CH4/N2 separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure  

作　　者：Hua Shang Yuping Li Jiaqi Liu Xuan Tang Jiangfeng Yang Jinping Li 

机构地区：[1]Research Institute of Special Chemicals,College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [3]Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan 030024,China

出　　处：《Chinese Journal of Chemical Engineering》2019年第5期1044-1049,共6页中国化学工程学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China (Nos. 51672186, 21676175)

摘　　要：Samples of methane molecules grade diameter channel CHA-type molecular sieves(Chabazite-K, SAPO-34 and SSZ-13) were investigated using the adsorption separation of CH4/N2 mixtures. The isotherms recorded for CH4 and N2 follow a typical type-Ι behavior, which were fitted well with the Sips model(R2>0.999) and the selectivity was calculated using IAST theory. The results reveal that Chabazite-K has the highest selectivity(SCH4/N= 5.5).2 SSZ-13 has the largest capacity, which can adsorb up to a maximum of 30.957 cm3·g-1(STP) of CH4, due to it having the largest pore volume and surface area, but the lowest selectivity(SCH4/N2= 2.5). From the breakthrough test, we can conclude that SSZ-13 may be a suitable candidate for the recovery of CH4 from low concentration methane(CH4<20%) based on its larger pore volume and higher CH4 capacity. Chabazite-K is more suited to the separation of high concentration methane(CH4>50%) due to its higher selectivity.Samples of methane molecules grade diameter channel CHA-type molecular sieves（Chabazite-K, SAPO-34 and SSZ-13） were investigated using the adsorption separation of CH4/N2 mixtures. The isotherms recorded for CH4 and N2 follow a typical type-Ι behavior, which were fitted well with the Sips model（R2>0.999） and the selectivity was calculated using IAST theory. The results reveal that Chabazite-K has the highest selectivity（SCH4/N= 5.5）.2 SSZ-13 has the largest capacity, which can adsorb up to a maximum of 30.957 cm3·g-1（STP） of CH4, due to it having the largest pore volume and surface area, but the lowest selectivity(SCH4/N2= 2.5). From the breakthrough test, we can conclude that SSZ-13 may be a suitable candidate for the recovery of CH4 from low concentration methane（CH4<20%） based on its larger pore volume and higher CH4 capacity. Chabazite-K is more suited to the separation of high concentration methane（CH4>50%） due to its higher selectivity.

关 键 词：Molecular SIEVES Adsorption CH4/N2 SEPARATION BREAKTHROUGH 

分 类 号：TQ[化学工程]