Method and apparatus for recovering condensable gas from mixed gas

摘要

A method for recovering a condensable gas from a mixed gas uses a condensable gas recovering apparatus (100). The apparatus (100) comprises a compressor (103) for compressing a mixed gas comprising a condensable gas and an incondensable gas, a mixed gas separator (200a or 200b) including a cooler (204) and an adsorbent (202) that adsorbs the incondensable gas, and a vacuum exhauster (207). The method comprises the steps of introducing the mixed gas highly compressed by the compressor (103) into the mixed gas separator (200a or 200b), liquefying and recovering the condensable gas by cooling the mixed gas separator (200a or 200b) with the cooler (204) while the adsorbent (202) adsorbs the incondensable gas contained in the mixed gas in a high pressure state, and exhausting the incondensable gas from the adsorbent (202) in a low pressure state where the gas in the mixed gas separator (200a or 200b) has been exhausted by the vacuum exhauster (207). Therefore, recovery of the condensable gas is carried out with high reliability, and mixing of a large quantity of the condensable gas into the incondensable gas is easily prevented.