| 摘要 |
An air liquefaction separation installation is provided with a rectification column which have a carbon monoxide rectification part connected to the upper part of the rectification column and at upper part of its rectification parts or a main condensation evaporator, a collecting part is provided for withdrawing a part of nitrogen gas having reduced amount of carbon monoxide and/or liquified nitrogen; and a carbon monoxide-containing nitrogen gas withdrawal part and/or liquefied nitrogen gas withdrawal part, connected to the lower part of the carbon monoxide rectification part. According to the present invention, carbon monoxide is removed from nitrogen by a rectification process. Accordingly, cost for installation and operation can be reduced.
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