一维直孔道MOFs对CH4/N2和CO2/CH4的分离

doi:10.11949/j.issn.0438-1157.20150892

化工学报 ›› 2015, Vol. 66 ›› Issue (9): 3549-3555.DOI: 10.11949/j.issn.0438-1157.20150892

一维直孔道MOFs对CH₄/N₂和CO₂/CH₄的分离

张倬铭, 杨江峰, 陈杨, 王勇, 李立博, 李晋平

太原理工大学精细化工研究所, 山西太原 030024

收稿日期:2015-06-09 修回日期:2015-06-16 出版日期:2015-09-05 发布日期:2015-09-05
通讯作者: 李晋平
基金资助:
国家自然科学基金项目(21136007,51302184);国家重点基础研究发展计划项目(2014CB260402);山西省自然科学基金项目(2014021036-1)。

Separation of CH₄/N₂ and CO₂/CH₄ mixtures in one dimension channel MOFs

ZHANG Zhuoming, YANG Jiangfeng, CHEN Yang, WANG Yong, LI Libo, LI Jinping

Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

Received:2015-06-09 Revised:2015-06-16 Online:2015-09-05 Published:2015-09-05
Supported by:
supported by the National Natural Science Foundation of China (21136007, 51302184), the National Basic Research Program of China (2014CB260402) and the Natural Science Foundation of Shanxi Province, China (2014021036-1).

摘要/Abstract

摘要：

非常规天然气未来可以作为常规天然气的有效补充,其中低浓度煤层气和生物质燃气分别需要脱除大量的N₂ 和CO₂以达到富集和纯化CH₄的目的。本研究针对CH₄/N₂这一对较难分离的气体组合,选取了具有一维菱形孔道的MOFs材料Cu(INA)₂作为吸附剂,将合成的样品做了XRD和TG表征,测试了纯气体CO₂、CH₄和N₂的吸附曲线,利用巨正则系综蒙特卡罗(GCMC)分子模拟和理想吸附溶液理论(IAST)计算了气体的吸附热和该材料对于CH₄/N₂和CO₂/CH₄的吸附选择性系数;3 MPa压力下制备的颗粒样品填装吸附分离装置,进行了混合气体CH₄/N₂ (50%/50%)和CO₂/CH₄ (50%/50%)的穿透试验,分离的结果显示,Cu(INA)₂不仅高选择性地吸附CH₄/N₂混合物中的CH₄(S_CH_4/N2=10),而且对CH₄/N₂的分离效果优于CO₂/CH₄。

关键词: 甲烷, 分离, 吸附剂, 金属有机骨架, 吸附选择性, 穿透试验

Abstract:

As powerful and effective supplement to conventional natural gas in future, the unconventional gas including low concentration coalbed methane and biomass need to remove a large amount of N₂ and CO₂ to achieve enrichment and purification of CH₄. To separate N₂ and O₂, Cu(INA)₂ with pores of a one-dimensional rhombus was chosen as an adsorbent. The synthesized sample was characterized with XRD and TG. Combined with CO₂, CH₄ and N₂ adsorption curves, the grand canonical ensemble Monte Carlo (GCMC) molecular modeling and the ideal adsorbed solution theory (IAST) were used to calculate the adsorption heat of gas and adsorption selectivities for binary mixtures (CH₄/N₂ and CO₂/CH₄), separately; For breakthrough separation experiments, powder samples of Cu(INA)₂ were pelletized into particles of a certain size under pressure of 3 MPa. The result revealed that Cu(INA)₂ has not only high selective adsorption of CH₄ in mixture of CH₄/N₂ (S_CH_4/N2=10), but also better separation for CH₄/N₂ than CO₂/CH₄.

Key words: methane, separation, adsorbents, metal-organic frameworks, adsorption selectivity, breakthrough test

中图分类号:

TQ424

张倬铭, 杨江峰, 陈杨, 王勇, 李立博, 李晋平. 一维直孔道MOFs对CH₄/N₂和CO₂/CH₄的分离[J]. 化工学报, 2015, 66(9): 3549-3555.

ZHANG Zhuoming, YANG Jiangfeng, CHEN Yang, WANG Yong, LI Libo, LI Jinping. Separation of CH₄/N₂ and CO₂/CH₄ mixtures in one dimension channel MOFs[J]. CIESC Journal, 2015, 66(9): 3549-3555.

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一维直孔道MOFs对CH₄/N₂和CO₂/CH₄的分离

Separation of CH₄/N₂ and CO₂/CH₄ mixtures in one dimension channel MOFs

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