Preliminary study on the effectiveness of three separation and enrichment methods for gaseous 14C effluent
Objective To investigate the separation efficiency of three physical separation methods for gaseous 14C,namely membrane separation,adsorption separation,and low-temperature separation,to screen for the optimal separation method,and to provide a reference for the separation and enrichment of 14CO2 in online monitoring of 14C.Methods The experimental plan was designed,and three devices were constructed for separation and purification experiments.The purity,recovery rate,and separation time of CO2 separated by the three methods were analyzed.Results All the three methods achieved the separation of CO2.Under certain conditions,20 mL of sample gas was obtained.The separation time of mem-brane separation method was 0.5 hour,CO2 gas with a sample purity of 0.0486%-0.0488%VOL was obtained,and the re-covery rate was only 2.5%-12.7%.The separation time of MOF material adsorption separation method was 24-30 hours,CO2 gas with a sample purity of 20.2%-47.5%VOL was obtained,and the recovery rate was 57.3%-63.2%.The separation time of low-temperature separation method was 3 hours,CO2 gas with a sample purity of 96.0%-99.8%VOL was obtained,and the recovery rate was 81.5%-92.5%.Conclusion The purity and recovery rate of CO2 with low-temperature separa-tion method were higher compared to membrane separation method and MOF material adsorption separation method.The separation time of low-temperature separation method was moderate.The low-temperature separation method can provide a reference for the enrichment technology of 14C in the rapid measurement of gaseous 14C effluent.
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