Separation of Methane/Ethylene Gas Mixtures Using Wet ZIF-8

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• 作者：Xiao-Xin Zhang ; Peng Xiao ; Chang-Hua Zhan ; Bei Liu ; Rui-Qin Zhong ; Lan-Ying Yang ; Chang-Yu Sun ; Huang Liu ; Yong Pan ; Guang-Jin Chen ; Nan Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：54
• 期：32
• 页码：7890-7898
• 全文大小：520K
• ISSN：1520-5045

文摘

The separation of methane/ethylene gas mixtures by the adsorption鈥揾ydration method was investigated by using a wet zeolitic imidazolate framework (ZIF) microporous material, ZIF-8. The influences of the initial gas鈥搒olid ratio (the volume ratio of gas mixture to ZIF-8) and water content of wet ZIF-8 on the separation performance were studied systematically at 274.15 K. The experimental results show that gas鈥搒olid ratio of ca. 310 and water content of ca. 38.50 wt % are the suitable conditions for the separation of methane/ethylene mixture with wet ZIF-8 on the premise of hydrate formation. When water content of wet ZIF-8 is 38.50 wt % and the gas鈥搒olid ratio is 297, the mole fraction of ethylene in gas phase decreases from 30.91% to 14.44%, the selectivity coefficient reaches 5.57, and the adsorption quantity of ethylene reaches 3.37 mmol/g after one stage of the adsorption鈥揾ydration process. Compared with a single adsorption method or hydration method, methane/ethylene gas mixtures can be further separated with the synergistic effect of gas adsorption and hydrate formation. The morphology and crystal structure of ZIF-8 remains after a series of processes of saturation with water, adsorption鈥揾ydration, hydrate decomposition, and drying.