超微孔碳吸附剂实现天然气中丙烷和乙烷的高选择性提取  

Extraction of propane and ethane from natural gas on ultramicroporous carbon adsorbent with record selectivity

作　　者：陈富强 郭凯晴 黄鑫磊 张治国 杨启炜 杨亦文 任其龙 鲍宗必 Fuqiang Chen;Kaiqing Guo;Xinlei Huang;Zhiguo Zhang;Qiwei Yang;Yiwen Yang;Qilong Ren;Zongbi Bao(Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;Institute of Zhejiang University-Quzhou,Quzhou 324000,China;Hangzhou Oxygen Plant Group Co.,Ltd.,Hangzhou 310014,China)

机构地区：[1]Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China [2]Institute of Zhejiang University-Quzhou,Quzhou 324000,China [3]Hangzhou Oxygen Plant Group Co.,Ltd.,Hangzhou 310014,China

出　　处：《Science China Materials》2023年第1期319-326,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(21878260,21978254,and 22141001)。

摘　　要：轻烃混合物分离以及从天然气中提取C3H8和C2H6对天然气纯化及劣质天然气升级意义重大.微孔碳吸附剂在轻烃分离中潜力巨大,然而构筑孔径均一的超微孔从而增强分离选择性仍是巨大挑战.在本文中,我们采取无活化剂热解法制备了一系列孔径均一(5.2到5.3?)的聚偏二氯乙烯树脂(PVDC)衍生的超微孔碳吸附剂.与已报道的吸附剂相比,优选的C-PVDC-800对C3H8/CH4及C2H6/CH4在298 K和1.0 bar下表现出更高的理想吸附溶液理论(IAST)选择性(分别为3387和75),对C3H8/CH4具有最高的Henry系数选择性(369).此外,C-PVDC-800在低压下对C3H8和C2H6具有极高的吸附量.更重要的是,该材料对所有气体分子都实现了快速的动力学吸附,有利于应用于固定床吸附过程.固定床穿透实验及循环测试进一步证实了该材料从天然气中选择性提取C3H8和C2H6的优异性能.The separation of light hydrocarbon mixtures and the extraction of C3H8and C2H6from natural gas are of significant importance in natural gas purification and upgrading.Microporous carbon adsorbents are promising in light hydrocarbon separation.However,the fabrication of uniform ultramicropores to boost separation selectivity remains challenging.Herein,we fabricated a series of poly(vinylidene chloride)-resin-derived ultramicroporous carbon adsorbents with a relatively uniform pore size(5.2±5.3?)by activator-free pyrolysis.The optimal C-PVDC-800 exhibited record-high ideal adsorption solution theory(IAST)selectivity for C3H8/CH4(3387)and C2H6/CH4(75)and Henry’s selectivity for C3H8/CH4(369)among all reported adsorbents under ambient conditions,combined with ultrahigh uptake of C3H8(3.9 mmol g^(-1),0.05 bar)and C2H6(2.67 mmol g^(-1),0.10 bar)at low partial pressures and 298 K.More importantly,fast gas adsorption kinetics favorable for fixed-bed adsorption applications was realized.Breakthrough experiments and cycling tests further confirm the superb separation performance of the extraction of C3H8and C2H6from natural gas.

关 键 词：分离选择性 超微孔 热解法 穿透实验 轻烃分离 混合物分离 循环测试 动力学吸附 

分 类 号：TE646[石油与天然气工程—油气加工工程]