Abstract: As a non-renewable strategic rare gas, helium mainly comes from helium containing natural gas, which is generally purified by cryogenic technology. However, the cost of helium obtained by cryogenic method is high. In order to reduce the extraction cost of helium, the traditional cryogenic technologies such as pressure swing adsorption, membrane separation, absorption method, hydrate method and multi-technology combination methods were analyzed and compared. The results show that the multi-technology combination extraction and separation of helium can effectively break the "bottleneck" of single separation technology, reduce investment and consumption, and has a better application prospect.

Key words: helium, purification, cryogenic distillation, pressure swing adsorption, membrane separation