Experiments and simulations on separating a CO2/CH4 mixture using K-KFI at low and high pressures
Experiments and simulations on separating a CO2/CH4 mixture using K-KFI at low and high pressures
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DOI：
10.1016/j.micromeso.2013.09.026
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发表时间：
2014-01
影响因子：
5.2
通讯作者：
Jiangfeng Yang;R. Krishna;Junmin Li;Jinping Li
中科院分区：
文献类型：
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作者：
Jiangfeng Yang;R. Krishna;Junmin Li;Jinping Li
为了利用低质量的沼气或垃圾填埋气并减少温室气体排放，需要将CO2与CH 4分离。为了研究CO2/CH 4混合气体的分离，合成了K-KFI（Si/Al = 4.59）吸附剂并制成颗粒。我们在环境温度和压力（298 K，100 kPa）下，在16.6和30 N mL/min的流速下进行了突破实验。穿透实验结果表明，K-KFI对40%/60%的CO2/CH 4混合气体的分离效果优于50%/50%的混合气体。在相同条件下，K-KFI的分离性能上级优于商品吸附剂沸石-5A和13 X。模拟的突破二元混合气体CO2/CH 4 = 40%/60%，产量的结果是在很好的协议与我们的实验数据。通过在2 MPa的总压下进行穿透模拟，我们证明了纯CH 4可以在高压下从CO2/CH 4气体混合物中分离，并且纯CH 4可以在穿透的初始阶段被回收。
Separation of CO2from CH4is needed in order to use low-quality biogas or landfill gas and to reduce greenhouse gas emissions. To study the separation of a CO2/CH4gas mixture, K-KFI (Si/Al = 4.59) sorbent was synthesized and pelletized. We performed breakthrough experiments at flow rates of 16.6 and 30 N mL/min under ambient temperature and pressure (298 K, 100 kPa). The breakthrough experiments results showed that K-KFI separated a 40%/60% mixture of CO2/CH4better than a 50%/50% mixture. Furthermore, the separation performance of K-KFI is superior to that of commercial sorbents zeolite-5A and 13X under the same conditions. Simulations of the breakthrough of binary mixed gases CO2/CH4= 40%/60%, yield results that are in good agreement with our experimental data. By performing breakthrough simulations at a total pressure of 2 MPa, we demonstrated that pure CH4can be separated from CO2/CH4gas mixtures under high pressure, and that pure CH4can be recovered in the initial stages of the breakthrough.