Preliminary study on the effectiveness of three separation and enrichment methods for gaseous 14C effluent
10.13491/j.issn.1004-714X.2024.04.003
- VernacularTitle:三种分离富集气态14C流出物方法的效果初步探讨
- Author:
Yanbiao ZHANG
1
;
Chuangao WANG
1
;
Luzhen GUO
1
;
Mengmeng WU
1
;
Hongchao PANG
1
;
Zhiping LUO
1
;
Ling CHEN
1
Author Information
1. China Institute of Atomic Energy, Beijing 102413 China.
- Publication Type:OriginalArticles
- Keywords:
Separation;
Gaseous 14C;
Purity;
Recovery rate;
Time;
Online monitoring
- From:
Chinese Journal of Radiological Health
2024;33(4):364-369
- CountryChina
- Language:Chinese
-
Abstract:
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 membrane separation method was 0.5 hour, CO2 gas with a sample purity of 0.0486%-0.0488%VOL was obtained, and the recovery 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 separation 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.
