing column (1), an oxygen product line serves for extracting oxygen gas from the upper region of the mixing column (1) through the main heat exchanger (6). The mixing column (1) and the double column (5) are arranged in a common cold box (3). The mixing column (1) is attached to the double column (5) by way of connecting elements (10, 11).

Abstract: The invention relates to a transportable package for a low-temperature air separation plant which has a main heat exchanger (2a, 2b, 2c) for cooling feed air (1) and a double column (5) for separating the cooled feed air, wherein the double column (5) has a high-pressure column and a low-pressure column that are arranged above one another. The transportable package has a cold box (20, 400), in the interior of which accessories of the double column (5), in particular pipelines (7, 11, 12) and valves, are arranged, but not the double column and not the main heat exchanger, wherein the transportable package has connections for joining the pipelines to the double column and to the main heat exchanger. Moreover the invention relates to a low-temperature air separation plant and to a method for producing a low-temperature air separation plant using this transportable package.

Abstract: The invention relates to a transportable package with a cold box, in the interior of which at least one double column of a low-temperature air separation system is arranged, i.e., a double column having a high-pressure column and a low-pressure column. The high-pressure and low-pressure columns contain mass transferring elements. The mass transferring elements in at least one sub-region of the low-pressure columns are formed by an ordered packing made of folded metal sheets having a thickness of 0.2 mm or less. The ordered packing has a specified surface area of at least 1000 m2/m3. At least in a sub-region of the high-pressure column, the mass transferring elements are formed by rectifying plates arranged one over the other and which have a clearance of less than 195 mm. The invention further relates to a method for producing a low-temperature air separation system using such a transportable package.

Abstract: The device serves for the cryogenic separation of air. It has the following features: a main heat exchanger and a supercooling countercurrent heat exchanger (2); a distillation column system for nitrogen-oxygen separation (5), which comprises a high-pressure column and a low-pressure column; a mixing column (1); means for introducing charge air via the main heat exchanger into the high-pressure column and into the mixing column; a liquid-oxygen line for introducing liquid oxygen from the low-pressure column into the upper region of the mixing column; an oxygen product line for extracting oxygen gas from the upper region of the mixing column through the main heat exchanger. The mixing column (1) and at least one of the two heat exchangers mentioned (2, 6) are arranged in a common cold box (3).

Abstract: The device serves for the cryogenic separation of air. It comprises a main heat exchanger (6) and a distillation column system for nitrogen-oxygen separation (5) with a double column (5), which contains a high-pressure column and a low-pressure column. The device also includes a mixing column (1) and means for introducing charge air via the main heat exchanger (6) into the high-pressure column and into the mixing column. A liquid oxygen line serves for introducing liquid oxygen from the low-pressure column into the upper region of the mixing column (1), an oxygen product line serves for extracting oxygen gas from the upper region of the mixing column (1) through the main heat exchanger (6). The mixing column (1) and the double column (5) are arranged in a common cold box (3). The mixing column (1) is attached to the double column (5) by way of connecting elements (10, 11).

Abstract: The process and the apparatus in accordance with the invention relate to cryogenic separation of air in a distillation column system that has at least one single column (12). A compressed feed air stream (6, 8) is cooled in a main heat exchanger (9) in counter-current flow to a first return stream (16, 23) from the distillation column system. Cooled feed air stream (11) is fed into the distillation column system. A nitrogen-rich fraction (15) is produced in the upper region of the single column (12). At least part (16b) of the nitrogen-rich fraction (15) is condensed in a top condenser (13), which is constructed as a condenser-evaporator. At least part (54) of the liquid nitrogen-rich fraction (52) produced in the top condenser (13) is fed into the single column (12) as reflux. An oxygen-containing recycle fraction (18a) is drawn off from the single column (12) in liquid form. The liquid recycle fraction (18a) is cooled in a counter-current subcooler (100).

Abstract: In low-temperature air fractionation, feed air (8) is cooled in a main heat exchanger (9) and introduced into a distillation column system for nitrogen-oxygen separation (11, 43), which system has at least one single column (12). At least one nitrogen-enriched or oxygen-enriched product stream (15, 16, 17; 53; 51, 56, 57; 19, 60) is withdrawn from the distillation column system for nitrogen-oxygen separation and warmed in the main heat exchanger (9). A fluid from an external source is passed at least at times into a liquid tank (70). At least at times fluid (71) is withdrawn in the liquid state from the liquid tank (70), vaporized in the main heat exchanger (9) and is obtained as gaseous additional product (72, 73).

Abstract: The process and the device serve for low temperature air fractionation in a distillation column system for obtaining nitrogen which has a single column (12). Feed air (8) is cooled in a main heat exchanger (9) and introduced (11, 43) into the single column (12). The single column (12) has a top condenser (13) in which vapour from the upper region of the single column is at least in part condensed. A nitrogen product stream (15, 16, 17) is withdrawn from the upper region of the single column (12). A first residual fraction (14, 19) is withdrawn in the liquid state from the single column (12), at least in part vaporized in the top condenser (13) and subsequently taken off from the top condenser as vaporized first residual fraction (19). A first part (20) of the vaporized first residual fraction (19) is expanded in a work-producing manner in an expansion machine (21).

Abstract: The process and the apparatus are used for low-temperature air fractionation. Input air (8) is cooled in a main heat exchanger (9) and introduced into a single column (12) for obtaining nitrogen (11, 43). A nitrogen product stream (15, 16, 17) is removed from the upper region of the single column (12). A first residual fraction (18, 29) is removed from the lower or central region of the single column (12), re-compressed (30) and then fed to the single column (12) again (32). An oxygen-containing stream (36) is removed from the single column (12) at an intermediate point and fed to a pure oxygen column (38) (39). A pure oxygen product stream (41) in the liquid state is removed from the lower region of the pure oxygen column (38). The pure oxygen product stream (41, 56) is evaporated and warmed with respect to input air (8) in the main heat exchanger (9) and finally obtained as a gaseous product (57).

Abstract: The invention relates to a process and apparatus for producing nitrogen by low-temperature fractionation of air in a rectification system which has a high-pressure column (4) and a low-pressure column (5). Feed air (1, 3) is introduced into the high-pressure column (4). An oxygen-containing liquid fraction (11) is removed from the high-pressure column (4) and fed into the low-pressure column (5). Gaseous nitrogen (18) is extracted from the low-pressure column (5) above a mass transfer section (25), which has at least one theoretical or practical plate, and is at least partially condensed in a top condenser (17) by indirect heat exchange with a refrigerant (13). High-purity nitrogen is removed from the low-pressure column below the mass transfer section (25), and is obtained as a nitrogen product (26, 27, 30). The process and apparatus have a refrigeration-supply system, in which a refrigeration fluid (31) flows.

Abstract: The invention relates to a process and apparatus for producing nitrogen by low-temperature fractionation of air in a rectification system which has a high-pressure column (4) and a low-pressure column (5). Feed air (1, 3) is introduced into the high-pressure column (4). An oxygen-containing liquid fraction (11) is removed from the high-pressure column (4) and fed into the low-pressure column (5). Gaseous nitrogen (18) is extracted from the low-pressure column (5) above a mass transfer section (25), which has at least one theoretical or practical plate, and is at least partially condensed in a top condenser (17) by indirect heat exchange with a refrigerant (13). High-purity nitrogen is removed from the low-pressure column below the mass transfer section (25), and is obtained as a nitrogen product (26, 27, 30). The process and apparatus have a refrigeration-supply system, in which a refrigeration fluid (31) flows.

Abstract: High-purity nitrogen is generated by low-temperature fractionation of air in a rectification system for nitrogen/oxygen separation having at least a first rectifier column (4). Cycle nitrogen (24) in gas form is removed from the upper region of the first rectifier column (4) and is compressed in a cycle compressor (30). A first part (35) of the compressed cycle nitrogen is liquefied. A nitrogen fraction (52) from the rectification system for nitrogen/oxygen separation is introduced (52) into a high-purity nitrogen column (39) having a top condenser (54). High-purity nitrogen (56) is removed from the upper region of the high-purity nitrogen column (39). The refrigeration demand of the top condenser (54) is at least partially covered by liquefied cycle nitrogen (38).

Abstract: The process and the apparatus are used to generate high-purity nitrogen by low-temperature fractionation of air in a rectification system for nitrogen/oxygen separation which has at least a first rectifier column (4). Cycle nitrogen (24) in gas form is removed from the upper region of the first rectifier column (4) and is compressed in a cycle compressor (30). A first part (35) of the compressed cycle nitrogen is liquefied. A nitrogen fraction (52) from the rectification system for nitrogen/oxygen separation is introduced (52) into a high-purity nitrogen column (39) which has a top condenser (54). High-purity nitrogen (56) is removed from the upper region of the high-purity nitrogen column (39). The refrigeration demand of the top condenser (54) of the high-purity nitrogen column (39) is at least partially covered by liquefied cycle nitrogen (38).

Abstract: The process and the apparatus serve for producing pressurized oxygen and krypton/xenon by low-temperature fractionation of air. The rectifying system has a low-pressure column (3) for the nitrogen-oxygen separation and a krypton-xenon enrichment column (15). Compressed and prepurified feed air (4) is introduced into the rectifying system. A first oxygen fraction (11) is taken off from the low-pressure column (3), brought (12) to an elevated pressure in the liquid state, vaporized and removed as gaseous pressurized oxygen product (24). In addition, a second oxygen fraction (16) is taken off from the low-pressure column (3) and passed (18) into the lower or central region of the krypton-xenon enrichment column (15). The first oxygen fraction (11) is taken off at least one actual or theoretical plate above the bottom of the low-pressure column (3) and, after the pressure elevation (12) is introduced (14) in the liquid state into the upper region of the krypton-xenon enrichment column (15).

Abstract: A process and a system for the low-temperature separation of air by rectification is provided. A liquid fraction is obtained in a rectifying system, stored in a tank and at least a portion of the liquid fraction taken out of the tank and brought to an increased pressure. During normal operation, the liquid fraction, which was brought to an increased pressure, is heated in a preheat exchanger and evaporated in the main heat exchanger. During an operating disturbance, at least a portion of the liquid product is removed from the tank, evaporated and used for an emergency supply.