TARGET GAS SEPARATION METHOD AND TARGET GAS SEPARATION DEVICE

摘要

A method for separating a target gas from a gas mixture is performed by using at least three adsorption columns containing an adsorbent. In this method, in each of the adsorption columns, a cycle is repeated which includes an adsorption step of introducing the gas mixture into the adsorption column to adsorb the target gas in the gas mixture to the adsorbent while discharging non-adsorbed gas from the adsorption column, a rinsing step of introducing rinsing gas into the adsorption column to discharge rinsing off-gas from the adsorption column, and a desorption step of reducing the pressure inside the adsorption column to desorb the target gas from the adsorbent and discharging the desorbed gas from the adsorption column. The adsorption step is constantly performed in any one of the adsorption columns throughout the cycle. The desorption time for performing the desorption step is made longer than adsorption time for performing the adsorption step.