Patent ID: 8623120

Claim:
An apparatus for separating and recovering sulfur hexafluoride (SF 6 ), comprising: a gas pretreatment device removing sulfur dioxide (SO 2 ) and moisture included in an SF 6 -containing waste gas; a first SF 6 concentrating device adsorbing SF 6 included in the waste gas with an adsorbent and desorbing SF 6 gas from the adsorbent; a first separation membrane module separating the waste gas exhausted from the first SF 6 concentrating device into a first recovered gas and a first remnant gas; a second separation membrane module separating the first recovered gas into a second recovered gas and a second remnant gas; a remnant gas storage tank storing the first remnant gas separated by the first separation membrane module; and a third separation membrane module receiving the first remnant gas from the remnant gas storage tank and separating the first remnant gas into SF 6 and the remaining gas, wherein the first recovered gas and the second recovered gas respectively contain higher concentration of SF 6 than the first remnant gas and the second remnant gas.