Patent ID: 6702874
Filing Date: 2004-03-09
Classification: B01D,Y02C

Abstract:
A gas separation method for separating at least two specific gases from a gas to be treated containing a plurality of specific gases, said method comprising the steps of:a first separation step for separating said gas to be treated into gas groups having different boiling points by distillation separation; and a second separation step for separating the at least two specific gases by performing chromatographic separation on at least one gas group that is separated through distillation at the first separation step, wherein the second separation step comprises sequentially supplying a plurality of chromatographic columns with the at least one gas group by switching an inlet valve for each of the plurality of chromatographic columns and sequentially collecting the at least two specific gases from the plurality of chromatographic columns by switching a plurality of outlet valves, wherein, for at least one of the plurality of chromatographic columns, the plurality of outlet valves comprises a first outlet valve, a second outlet valve, and a third outlet valve, wherein, a first gas of the at least two specific gases is collected from the first outlet valve, a second gas of the at least two specific gases is collected from the second outlet valve, and a mixture gas of the at least two specific gases is collected from the third outlet valve.