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- 2016
沸石分子筛的CO2除杂性能
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Abstract:
放射性氙测量通常采用碳分子筛等吸附剂进行吸附分离以提高探测灵敏度，但空气中CO2的存在会降低吸附剂的吸附性能，同时增大吸附柱的体积、降低气体回收率，因此在氙吸附前需要去除空气中的CO2。该文研究了不同的沸石分子筛的CO2除杂性能，测试分析了不同操作条件对除杂性能的影响。结果表明：13XHP沸石分子筛对CO2的除杂性能较好，温度和CO2的体积分数对吸附剂性能的影响最为显著，柱前压力和气体流量分别在103~353 kPa和564~2015 mL/min的范围内对吸附剂性能影响不大。
Abstract：Adsorption and separation by carbon molecular sieves is improves the detection sensitivity of radio xenon measurements. However, the adsorption capability including the adsorption column volume and the gas recovery are influenced by the CO2 in the air. Therefore, the CO2 must be removed before the xenon adsorption. This study analyzed CO2 removal by zeolite molecular sieves for various operating conditions. The results show that the 13XHP zeolite molecular sieve more effectively removes CO2 than the other adsorbents and that the CO2 temperature and volume fraction are the most important of fact affecting the adsorption performances. The inlet pressure and flow rate have less effect on the adsorption of CO2 by 13XHP for how rates of 564-2 015 mL/min and pressures of 103-353 kPa.
| [1] | Wood G O.Quantification and application of skew of breakthrough curves for gases and vapors eluting from activated carbon beds[J].Carbon,2002,40:1883-1890. |
| [2] | Nakayama Y,Nagao H,Mochida I,et al.Adsorption of radon on active-carbon[J].Carbon,1994,32:1544-1547. |
| [3] | Siegworth D P,Neulander C K,Pao R T,et al.Measurement of dynamic adsorption coefficients for noble gases on activated carbon[C]//Proceedings of the 12th AEC Air Cleaning Conference.San Jose,CA,USA:National Technical Information Service,1972:28-47. |
| [4] | Adams R E,Browning W E.Ackley R D,et al.Containment of radioactive fission gases by dynamic adsorption[J].Ind Eng Chem,1959,51:1467-1470. |
| [5] | ZHOU Chongyang,ZHOU Guoqing,FENG Shujuan,et al.The determination of trace amount of natural <sup>133</sup>Xe in gas under high radon activity concentration levels[J].J Environ Radioactivity,2013,122:9-15. |
| [6] | 冯淑娟,周崇阳,周国庆,等.氙在活性炭和碳分子筛上的动态吸附性能[J].核化学与放射化学,2010,32(5):274-279.FENG Shujuan,ZHOU Chongyang,ZHOU Guoqing,et al.Dynamic adsorption property of xenon on activated carbon and carbon molecular sieves[J].Journal of Nuclear and Radiochemistry,2010,32(5):274-279.(in Chinese) |
| [7] | 周崇阳.大气样品中氙的富集分离技术研究[D].北京:清华大学,2011.ZHOU Chongyang.Study on the Technology of Xenon Enrichment and Separation from Atmosphere and its Application in Nuclear Inspection[D].Beijing:Tsinghua University,2011.(in Chinese) |
| [8] | Cavenati S,Grande C A,Rodrigues A E.Adsorption equilibrium of methane,carbon dioxide,and nitrogen on zeolite 13X at high pressure[J].J Chem Eng Data,2004,49(4):1095-1101. |
| [9] | ZHOU Chongyang,FENG Shujuan,ZHOU Guoqing,et al.The behavior of xenon dynamic adsorption on granular activated carbon packed bed adsorber[J].J Radional Nucl Chem,2011,287:609-616. |
| [10] | 龙斌,吴睿,成智威,等.放射性氙测量中的天然源γ谱仪校准技术[J].原子能科学技术,2014,48(1):137-141.LONG Bin,WU Rui,CHENG Zhiwei,et al.Natural source-based calibration technique for measurement of radio-xenon with γ spectrometry[J].Atomic Energy Science and Technology,2014,48(1):137-141.(in Chinese) |
| [11] | 王璐.沸石13XAPG吸附分离CO<sub>2</sub>-N<sub>2</sub>混合气过程研究及其应用[D].上海:华东理工大学,2013.WANG Lu.Investigation and Application of CO<sub>2</sub>/N<sub>2</sub> Separation by Adsorption Process using Zeolite 13XAPG[D].Shanghai:East China University of Science and Technology,2013.(in Chinese) |
| [12] | LIU Zhen,Grande C A,LI Ping,et al.Adsorption and desorption of carbon dioxide and nitrogen on zeolite 5A[J].Sep Sci Technol,2011,46(3):434-451. |
| [13] | Wood G O.A review of the effects of covapors on adsorption rate coefficients of organic vapors adsorbed onto activated carbon from flowing gases[J].Carbon,2002,40:685-694. |
