Gas separation and recovery method and facility

A gas separation and recovery method for separating and recovering a target gas component from a source gas by pressure swing adsorption, comprising:

• an adsorption step of causing gas components to adsorb to an adsorbent packed in an adsorbent vessel, and
• a desorption step of desorbing the gas components adsorbed to the adsorbent in the adsorption step and recovering the desorbed gases, wherein
• the method does not include a rinse step in which part of desorbed gas from other adsorbent vessel is supplied as a rinse gas, and
• the desorption step is divided into a plurality of time periods and the desorbed gases are recovered in the respective time periods.

A gas separation and recovery facility for separating and recovering a target gas component from a source gas by pressure swing adsorption, wherein

• the gas separation and recovery facility is configured to perform steps comprising:
• an adsorption step of causing gas components to adsorb to an adsorbent packed in an adsorbent vessel, and
• a desorption step of desorbing the gas components adsorbed to the adsorbent in the adsorption step and recovering the desorbed gases,
• the steps not including a rinse step in which part of desorbed gas from other adsorbent vessel is supplied as a rinse gas,
• and wherein the gas separation and recovery facility comprises a desorbed gas outlet line forked into a plurality of branch lines, the branch lines each having an on-off valve, and allows the gases desorbed in the desorption step to be recovered separately through respective branch lines in different time periods.