退火预处理对中空纤维炭膜结构和性能的影响  

Effect of annealing pretreatment on the structure and properties of carbon molecular sieve hollow fiber membranes

作　　者：张相龙 盛鲁杰 李晖 徐徜徉[3] 任吉中 ZHANG Xianglong;SHENG Lujie;LI Hui;XUChang yang;REN Jizhong(National Laboratory of Clean Energy,Dalian Institute of Chemical Physics,Dalian 116023,China;University of Chinese Academy of Sciences,Beijing 100049,China;National Engineering Research Center of Membrane Technology,Dalian 116023,China)

机构地区：[1]洁净能源国家实验室,大连化学物理研究所,大连116023 [2]中国科学院大学,北京100049 [3]膜技术国家工程研究中心,大连116023

出　　处：《膜科学与技术》2023年第4期110-117,共8页Membrane Science and Technology

基　　金：国家重点研发计划(2020YFC0862900)。

摘　　要：炭膜具有优异的热稳定性、化学稳定性和气体分离性能.以聚酰亚胺中空纤维膜为前驱体,经过Tg附近退火预处理(250、300和350℃),进而高温炭化制备高性能中空纤维炭膜,研究了预处理条件对炭膜结构和气体分离性能的影响.结果表明,当退火预处理温度升高时,中空纤维炭膜的结构更加致密,其CO_(2)/CH_(4)和H_(2)/CH_(4)选择性提高,气体通量下降.尤其是当退火预处理温度为350℃时,与未经预处理的中空纤维炭膜相比,其CO_(2)/CH_(4)和H_(2)/CH_(4)选择性分别提高了98%和195%.同时,研究了渗透温度和压力对气体分离性能的影响,采用HIM(氦离子电镜)、FTIR和XRD对中空纤维炭膜的结构进行了表征.Carbon membranes have excellent thermal stability,chemical stability and gas separation performance.In this study,polyimide hollow fiber membranes were used as precursors to prepare high performance carbon molecular sieve hollow fiber membranes by annealing pretreatment(250,300 and 350℃)near the Tg.The effects of annealing conditions on the structure and gas separation performance of polyimide-based carbon membranes were investigated.The results showed that the structure of carbon molecular sieve hollow fiber membranes became denser with the annealing temperature increasement,while the selectivity of CO_(2)/CH_(4)and H_(2)/CH_(4)increased and the permeability decreased.Especially when the annealing temperature was 350℃,the selectivity of CO_(2)/CH_(4)and H_(2)/CH_(4)increased by 98%and 195%,respectively.Simultaneously,the effects of permeation temperature and pressure on gas separation performance were studied.HIM(Helium ion electron microscope),FTIR and XRD were used to characterize the morphology of carbon membranes prepared under different pretreatment conditions.

关 键 词：中空纤维膜 炭膜 气体分离 聚酰亚胺 

分 类 号：TQ028.8[化学工程]