膜科学与技术

退火预处理对中空纤维炭膜结构和性能的影响

作者：张相龙，盛鲁杰，李晖，徐徜徉，任吉中

单位： 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

关键词：中空纤维膜；炭膜；气体分离；聚酰亚胺

出版年,卷(期):页码： 2023,43(4):110-117

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。本研究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CO2/CH4和H2/CH4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CO2/CH4和H2/CH4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表征。

s to prepare high performance carbon molecular sieve hollow fiber membranes by annealing pretreatment (250°C, 300°C and 350°C) 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 CO2/CH4 and H2/CH4 increased and the permeability decreased. Especially when the annealing temperature was 350℃, the selectivity of CO2/CH4 and H2/CH4 increased by 98% and 195%, respectively. Simultaneously, the effect of permeation temperature and pressure on gas separation performance was studied. HIM (Helium ion electron microscope), FTIR and XRD were used to characterize the morphology of carbon membranes prepared under different pretreatment conditions.

张相龙（1993-），山东高密人，硕士研究生，主要从事聚酰亚胺基炭膜的气体分离研究

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