聚酰亚胺中空纤维膜对CO_2、O_2、H_2O和Xe的分离性能

为了富集环境中的氙,使用中空纤维膜对气体进行预处理,去除掉大量的杂质气体,如氮气、氧气、二氧化碳和水蒸气,氙得以浓缩。为此,建立了膜分离实验装置,实验研究了不同的温度、流量、级切、膜数量、连接方式、气源压力等条件下聚酰亚胺中空纤维膜富集氙并去除CO_2、H_2O和O_2等杂质气体的性能。实验结果表明,气体流量和环境温度对膜的分离性能没有明显影响,采用3根或4根膜串联的方式时氙的损失率较小;在级切为2/3时,氙的损失率不大于10%,CO_2、H_2O和O_2的去除率分别不低于99%、90%和90%;空气样品氙的损失率略大于地表下气体样品。

Polyimide Hollow Fiber Membranes for CO2, O2, H2O Removal and Xe Enrichment

In order to enrich environmental xenon, hollow fiber membranes were used for gas sample pretreatment to remove the great deal of impurities such as nitrogen, oxygen, carbon dioxide and vapor, and enrich the xenon.An experimental apparatus was developed for researching the performance of impurities removal and xenon enrichment.The effect of temperature, flow rate, stage cut, membranes amount, connective form and gas origin was studied respectively.The results show that the gas flow rate and environmental temperature hardly influence the performance of membranes.The xenon loss rate is lesser when three or four membranes are connected in series.When the stage cut is 2/3, the xenon loss rate is no more than 10%, and the removal rates of CO2, H2O and O2 are no less than 99%, 90% and 90%, respectively.The xenon loss rate of the samples from surface air is slightly higher than that from subsurface.