| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for separating air capable of reducing the rate of consumption of power and of collecting argon. SOLUTION: Stock air is partly liquefied on an air condensation passage 51 and is separated into nitrogen rich air and oxygen argon rich air (1). The nitrogen rich air is distilled on a nitrogen distillation passage 52 and is separated into product middle pressure nitrogen where nitrogen is concentrated and nitrogen contents where nitrogen concentration is low (2). The nitrogen contents and the oxygen argon rich air are distilled in a nitrogen distillation tower 6, and are separated to product low pressure nitrogen where nitrogen is concentrated and argon containing coarse oxygen where oxygen and argon are concentrated (3). The argon containing coarse oxygen is distilled on an oxygen distillation passage 53, and is separated to an argon oxygen stock (4). The argon oxygen stock is distilled in an argon distillation tower 7, and is separated to an argon condensate and product liquefied oxygen (5). |
