What are the difficulties in sulfur hexafluoride recovery and purification?For the decomposition of sulfur hexafluoride,some can be absorbed by adsorbent,and some can be removed by chemical reaction with acid solution or alkali solution.The process of removing the decomposition by various methods is called the purification of sulfur hexafluoride.

　　The difficulty of SF6 purification lies in the removal of air and CF4.At present,sulfur hexafluoride recovery and purification technologies mainly include physical liquefaction separation,cryocuring separation,pressure swing adsorption separation and so on.

　　Cryogenic curing separation is mainly the use of high pure nitrogen or mechanical refrigeration to first freeze SF6 into a solid at low temperature,and then use vacuum to remove the uncondensed air and CF4;Physical liquefaction is mainly to use the boiling point of sulfur hexafluoride is higher than air,CF4,is easy to be liquefied principle to achieve the recovery of sulfur hexafluoride purification.

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