Abstract:
Objective Given the rapidly growing domestic demand for high-purity helium (≥99.999% by volume) and the high efficiency of helium extraction from liquefied natural gas (LNG) flash gas, it is necessary to investigate methods for removing neon impurities from helium to enhance its purity.
Method A comparative analysis was conducted on three neon removal processes, including cryogenic separation, distillation, and adsorption. Experimental investigations focused on the purification performance of physical adsorption on activated carbon for neon removal at cryogenic temperatures of 30 ± 5 K over a continuous 40-hour operation.
Result Under experimental conditions, the adsorption capacity of activated carbon for neon was significantly enhanced. Chromatographic analysis revealed that the cryogenic adsorption process exhibited high operational flexibility, with temperature and pressure fluctuations having minimal impact on adsorption efficiency. During the temperature ramping desorption stage, the desorption temperatures of various gaseous impurities showed regular trends, with neon exhibiting pronounced progressive desorption in the temperature range of 100-170 K.
Conclusion The results demonstrate the potential of cryogenic activated carbon adsorption for achieving efficient neon-helium separation. The findings provide a theoretical basis and experimental reference for developing high-purity helium purification processes suitable for large-scale automated production, with simple equipment structures and low operating costs.
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