From into the primary heat

摘要

PROBLEM TO BE SOLVED: To provide an air separator capable of producing efficiently oxygen and nitrogen of high purity in parallel, while reducing a power consumption.;SOLUTION: Compressed, refined and cooled raw air is distilled in an air distillation passage 15a of a heat exchange type distiller 15 to be separated into a nitrogen concentrate and oxygen-enriched liquefied air, the nitrogen concentrate is distilled in a high-purity nitrogen tower 16 to be separated into the nitrogen of high purity and liquefied nitrogen of low purity, the distillate in the heat exchange type distiller and the liquefied nitrogen of low purity are distilled in a distillation tower 18 to be separated into nitrogen of high purity and crude liquefied oxygen, and the crude liquefied oxygen is distilled in the air distillation passage 15a of the heat exchange type distiller 15 to obtain liquefied oxygen.;COPYRIGHT: (C)2007,JPO&INPIT