Refrigerant recovery device and refrigerant recovery method

A refrigerant recovery system (90A) comprises an extraction pipe (61), a stabilizer holding container (70), a recovery pipe (62), a recovery container (80), and a recovery device (85). The extraction pipe (61) can be connected to a refrigerant extraction port (18) of an air conditioning device (100). The stabilizer holding container (70) is connected to the extraction pipe (61) and holds a stabilizer (A). The stabilizer holding container (70) brings refrigerant that is guided into the extraction pipe (61) into contact with the stabilizer (A). The recovery pipe (62) guides refrigerant that is expelled from the stabilizer holding container (70). The recovery container (80) is connected to the recovery pipe (62) and recovers refrigerant that is guided into the recovery pipe (62). The recovery device (85) transfers refrigerant from the refrigerant extraction port (18) to the recovery container (80). The refrigerant includes a compound that is expressed by a molecular formula having one or more carbon-carbon unsaturated bonds.