离子交换改性斜发沸石用于分离性能研究N_2/CH_4  

The clinoptilolite modified by different ion-exchange to separation N_2/CH_4 mixture gas

作　　者：金淑明[1] 刘秀伍[1] 王桂香[1] 王亮[1] 

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《河北工业大学学报》2012年第2期32-35,共4页Journal of Hebei University of Technology

基　　金：河北省自然科学基金(B2008000023);河北省教育厅自然科学基金(2006332);河北省科技支撑计划项目(07215151)

摘　　要：抽放煤层气的主要成分为氮气和甲烷,采用以N2为强吸附组分的天然斜发沸石进行变压吸附分离(PSA),CH4成为塔顶产品,其回收率和纯度会大大提高.首先对4种国内不同地区的斜发沸石进行筛选,结果表明1#斜发沸石氮气吸附量大于甲烷,为氮气选择性吸附剂.为了进一步提高1#斜发沸石的氮气选择性能,对其进行离子交换改性研究,发现在室温下交换3次的Na-Cp-1分离效果最好,氮气/甲烷分离因子达5.48,是非常好的氮选择性吸附剂;而Li+、K+、NH4+、Ca2+、Mg2+、Sr2+离子交换后斜发沸石对N2和CH4的吸附差异较小.The separation between CH4 and N2 has been considered a real challenge for the community of adsorption, as CH4 and N2 gas have similar physicochemical properties; therefore, the coal-bed gas, whose main components are methane and nitrogen, is difficult to separation and purification. The clinoptilolite as adsorbent to separation coal-bed gas has a promising future, because CH4 gas can be obtained directly as product gas by PSA. To improve NJCH4 separation selectivity, different ion-exchange clinoptilolites were studied. The clinoptilolite exchanged by Na＋ at room temperature for three times has the best separation performance, and its separation factor of NJCH4 has reached 5.48. The clinoptilolites exchanged by other ion, such as Li~, K~, NH~, Ca2＋, Mg2~, and Sff~, are methane selectivity and have small adsorption difference between N2 and CH4, SO those adsorbents are not suitable as coal-bed gas adsorbent to separate nitrogen and methane mixture gas.

关 键 词：离子交换 斜发沸石 煤层气 吸附分离 分离因子 

分 类 号：O647.32[理学—物理化学]